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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
quant-ph/0610027 | Verstraete Frank | K.M.R. Audenaert, J. Calsamiglia, Ll. Masanes, R. Munoz-Tapia, A.
Acin, E. Bagan, F. Verstraete | The Quantum Chernoff Bound | null | Phys. Rev. Lett. 98, 160501 (2007) | 10.1103/PhysRevLett.98.160501 | null | quant-ph | null | We consider the problem of discriminating two different quantum states in the
setting of asymptotically many copies, and determine the optimal strategy that
minimizes the total probability of error. This leads to the identification of
the quantum Chernoff bound, thereby solving a long standing open problem. The
bound reduces to the classical Chernoff bound when the quantum states under
consideration commute. The quantum Chernoff bound is the natural symmetric
distance measure between quantum states because of its clear operational
meaning and because of the fact that it does not seem to share the undesirable
features of other distance measures like the fidelity, the trace norm and the
relative entropy.
| [
{
"version": "v1",
"created": "Wed, 4 Oct 2006 19:34:24 GMT"
}
]
| 2007-05-23T00:00:00 | [
[
"Audenaert",
"K. M. R.",
""
],
[
"Calsamiglia",
"J.",
""
],
[
"Masanes",
"Ll.",
""
],
[
"Munoz-Tapia",
"R.",
""
],
[
"Acin",
"A.",
""
],
[
"Bagan",
"E.",
""
],
[
"Verstraete",
"F.",
""
]
]
|
quant-ph/0610028 | Daniel A. Lidar | A. Shabani and D.A. Lidar (USC) | Quantum Error Correction Beyond Completely Positive Maps | This paper has been withdrawn as it has been superseded by
arXiv:0808.0175 and arXiv:0902.2478 | null | null | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By introducing an operator sum representation for arbitrary linear maps, we
develop a generalized theory of quantum error correction (QEC) that applies to
any linear map, in particular maps that are not completely positive (CP). This
theory of "linear quantum error correction" is applicable in cases where the
standard and restrictive assumption of a factorized initial system-bath state
does not apply.
| [
{
"version": "v1",
"created": "Thu, 5 Oct 2006 19:56:43 GMT"
},
{
"version": "v2",
"created": "Tue, 10 Oct 2006 17:02:36 GMT"
},
{
"version": "v3",
"created": "Thu, 18 Jan 2007 20:12:44 GMT"
},
{
"version": "v4",
"created": "Wed, 21 Oct 2009 20:24:57 GMT"
}
]
| 2009-10-21T00:00:00 | [
[
"Shabani",
"A.",
"",
"USC"
],
[
"Lidar",
"D. A.",
"",
"USC"
]
]
|
quant-ph/0610029 | Wenzhou Chen | W. Chen, D. Meiser, and P. Meystre | Cavity QED determination of atomic number statistics in optical lattices | 10 pages revtex, 13 figures | null | 10.1103/PhysRevA.75.023812 | null | quant-ph cond-mat.other physics.atom-ph | null | We study the reflection of two counter-propagating modes of the light field
in a ring resonator by ultracold atoms either in the Mott insulator state or in
the superfluid state of an optical lattice. We obtain exact numerical results
for a simple two-well model and carry out statistical calculations appropriate
for the full lattice case. We find that the dynamics of the reflected light
strongly depends on both the lattice spacing and the state of the matter-wave
field. Depending on the lattice spacing, the light field is sensitive to
various density-density correlation functions of the atoms. The light field and
the atoms become strongly entangled if the latter are in a superfluid state, in
which case the photon statistics typically exhibit complicated multimodal
structures.
| [
{
"version": "v1",
"created": "Thu, 5 Oct 2006 01:49:38 GMT"
},
{
"version": "v2",
"created": "Thu, 14 Dec 2006 22:55:23 GMT"
}
]
| 2015-06-26T00:00:00 | [
[
"Chen",
"W.",
""
],
[
"Meiser",
"D.",
""
],
[
"Meystre",
"P.",
""
]
]
|
quant-ph/0610030 | Stephen D. Bartlett | Stephen D. Bartlett, Terry Rudolph, and Robert W. Spekkens | Reference frames, superselection rules, and quantum information | 55 pages, published version | Rev. Mod. Phys. 79, 555 (2007) | 10.1103/RevModPhys.79.555 | null | quant-ph | null | Recently, there has been much interest in a new kind of ``unspeakable''
quantum information that stands to regular quantum information in the same way
that a direction in space or a moment in time stands to a classical bit string:
the former can only be encoded using particular degrees of freedom while the
latter are indifferent to the physical nature of the information carriers. The
problem of correlating distant reference frames, of which aligning Cartesian
axes and synchronizing clocks are important instances, is an example of a task
that requires the exchange of unspeakable information and for which it is
interesting to determine the fundamental quantum limit of efficiency. There
have also been many investigations into the information theory that is
appropriate for parties that lack reference frames or that lack correlation
between their reference frames, restrictions that result in global and local
superselection rules. In the presence of these, quantum unspeakable information
becomes a new kind of resource that can be manipulated, depleted, quantified,
etcetera. Methods have also been developed to contend with these restrictions
using relational encodings, particularly in the context of computation,
cryptography, communication, and the manipulation of entanglement. This article
reviews the role of reference frames and superselection rules in the theory of
quantum information processing.
| [
{
"version": "v1",
"created": "Thu, 5 Oct 2006 03:50:09 GMT"
},
{
"version": "v2",
"created": "Wed, 20 Dec 2006 03:11:45 GMT"
},
{
"version": "v3",
"created": "Tue, 10 Apr 2007 01:15:03 GMT"
}
]
| 2007-05-23T00:00:00 | [
[
"Bartlett",
"Stephen D.",
""
],
[
"Rudolph",
"Terry",
""
],
[
"Spekkens",
"Robert W.",
""
]
]
|
quant-ph/0610031 | William Hall | William Hall (University of York) | Compatibility of subsystem states and convex geometry | 12 pages APS format, some minor changes made | null | 10.1103/PhysRevA.75.032102 | null | quant-ph | null | The subsystem compatibility problem, which concerns the question of whether a
set of subsystem states are compatible with a state of the entire system, has
received much study. Here we attack the problem from a new angle, utilising the
ideas of convexity that have been successfully employed against the
separability problem. Analogously to an entanglement witness, we introduce the
idea of a compatibility witness, and prove a number of properties about these
objects. We show that the subsystem compatibility problem can be solved
numerically and efficiently using semidefinite programming, and that the
numerical results from this solution can be used to extract exact analytic
results, an idea which we use to disprove a conjecture about the subsystem
problem made by Butterley et al. [Found. Phys. 36 83 (2006)]. Finally, we
consider how the ideas can be used to tackle some important variants of the
compatibility problem; in particular, the case of identical particles (known as
N-representability in the case of fermions) is considered.
| [
{
"version": "v1",
"created": "Thu, 5 Oct 2006 10:46:22 GMT"
},
{
"version": "v2",
"created": "Thu, 4 Jan 2007 17:59:10 GMT"
}
]
| 2013-05-29T00:00:00 | [
[
"Hall",
"William",
"",
"University of York"
]
]
|
quant-ph/0610032 | Luis L. Sanchez. Soto | L. L. Sanchez-Soto, E. C. Yustas, G. Bjork, and A. B. Klimov | Maximally polarized states for quantum light fields | 4 pages, 3 eps-color figures | Phys. Rev. A 76, 043820 (2007) | 10.1103/PhysRevA.76.043820 | null | quant-ph | null | The degree of polarization of a quantum state can be defined as its
Hilbert-Schmidt distance to the set of unpolarized states. We demonstrate that
the states optimizing this degree for a fixed average number of photons
$\bar{N}$ present a fairly symmetric, parabolic photon statistics, with a
variance scaling as $\bar{N}^2$. Although no standard optical process yields
such a statistics, we show that, to an excellent approximation, a highly
squeezed vacuum can be considered as maximally polarized.
| [
{
"version": "v1",
"created": "Thu, 5 Oct 2006 13:28:19 GMT"
}
]
| 2008-07-25T00:00:00 | [
[
"Sanchez-Soto",
"L. L.",
""
],
[
"Yustas",
"E. C.",
""
],
[
"Bjork",
"G.",
""
],
[
"Klimov",
"A. B.",
""
]
]
|
quant-ph/0610033 | Nikolai Chuprikov | N. L. Chuprikov | Quantum mechanics and Leggett's principles of macroscopic realism | Latex, 8 pages; I welcome any comments on the paper | null | null | null | quant-ph | null | On the basis of our recent model of a one-dimensional (1D) completed
scattering we argue that Leggett's principles of macroscopic realism must and
can be extended onto the level of single electrons and atoms. These principles
need three quite feasible innovations in quantum mechanics (QM): (1) at the
conceptual level, QM must treat a pure time-dependent one-particle state to
involve two or more macroscopically distinct alternatives for a particle as a
pure {\it combined} one - the intermediate link between a pure {\it elementary}
state (indecomposable into macroscopically distinct parts) and statistical
mixture; (2) at the mathematical level, QM must provide the presentation of the
pure time-dependent combined state as a coherent superposition of
macroscopically distinct elementary states (MDESs); (3) at the experimental
level, QM must provide for such states two types of measurements - those for
observing the interference pattern resulting from the joint action of MDESs,
and non-demolishing 'which-way' measurements for scanning the individual
properties of MDESs.
| [
{
"version": "v1",
"created": "Thu, 5 Oct 2006 13:35:58 GMT"
},
{
"version": "v2",
"created": "Thu, 12 Oct 2006 08:38:05 GMT"
},
{
"version": "v3",
"created": "Thu, 21 Dec 2006 12:57:23 GMT"
},
{
"version": "v4",
"created": "Wed, 24 Jan 2007 14:57:02 GMT"
},
{
"version": "v5",
"created": "Fri, 23 Mar 2007 11:38:36 GMT"
}
]
| 2007-05-23T00:00:00 | [
[
"Chuprikov",
"N. L.",
""
]
]
|
quant-ph/0610034 | Atac Imamoglu | K. Hennessy, A. Badolato, M. Winger, D. Gerace, M. Atature, S. Gulde,
S. Falt, E. L. Hu, A. Imamoglu | Quantum nature of a strongly-coupled single quantum dot-cavity system | 14 pages 4 figures | null | 10.1038/nature05586 | null | quant-ph | null | Cavity quantum electrodynamics (QED) studies the interaction between a
quantum emitter and a single radiation-field mode. When an atom is in strong
coupling with a cavity mode1,2, it is possible to realize key quantum
information processing (QIP) tasks, such as controlled coherent coupling and
entanglement of distinguishable quantum systems. Realizing these tasks in the
solid state is clearly desirable, and coupling semiconductor self-assembled
quantum dots (QDs) to monolithic optical cavities is a promising route to this
end. However, validating the efficacy of QDs in QIP applications requires
confirmation of the quantum nature of the QD-cavity system in the strong
coupling regime. Here we find a confirmation by observing quantum correlations
in photoluminescence (PL) from a photonic crystal (PC) nanocavity3-5
interacting with one, and only one, QD located precisely at the cavity electric
field maximum. When off-resonance, photon emission from the cavity mode and QD
excitons is anti-correlated at the level of single quanta, proving that the
mode is driven solely by the QD despite an energy mis-match between cavity and
excitons. When tuned into resonance, the exciton and photon enter the
strong-coupling regime of cavity-QED and the QD lifetime reduces by a factor of
120. The photon stream from the cavity becomes anti-bunched, proving that the
coupled exciton/photon system is in the quantum anharmonic regime. Our
observations unequivocally show that QIP tasks requiring the quantum nonlinear
regime are achievable in the solid state.
| [
{
"version": "v1",
"created": "Thu, 5 Oct 2006 14:36:21 GMT"
}
]
| 2009-11-13T00:00:00 | [
[
"Hennessy",
"K.",
""
],
[
"Badolato",
"A.",
""
],
[
"Winger",
"M.",
""
],
[
"Gerace",
"D.",
""
],
[
"Atature",
"M.",
""
],
[
"Gulde",
"S.",
""
],
[
"Falt",
"S.",
""
],
[
"Hu",
"E. L.",
""
],
[
"Imamoglu",
"A.",
""
]
]
|
quant-ph/0610035 | Bin Wang | B. Wang and L.-M. Duan | Implementation of controlled SWAP gates for quantum fingerprinting and
photonic quantum computation | 4 pages | null | 10.1103/PhysRevA.75.050304 | null | quant-ph | null | We propose a scheme to implement quantum controlled SWAP gates by directing
single-photon pulses to a two-sided cavity with a single trapped atom. The
resultant gates can be used to realize quantum fingerprinting and universal
photonic quantum computation. The performance of the scheme is characterized
under realistic experimental noise with the requirements well within the reach
of the current technology.
| [
{
"version": "v1",
"created": "Thu, 5 Oct 2006 19:12:18 GMT"
},
{
"version": "v2",
"created": "Sun, 8 Oct 2006 20:04:34 GMT"
}
]
| 2009-11-13T00:00:00 | [
[
"Wang",
"B.",
""
],
[
"Duan",
"L. -M.",
""
]
]
|
quant-ph/0610036 | Odell Collins | O. A. Collins, S. D. Jenkins, A. Kuzmich, and T. A. B. Kennedy | Multiplexed Memory-Insensitive Quantum Repeaters | 5 pages, 4 figures. Accepted for publication in PRL | Physical Review Letters 98, 060502 (2007) | 10.1103/PhysRevLett.98.060502 | null | quant-ph | null | Long-distance quantum communication via distant pairs of entangled quantum
bits (qubits) is the first step towards more secure message transmission and
distributed quantum computing. To date, the most promising proposals require
quantum repeaters to mitigate the exponential decrease in communication rate
due to optical fiber losses. However, these are exquisitely sensitive to the
lifetimes of their memory elements. We propose a multiplexing of quantum nodes
that should enable the construction of quantum networks that are largely
insensitive to the coherence times of the quantum memory elements.
| [
{
"version": "v1",
"created": "Fri, 6 Oct 2006 18:53:57 GMT"
},
{
"version": "v2",
"created": "Tue, 23 Jan 2007 18:40:01 GMT"
}
]
| 2009-11-13T00:00:00 | [
[
"Collins",
"O. A.",
""
],
[
"Jenkins",
"S. D.",
""
],
[
"Kuzmich",
"A.",
""
],
[
"Kennedy",
"T. A. B.",
""
]
]
|
quant-ph/0610037 | Ireneusz Pakula | Ireneusz Pakula | Quantum gambling using mesoscopic ring qubits | 4 pages, 1 figure, poster during XXX Intern. Conf. of Theoretical
Physics, Electron correlations in nano- and microsystems, Ustron 9-14
September 2006. Minor corrections, references added; to appear in physica
status solidi b | null | 10.1002/pssb.200674643 | null | quant-ph | null | Quantum Game Theory provides us with new tools for practising games and some
other risk related enterprices like, for example, gambling. The two party
gambling protocol presented by Goldenberg {\it et al} is one of the simplest
yet still hard to implement applications of Quantum Game Theory. We propose
potential physical realisation of the quantum gambling protocol with use of
three mesoscopic ring qubits. We point out problems in implementation of such
game.
| [
{
"version": "v1",
"created": "Thu, 5 Oct 2006 21:31:36 GMT"
},
{
"version": "v2",
"created": "Tue, 17 Apr 2007 11:18:06 GMT"
}
]
| 2015-06-26T00:00:00 | [
[
"Pakula",
"Ireneusz",
""
]
]
|
quant-ph/0610038 | Martin Laforest | M. Laforest, D. Simon, J.-C. Boileau, J. Baugh, M. Ditty and R.
Laflamme | Using error correction to determine the noise model | 10 pages, 3 figures. Added discussion section, improved figures | PRA 75, 012331 (2007) | 10.1103/PhysRevA.75.012331 | null | quant-ph | null | Quantum error correcting codes have been shown to have the ability of making
quantum information resilient against noise. Here we show that we can use
quantum error correcting codes as diagnostics to characterise noise. The
experiment is based on a three-bit quantum error correcting code carried out on
a three-qubit nuclear magnetic resonance (NMR) quantum information processor.
Utilizing both engineered and natural noise, the degree of correlations present
in the noise affecting a two-qubit subsystem was determined. We measured a
correlation factor of c=0.5+/-0.2 using the error correction protocol, and
c=0.3+/-0.2 using a standard NMR technique based on coherence pathway
selection. Although the error correction method demands precise control, the
results demonstrate that the required precision is achievable in the
liquid-state NMR setting.
| [
{
"version": "v1",
"created": "Thu, 5 Oct 2006 23:21:02 GMT"
},
{
"version": "v2",
"created": "Thu, 25 Jan 2007 22:47:07 GMT"
}
]
| 2009-11-13T00:00:00 | [
[
"Laforest",
"M.",
""
],
[
"Simon",
"D.",
""
],
[
"Boileau",
"J. -C.",
""
],
[
"Baugh",
"J.",
""
],
[
"Ditty",
"M.",
""
],
[
"Laflamme",
"R.",
""
]
]
|
quant-ph/0610039 | Marin-Slobodan Tomas | M. S. Tomas | Medium effects on the van der Waals force | 6 pages, 4 figures, presented at Brijuni Conference X: Imaging in
Space and Time, Brijuni, Croatia, August 28 - September 01, 2006 | Phys. Rev. A 75, 012109 (2007) | 10.1103/PhysRevA.75.012109 | null | quant-ph | null | We consider the van der Waals interaction between two ground-state atoms
embedded in adjacent semi-infinite magnetodielectric media, with emphasis on
medium effects on it. We demonstrate that, in this case, at small atom-atom
distances the van der Waals interaction is screened by the surrounding media in
the same way as in an effective (single) medium. At larger atomic distances,
however, its dependence on the material parameters of the system and the
positions of the atoms is more complex. We also calculate the Casimir-Polder
potential of an atom A arising from a uniform distribution of atoms B in the
medium across the interface. Comparison of this potential with the
corresponding result deduced from the Casimir force on a thin composite slab in
front of a composite semi-infinite medium, both obeying the Clausius-Mossotti
relation, suggests a hint on how to improve a well-known formula for the van
der Waals potential with respect to the local-field effects.
| [
{
"version": "v1",
"created": "Fri, 6 Oct 2006 13:34:44 GMT"
}
]
| 2009-11-13T00:00:00 | [
[
"Tomas",
"M. S.",
""
]
]
|
quant-ph/0610040 | Maarten Van den Nest | M. Van den Nest, H. J. Briegel | Measurement-based quantum computation and undecidable logic | 10 pages. Presentation improved. Paper to appear in Found. Phys.;
currently published online | null | 10.1007/s10701-008-9212-6 | null | quant-ph | null | We establish a connection between measurement-based quantum computation and
the field of mathematical logic. We show that the computational power of an
important class of quantum states called graph states, representing resources
for measurement-based quantum computation, is reflected in the expressive power
of (classical) formal logic languages defined on the underlying mathematical
graphs. In particular, we show that for all graph state resources which can
yield a computational speed-up with respect to classical computation, the
underlying graphs--describing the quantum correlations of the states--are
associated with undecidable logic theories. Here undecidability is to be
interpreted in a sense similar to Goedel's incompleteness results, meaning that
there exist propositions, expressible in the above classical formal logic,
which cannot be proven or disproven.
| [
{
"version": "v1",
"created": "Fri, 6 Oct 2006 13:34:45 GMT"
},
{
"version": "v2",
"created": "Thu, 27 Mar 2008 21:00:54 GMT"
}
]
| 2008-03-28T00:00:00 | [
[
"Nest",
"M. Van den",
""
],
[
"Briegel",
"H. J.",
""
]
]
|
quant-ph/0610041 | Jens Timo Neumann | Gerhard C. Hegerfeldt, Jens Timo Neumann, Lawrence S. Schulman | Passage-time distributions from a spin-boson detector model | 11 pages, 6 figures; minor changes, references corrected; accepted
for publication in Phys. Rev. A | Physical Review A 75, 012108 (2007) | 10.1103/PhysRevA.75.012108 | null | quant-ph | null | The passage-time distribution for a spread-out quantum particle to traverse a
specific region is calculated using a detailed quantum model for the detector
involved. That model, developed and investigated in earlier works, is based on
the detected particle's enhancement of the coupling between a collection of
spins (in a metastable state) and their environment. We treat the continuum
limit of the model, under the assumption of the Markov property, and calculate
the particle state immediately after the first detection. An explicit example
with 15 boson modes shows excellent agreement between the discrete model and
the continuum limit. Analytical expressions for the passage-time distribution
as well as numerical examples are presented. The precision of the measurement
scheme is estimated and its optimization discussed. For slow particles, the
precision goes like $E^{-3/4}$, which improves previous $E^{-1}$ estimates,
obtained with a quantum clock model.
| [
{
"version": "v1",
"created": "Fri, 6 Oct 2006 13:59:51 GMT"
},
{
"version": "v2",
"created": "Thu, 16 Nov 2006 10:21:03 GMT"
}
]
| 2007-05-23T00:00:00 | [
[
"Hegerfeldt",
"Gerhard C.",
""
],
[
"Neumann",
"Jens Timo",
""
],
[
"Schulman",
"Lawrence S.",
""
]
]
|
quant-ph/0610042 | Antony Tambyrajah | Antony L Tambyrajah | Metric perturbation theory of quantum dynamics | null | null | null | null | quant-ph | null | A theory of quantum dynamics based on a discrete structure underlying the
space time manifold is developed for single particles. It is shown that at the
micro domain the interaction of particles with the underlying discrete
structure results in the quantum space time manifold. Regarding the resulting
quantum space-time as perturbation from the Lorentz metric it is shown it is
possible to discuss the dynamics of particles in the quantum domain.
| [
{
"version": "v1",
"created": "Fri, 6 Oct 2006 15:47:31 GMT"
}
]
| 2007-05-23T00:00:00 | [
[
"Tambyrajah",
"Antony L",
""
]
]
|
quant-ph/0610043 | Sandu Popescu | Sandu Popescu | KLM quantum computation with bosonic atoms | 3 pages, 1 figure | null | 10.1103/PhysRevLett.99.130503 | null | quant-ph | null | A Knill-Laflamme-Milburn (KLM) type quantum computation with bosonic neutral
atoms or bosonic ions is suggested. Crucially, as opposite to other quantum
computation schemes involving atoms (ions), no controlled interactions between
atoms (ions) involving their internal levels are required. Versus photonic KLM
computation this scheme has the advantage that single atom (ion) sources are
more natural than single photon sources, and single atom (ion) detectors are
far more efficient than single photon ones.
| [
{
"version": "v1",
"created": "Fri, 6 Oct 2006 15:57:24 GMT"
}
]
| 2013-05-29T00:00:00 | [
[
"Popescu",
"Sandu",
""
]
]
|
quant-ph/0610044 | Elias Griffith | E. J. Griffith, C. D. Hill, J. F. Ralph, H. M. Wiseman, Kurt Jacobs | Rapid state purification protocols for a Cooper pair box | 14 pages, 14 figures. v2: Revised version after referee comments.
Accepted for publication by Physical Review B | Phys. Rev. B 75, 014511 (2007) | 10.1103/PhysRevB.75.014511 | null | quant-ph cond-mat.supr-con | null | We propose techniques for implementing two different rapid state purification
schemes, within the constraints present in a superconducting charge qubit
system. Both schemes use a continuous measurement of charge (z) measurements,
and seek to minimize the time required to purify the conditional state. Our
methods are designed to make the purification process relatively insensitive to
rotations about the x-axis, due to the Josephson tunnelling Hamiltonian. The
first proposed method, based on the scheme of Jacobs [Phys. Rev. A 67,
030301(R) (2003)] uses the measurement results to control bias (z) pulses so as
to rotate the Bloch vector onto the x-axis of the Bloch sphere. The second
proposed method, based on the scheme of Wiseman and Ralph [New J. Phys. 8, 90
(2006)] uses a simple feedback protocol which tightly rotates the Bloch vector
about an axis almost parallel with the measurement axis. We compare the
performance of these and other techniques by a number of different measures.
| [
{
"version": "v1",
"created": "Fri, 6 Oct 2006 16:35:16 GMT"
},
{
"version": "v2",
"created": "Thu, 23 Nov 2006 16:25:44 GMT"
}
]
| 2007-05-23T00:00:00 | [
[
"Griffith",
"E. J.",
""
],
[
"Hill",
"C. D.",
""
],
[
"Ralph",
"J. F.",
""
],
[
"Wiseman",
"H. M.",
""
],
[
"Jacobs",
"Kurt",
""
]
]
|
quant-ph/0610045 | Wesley B. Cardoso | Iara P. de Queiros, W. B. Cardoso, and N. G. de Almeida | Superposition of coherent states prepared in one mode of a dissipative
bimodal cavity | 7 pages, 1 figure, submitted to J. Phys. B | J. Phys. B: At. Mol. Opt. Phys. 40 (2007) 21-27 | 10.1088/0953-4075/40/1/003 | null | quant-ph | null | We solve the problem of the temporal evolution of one of two-modes embedded
in a same dissipative environment and investigate the role of the losses after
the preparation of a coherent state in only one of the two modes. Based on
current cavity QED technology, we present a calculation of the fidelity of a
superposition of coherent states engineered in a bimodal high-Q cavity. Our
calculation demonstrates that the engineered superposition retains coherence
for large times when the mean photon number of the prepared mode is on the
order of unity.
| [
{
"version": "v1",
"created": "Fri, 6 Oct 2006 16:39:56 GMT"
}
]
| 2009-11-13T00:00:00 | [
[
"de Queiros",
"Iara P.",
""
],
[
"Cardoso",
"W. B.",
""
],
[
"de Almeida",
"N. G.",
""
]
]
|
quant-ph/0610046 | Mark P. Davidson | Mark P. Davidson | Stochastic Models of Quantum Mechanics - A Perspective | 15 pages. To appear in Proceedings of Foundations of Probability and
Physics, held at Vaxjo University, Sweden, June 4-9, 2006. Published by the
American Institute of Physics | null | 10.1063/1.2713450 | null | quant-ph | null | A subjective survey of stochastic models of quantum mechanics is given along
with a discussion of some key radiative processes, the clues they offer, and
the difficulties they pose for this program. An electromagnetic basis for
deriving quantum mechanics is advocated, and various possibilities are
considered. It is argued that only non-local or non-causal theories are likely
to be a successful basis for such a derivation.
| [
{
"version": "v1",
"created": "Fri, 6 Oct 2006 22:56:34 GMT"
}
]
| 2015-06-26T00:00:00 | [
[
"Davidson",
"Mark P.",
""
]
]
|
quant-ph/0610047 | Daegene Song | Daegene Song | Unsolvability of the Halting Problem in Quantum Dynamics | 4 pages, 3 figures | Int. J. Theor. Phys. 47, 1785 (2008) | 10.1007/s10773-007-9621-x | null | quant-ph | null | It is shown that the halting problem cannot be solved consistently in both
the Schrodinger and Heisenberg pictures of quantum dynamics. The existence of
the halting machine, which is assumed from quantum theory, leads into a
contradiction when we consider the case when the observer's reference frame is
the system that is to be evolved in both pictures. We then show that in order
to include the evolution of observer's reference frame in a physically sensible
way, the Heisenberg picture with time going backwards yields a correct
description.
| [
{
"version": "v1",
"created": "Sat, 7 Oct 2006 05:49:06 GMT"
}
]
| 2009-11-13T00:00:00 | [
[
"Song",
"Daegene",
""
]
]
|
quant-ph/0610048 | Joonwoo Bae | Joonwoo Bae and Antonio Acin | Key distillation from quantum channels using two-way communication
protocols | 21 pages | Phys. Rev. A 75, 012334 (2007) | 10.1103/PhysRevA.75.012334 | null | quant-ph | null | We provide a general formalism to characterize the cryptographic properties
of quantum channels in the realistic scenario where the two honest parties
employ prepare and measure protocols and the known two-way communication
reconciliation techniques. We obtain a necessary and sufficient condition to
distill a secret key using this type of schemes for Pauli qubit channels and
generalized Pauli channels in higher dimension. Our results can be applied to
standard protocols such as BB84 or six-state, giving a critical error rate of
20% and 27.6%, respectively. We explore several possibilities to enlarge these
bounds, without any improvement. These results suggest that there may exist
weakly entangling channels useless for key distribution using prepare and
measure schemes.
| [
{
"version": "v1",
"created": "Mon, 9 Oct 2006 17:36:42 GMT"
}
]
| 2010-09-23T00:00:00 | [
[
"Bae",
"Joonwoo",
""
],
[
"Acin",
"Antonio",
""
]
]
|
quant-ph/0610049 | Nilanjana Datta | Nilanjana Datta and Tony Dorlas | Coding Theorem for a Class of Quantum Channels with Long-Term Memory | Some typos corrected | null | 10.1088/1751-8113/40/28/S20 | null | quant-ph | null | In this paper we consider the transmission of classical information through a
class of quantum channels with long-term memory, which are given by convex
combinations of product channels. Hence, the memory of such channels is given
by a Markov chain which is aperiodic but not irreducible. We prove the coding
theorem and weak converse for this class of channels. The main techniques that
we employ, are a quantum version of Feinstein's Fundamental Lemma and a
generalization of Helstrom's Theorem.
| [
{
"version": "v1",
"created": "Sat, 7 Oct 2006 15:40:31 GMT"
},
{
"version": "v2",
"created": "Thu, 12 Oct 2006 14:56:40 GMT"
}
]
| 2009-11-13T00:00:00 | [
[
"Datta",
"Nilanjana",
""
],
[
"Dorlas",
"Tony",
""
]
]
|
quant-ph/0610050 | Da-Chuang Li | Da-Chuang Li, Zhuo-Liang Cao | Teleportation of two-particle entangled state via cluster state | six pages, no figure | Commun. Theor. Phys. 47, 464 (2007) | 10.1088/0253-6102/47/3/017 | null | quant-ph | null | We present two schemes for teleporting an unknown two-particle entangled
state from a sender (Alice) to a receiver (Bob) via a four-particle entangled
cluster state. As it is shown, the unknown two-particle entangled state can be
teleported perfectly, and the successful possibilities and fidelities of the
two schemes both reach unit.
| [
{
"version": "v1",
"created": "Sun, 8 Oct 2006 08:46:59 GMT"
}
]
| 2015-06-26T00:00:00 | [
[
"Li",
"Da-Chuang",
""
],
[
"Cao",
"Zhuo-Liang",
""
]
]
|
quant-ph/0610051 | Philip Davies | Philip Davies | A new link between Boson and Fermion algebras: an alternative to
supersymmetry | null | null | null | null | quant-ph | null | In this paper we describe a new family of algebras which in the case of n = 2
reduces to the Fermion algebra and in the limiting case of n tends to infinity
reduces to the Boson algebra. These generalized algebras describe particles
which obey a generalized exclusion principle, limiting state occupation to
(n-1) and obeying a generalized particle statistics.
| [
{
"version": "v1",
"created": "Sun, 8 Oct 2006 17:59:47 GMT"
}
]
| 2007-05-23T00:00:00 | [
[
"Davies",
"Philip",
""
]
]
|
quant-ph/0610052 | Andrei Khrennikov | Andrei Khrennikov, Guillaume Adenier, Theo M. Nieuwenhuizen | What are Quantum Fluctuations? Round Table of the Third Conference on
Quantum Theory: Reconsideration of Foundations | Proceedings of Conference Quantum Theory: Reconsideration of
Foundations-3, American Institute of Physics, Ser. Conference Proceedings,
Melville, NY, 2006, vol. 810 | null | null | null | quant-ph | null | This is a transcript of the round table that took place during the conference
Quantum Theory: Reconsideration of Foundations - 3, June 2005, Vaxjo, Sweden.
There are presented opinions of leading experts in quantum foundations on such
fundamental problems as the origin of quantum fluctuations and completeness of
quantum mechanics.
| [
{
"version": "v1",
"created": "Sun, 8 Oct 2006 18:21:48 GMT"
}
]
| 2007-05-23T00:00:00 | [
[
"Khrennikov",
"Andrei",
""
],
[
"Adenier",
"Guillaume",
""
],
[
"Nieuwenhuizen",
"Theo M.",
""
]
]
|
quant-ph/0610053 | Denis Brazhnikov V. | D.V. Brazhnikov, A.V. Taichenachev, A.M. Tumaikin, V.I. Yudin, S.A.
Zibrov, Ya.O. Dudin, V.V. Vasil'ev, V.L. Velichansky | Features of Magneto-Optical Resonances in an Elliptically Polarized
Traveling Light Wave | 5 pages | D.V. Brazhnikov, A.V. Taichenachev, A.M. Tumaikin, V.I. Yudin,
S.A. Zibrov, Ya.O. Dudin, V.V. Vasil'ev, V.L. Velichansky, JETP Lett. 83(2),
64-68 (2006) | 10.1134/S0021364006020044 | null | quant-ph | null | The parameters of nonlinear absorption magneto-optical resonances in the
Hanle configuration have been studied as functions of the ellipticity of a
traveling light wave. It has been found that these parameters (amplitude,
width, and amplitude-to-width ratio) depend strongly on the polarization of the
light wave. In particular, the resonance amplitude can increase by more than an
order of magnitude when the polarization changes from linear to optimal
elliptic. It has been shown that this effect is associated with the Doppler
frequency shift for atoms in a gas. The theoretical results have been
corroborated in experiments in Rb vapor.
| [
{
"version": "v1",
"created": "Mon, 9 Oct 2006 05:42:15 GMT"
}
]
| 2007-05-23T00:00:00 | [
[
"Brazhnikov",
"D. V.",
""
],
[
"Taichenachev",
"A. V.",
""
],
[
"Tumaikin",
"A. M.",
""
],
[
"Yudin",
"V. I.",
""
],
[
"Zibrov",
"S. A.",
""
],
[
"Dudin",
"Ya. O.",
""
],
[
"Vasil'ev",
"V. V.",
""
],
[
"Velichansky",
"V. L.",
""
]
]
|
quant-ph/0610054 | S N Sandhya | S N Sandhya | Effect of Atomic Coherence on Absorption in Four-level Systems: an
Analytical study | 15 pages 12 figures | null | 10.1088/0953-4075/40/5/002 | null | quant-ph | null | Absorption profile of a four-level ladder atomic system interacting with
three driving fields is studied perturbatively and analytical results are
presented. Numerical results where the driving field strengths are treated upto
all orders are presented. The absorption features is studied in two regimes, i)
the weak middle transition coupling, i.e.
$\Omega_2 << \Omega_{1,3}$ and ii) the strong middle transition coupling
$\Omega_2 >>\Omega_{1,3}$. In case i), it is shown that the ground state
absorption and the saturation characteristics of the population of level 2
reveal deviation due to the presence of upper level couplings. In particular,
the saturation curve for the population of level 2 shows a dip for $\Omega_1 =
\Omega_3$. While the populations of levels 3 and 4 show a maxima when this
resonance condition is satisfied. Thus the resonance condition provides a
criterion for maximally populating the upper levels. A second order
perturbation calculation reveals the nature of this minima (maxima). In the
second case, I report two important features: a) Filtering of the Aulter-Townes
doublet in the three-peak absorption profile of the ground state, which is
achieved by detuning only the upper most coupling field, and b) control of
line-width by controlling the strength of the upper coupling fields. This
filtering technique coupled with the control of linewidth could prove to be
very useful for high resolution studies.
| [
{
"version": "v1",
"created": "Mon, 9 Oct 2006 06:28:04 GMT"
}
]
| 2015-06-26T00:00:00 | [
[
"Sandhya",
"S N",
""
]
]
|
quant-ph/0610055 | Francesco Plastina | Tony J. G. Apollaro and Francesco Plastina | Entanglement localization by a single defect in a spin chain | null | Phys. Rev. A 74, 062316 (2006). | 10.1103/PhysRevA.74.062316 | null | quant-ph | null | We discuss the effect of a single diagonal defect on both the static and
dynamical properties of entanglement in a spin chain. We show that entanglement
localizes at the defect and discuss its localization length, arguing that this
can be used as a mean to store entanglement. We also show that the impurity
site can behave as an entanglement mirror and characterize the bouncing process
in terms of reflection and transmission coefficients.
| [
{
"version": "v1",
"created": "Mon, 9 Oct 2006 08:18:53 GMT"
}
]
| 2015-06-26T00:00:00 | [
[
"Apollaro",
"Tony J. G.",
""
],
[
"Plastina",
"Francesco",
""
]
]
|
quant-ph/0610056 | Etienne Brion | E. Brion, L.H. Pedersen and K. Molmer | Adiabatic Elimination in a Lambda System | 14 pages, 3 figures | null | 10.1088/1751-8113/40/5/011 | null | quant-ph | null | This paper deals with different ways to extract the effective two-dimensional
lower level dynamics of a lambda system excited by off-resonant laser beams. We
present a commonly used procedure for elimination of the upper level, and we
show that it may lead to ambiguous results. To overcome this problem and better
understand the applicability conditions of this scheme, we review two rigorous
methods which allow us both to derive an unambiguous effective two-level
Hamiltonian of the system and to quantify the accuracy of the approximation
achieved: the first one relies on the exact solution of the Schrodinger
equation, while the second one resorts to the Green's function formalism and
the Feshbach projection operator technique.
| [
{
"version": "v1",
"created": "Mon, 9 Oct 2006 10:47:06 GMT"
}
]
| 2015-06-26T00:00:00 | [
[
"Brion",
"E.",
""
],
[
"Pedersen",
"L. H.",
""
],
[
"Molmer",
"K.",
""
]
]
|
quant-ph/0610057 | Gian Paolo Beretta | Gian Paolo Beretta | The Hatsopoulos-Gyftopoulos resolution of the Schroedinger-Park paradox
about the concept of "state" in quantum statistical mechanics | RevTeX4, 7 pages, corrected a paragraph and added an example at page
3, to appear in Mod. Phys. Lett. A | Modern Physics Letters A, Vol.21, pp.2799-2811 (2006) | 10.1142/S0217732306021840 | null | quant-ph | null | A seldom recognized fundamental difficulty undermines the concept of
individual ``state'' in the present formulations of quantum statistical
mechanics (and in its quantum information theory interpretation as well). The
difficulty is an unavoidable consequence of an almost forgotten corollary
proved by E. Schroedinger in 1936 and perused by J.L. Park, Am. J. Phys., Vol.
36, 211 (1968). To resolve it, we must either reject as unsound the concept of
state, or else undertake a serious reformulation of quantum theory and the role
of statistics. We restate the difficulty and discuss a possible resolution
proposed in 1976 by G.N. Hatsopoulos and E.P. Gyftopoulos, Found. Phys., Vol.
6, 15, 127, 439, 561 (1976).
| [
{
"version": "v1",
"created": "Mon, 9 Oct 2006 11:36:16 GMT"
},
{
"version": "v2",
"created": "Mon, 16 Oct 2006 08:00:12 GMT"
}
]
| 2015-06-26T00:00:00 | [
[
"Beretta",
"Gian Paolo",
""
]
]
|
quant-ph/0610058 | Paolo Perinotti Dr. | Giacomo Mauro D'Ariano, Paolo Perinotti | Optimal data processing for quantum measurements | 4 pages, 1 figure, revtex4. Updated figure | Phys. Rev. Lett. 98, 020403 (2007). | 10.1103/PhysRevLett.98.020403 | null | quant-ph | null | We consider the general measurement scenario in which the ensemble average of
an operator is determined via suitable data-processing of the outcomes of a
quantum measurement described by a POVM. We determine the optimal processing
that minimizes the statistical error of the estimation.
| [
{
"version": "v1",
"created": "Mon, 9 Oct 2006 11:41:47 GMT"
},
{
"version": "v2",
"created": "Tue, 10 Oct 2006 12:15:14 GMT"
}
]
| 2007-05-23T00:00:00 | [
[
"D'Ariano",
"Giacomo Mauro",
""
],
[
"Perinotti",
"Paolo",
""
]
]
|
quant-ph/0610059 | Charles Hill | Charles Hill | Robust CNOT gates from almost any interaction | 5 pages, 2 figures | null | 10.1103/PhysRevLett.98.180501 | null | quant-ph | null | There are many cases where the interaction between two qubits is not
precisely known, but single qubit operations are available. In this paper we
show how, regardless of an incomplete knowledge of the strength or form of the
interaction between two qubits, it is often possible to construct a CNOT gate
which has arbitrarily high fidelity. In particular, we show that oscillations
in the strength of the exchange interaction in solid state Si and Ge structures
are correctable.
| [
{
"version": "v1",
"created": "Mon, 9 Oct 2006 15:08:32 GMT"
},
{
"version": "v2",
"created": "Thu, 12 Oct 2006 12:37:27 GMT"
}
]
| 2009-11-13T00:00:00 | [
[
"Hill",
"Charles",
""
]
]
|
quant-ph/0610060 | Zhengfeng Ji | Zhengfeng Ji, Guoming Wang, Runyao Duan, Yuan Feng and Mingsheng Ying | Parameter estimation of quantum channels | Final Version | IEEE Trans. Inf. Theory, Vol. 54, No. 11, 5172-5185, 2008 | 10.1109/TIT.2008.929940 | null | quant-ph | null | The efficiency of parameter estimation of quantum channels is studied in this
paper. We introduce the concept of programmable parameters to the theory of
estimation. It is found that programmable parameters obey the standard quantum
limit strictly; hence no speedup is possible in its estimation. We also
construct a class of non-unitary quantum channels whose parameter can be
estimated in a way that the standard quantum limit is broken. The study of
estimation of general quantum channels also enables an investigation of the
effect of noises on quantum estimation.
| [
{
"version": "v1",
"created": "Mon, 9 Oct 2006 15:11:12 GMT"
},
{
"version": "v2",
"created": "Mon, 23 Oct 2006 14:04:06 GMT"
},
{
"version": "v3",
"created": "Fri, 24 Aug 2007 12:06:27 GMT"
},
{
"version": "v4",
"created": "Thu, 15 Nov 2007 08:41:39 GMT"
}
]
| 2010-03-17T00:00:00 | [
[
"Ji",
"Zhengfeng",
""
],
[
"Wang",
"Guoming",
""
],
[
"Duan",
"Runyao",
""
],
[
"Feng",
"Yuan",
""
],
[
"Ying",
"Mingsheng",
""
]
]
|
quant-ph/0610061 | Thomas Schulte-Herbr\"uggen | T. Schulte-Herbrueggen and A. Spoerl | Which Quantum Evolutions Can Be Reversed by Local Unitary Operations?
Algebraic Classification and Gradient-Flow-Based Numerical Checks | 19 pages, 7 figures; comments welcome | null | null | null | quant-ph | null | Generalising in the sense of Hahn's spin echo, we completely characterise
those unitary propagators of effective multi-qubit interactions that can be
inverted solely by {\em local} unitary operations on $n$ qubits
(spins-$\tfrac{1}{2}$). The subset of $U\in \mathbf{SU}(2^n)$ satisfying
$U^{-1}=K_1 U K_2$ with pairs of local unitaries $K_1,
K_2\in\mathbf{SU}(2)^{\otimes n}$ comprises two classes: in type-I, $K_1$ and
$K_2$ are inverse to one another, while in type-II they are not. {Type-I}
consists of one-parameter groups that can jointly be inverted for all times
$t\in\R{}$ because their Hamiltonian generators satisfy $K H K^{-1} = \Ad K (H)
= -H$. As all the Hamiltonians generating locally invertible unitaries of
type-I are spanned by the eigenspace associated to the eigenvalue -1 of the
{\em local} conjugation map $\Ad K$, this eigenspace can be given in closed
algebraic form. The relation to the root space decomposition of
$\mathfrak{sl}(N,\C{})$ is pointed out. Special cases of type-I invertible
Hamiltonians are of $p$-quantum order and are analysed by the transformation
properties of spherical tensors of order $p$. Effective multi-qubit interaction
Hamiltonians are characterised via the graphs of their coupling topology.
{Type-II} consists of pointwise locally invertible propagators, part of which
can be classified according to the symmetries of their matrix representations.
Moreover, we show gradient flows for numerically solving the decision problem
whether a propagator is type-I or type-II invertible or not by driving the
least-squares distance $\norm{K_1 e^{-itH} K_2 - e^{+itH}}^2_2$ to zero.
| [
{
"version": "v1",
"created": "Mon, 9 Oct 2006 15:17:55 GMT"
}
]
| 2007-05-23T00:00:00 | [
[
"Schulte-Herbrueggen",
"T.",
""
],
[
"Spoerl",
"A.",
""
]
]
|
quant-ph/0610062 | Alessandro Villar | A. S. Villar, M. Martinelli, C. Fabre, and P. Nussenzveig | Direct Production of Tripartite Pump-Signal-Idler Entanglement in the
Above-Threshold Optical Parametric Oscillator | 4 pages, 3 figures | Phys Rev Lett 97,140504 (2006) | 10.1103/PhysRevLett.97.140504 | null | quant-ph | null | We calculate the quantum correlations existing among the three output fields
(pump, signal, and idler) of a triply resonant non-degenerate Optical
Parametric Oscillator operating above threshold. By applying the standard
criteria [P. van Loock and A. Furusawa, Phys. Rev. A 67, 052315 (2003)], we
show that strong tripartite continuous-variable entanglement is present in this
well-known and simple system. Furthermore, since the entanglement is generated
directly from a nonlinear process, the three entangled fields can have very
different frequencies, opening the way for multicolored quantum information
networks.
| [
{
"version": "v1",
"created": "Mon, 9 Oct 2006 17:00:17 GMT"
}
]
| 2007-05-23T00:00:00 | [
[
"Villar",
"A. S.",
""
],
[
"Martinelli",
"M.",
""
],
[
"Fabre",
"C.",
""
],
[
"Nussenzveig",
"P.",
""
]
]
|
quant-ph/0610063 | Panos Aliferis | Panos Aliferis and Andrew W. Cross | Subsystem fault tolerance with the Bacon-Shor code | 4 pages, 2 figures. v3: small revisions, appendix moved to chapter 5
in quant-ph/0703230 | Phys. Rev. Lett. 98 (2007) 220502 | 10.1103/PhysRevLett.98.220502 | null | quant-ph | null | We discuss how the presence of gauge sub-systems in the Bacon-Shor code [D.
Bacon, Phys. Rev. A 73, 012340 (2006)] leads to remarkably simple and efficient
methods for fault-tolerant error correction (FTEC). Most notably, FTEC does not
require entangled ancillary states and it can be implemented with
nearest-neighbor two-qubit measurements. By using these methods, we prove a
lower bound on the quantum accuracy threshold, 1.94 \times 10^{-4} for
adversarial stochastic noise, that improves previous lower bounds by nearly an
order of magnitude.
| [
{
"version": "v1",
"created": "Tue, 10 Oct 2006 19:40:12 GMT"
},
{
"version": "v2",
"created": "Sun, 14 Jan 2007 20:30:24 GMT"
},
{
"version": "v3",
"created": "Thu, 29 Mar 2007 00:48:54 GMT"
}
]
| 2007-06-13T00:00:00 | [
[
"Aliferis",
"Panos",
""
],
[
"Cross",
"Andrew W.",
""
]
]
|
quant-ph/0610064 | Ashton Bradley | A. S. Bradley, M. K. Olsen, S. A. Haine and J. J. Hope | Measuring the quantum statistics of an atom laser beam | 4 pages, 3 figures | Phys. Rev. A 76, 033603 (2007) | 10.1103/PhysRevA.76.033603 | null | quant-ph | null | We propose and analyse a scheme for measuring the quadrature statistics of an
atom laser beam using extant optical homodyning and Raman atom laser
techniques. Reversal of the normal Raman atom laser outcoupling scheme is used
to map the quantum statistics of an incoupled beam to an optical probe beam. A
multimode model of the spatial propagation dynamics shows that the Raman
incoupler gives a clear signal of de Broglie wave quadrature squeezing for both
pulsed and continuous inputs. Finally, we show that experimental realisations
of the scheme may be tested with existing methods via measurements of Glauber's
intensity correlation function.
| [
{
"version": "v1",
"created": "Tue, 10 Oct 2006 04:16:33 GMT"
}
]
| 2008-05-19T00:00:00 | [
[
"Bradley",
"A. S.",
""
],
[
"Olsen",
"M. K.",
""
],
[
"Haine",
"S. A.",
""
],
[
"Hope",
"J. J.",
""
]
]
|
quant-ph/0610065 | Francois Dubin | Francois Dubin, Daniel Rotter, Manas Mukherjee, Carlos Russo, Juergen
Eschner, and Rainer Blatt | Photon correlation vs interference of single-atom fluorescence in a
half-cavity | 4 pages, 3 figures | null | 10.1103/PhysRevLett.98.183003 | null | quant-ph | null | Photon correlations are investigated for a single laser-excited ion trapped
in front of a mirror. Varying the relative distance between the ion and the
mirror, photon correlation statistics can be tuned smoothly from an
antibunching minimum to a bunching-like maximum. Our analysis concerns the
non-Markovian regime of the ion-mirror interaction and reveals the field
establishment in a half-cavity interferometer.
| [
{
"version": "v1",
"created": "Tue, 10 Oct 2006 10:02:39 GMT"
}
]
| 2009-11-13T00:00:00 | [
[
"Dubin",
"Francois",
""
],
[
"Rotter",
"Daniel",
""
],
[
"Mukherjee",
"Manas",
""
],
[
"Russo",
"Carlos",
""
],
[
"Eschner",
"Juergen",
""
],
[
"Blatt",
"Rainer",
""
]
]
|
quant-ph/0610066 | Olivier Brunet | Olivier Brunet (Leibniz - IMAG) | A priori Knowledge and the Kochen-Specker Theorem | null | null | 10.1016/j.physleta.2006.12.062 | null | quant-ph | null | We introduce and formalize a notion of "a priori knowledge" about a quantum
system, and show some properties about this form of knowledge. Finally, we show
that the Kochen-Specker theorem follows directly from this study. This version
is a draft version, the bibliography in particular is extremely scarce.
Comments welcome.
| [
{
"version": "v1",
"created": "Tue, 10 Oct 2006 10:08:28 GMT"
},
{
"version": "v2",
"created": "Wed, 11 Oct 2006 12:45:13 GMT"
},
{
"version": "v3",
"created": "Thu, 9 Nov 2006 14:13:39 GMT"
}
]
| 2015-06-26T00:00:00 | [
[
"Brunet",
"Olivier",
"",
"Leibniz - IMAG"
]
]
|
quant-ph/0610067 | Fam Le Kien | Fam Le Kien, S. Dutta Gupta, and K. Hakuta | Optical excitation spectrum of an atom in a surface-induced potential | null | null | null | null | quant-ph | null | We study the optical excitation spectrum of an atom in the vicinity of a
dielectric surface. We calculate the rates of the total scattering and the
scattering into the evanescent modes. With a proper assessment of the
limitations, we demonstrate the portability of the flat-surface results to an
experimental situation with a nanofiber. The effect of the surface-induced
potential on the excitation spectrum for free-to-bound transitions is shown to
be weak. On the contrary, the effect for bound-to-bound transitions is
significant leading to a large excitation linewidth, a substantial negative
shift of the peak position, and a strong long tail on the negative side and a
small short tail on the positive side of the field--atom frequency detuning.
| [
{
"version": "v1",
"created": "Tue, 10 Oct 2006 10:27:15 GMT"
}
]
| 2007-05-23T00:00:00 | [
[
"Kien",
"Fam Le",
""
],
[
"Gupta",
"S. Dutta",
""
],
[
"Hakuta",
"K.",
""
]
]
|
quant-ph/0610068 | Fam Le Kien | Fam Le Kien and K. Hakuta | Spontaneous radiative decay of translational levels of an atom near a
dielectric surface | null | null | 10.1103/PhysRevA.75.013423 | null | quant-ph | null | We study spontaneous radiative decay of translational levels of an atom in
the vicinity of a semi-infinite dielectric. We systematically derive the
microscopic dynamical equations for the spontaneous decay process. We calculate
analytically and numerically the radiative linewidths and the spontaneous
transition rates for the translational levels. The roles of the interference
between the emitted and reflected fields and of the transmission into the
evanescent modes are clearly identified. Our numerical calculations for the
silica--cesium interaction show that the radiative linewidths of the bound
excited levels with large enough but not too large vibrational quantum numbers
are moderately enhanced by the emission into the evanescent modes and those for
the deep bound levels are substantially reduced by the surface-induced red
shift of the transition frequency.
| [
{
"version": "v1",
"created": "Tue, 10 Oct 2006 10:45:55 GMT"
}
]
| 2009-11-13T00:00:00 | [
[
"Kien",
"Fam Le",
""
],
[
"Hakuta",
"K.",
""
]
]
|
quant-ph/0610069 | Shao-Ming Fei | Bao-Zhi Sun, Shao-Ming Fei | Bell Inequalities Classifying Bi-separable Three-qubit States | 8 pages | Phys. Rev. A 74(2006)032335 | 10.1103/PhysRevA.74.032335 | null | quant-ph | null | We present a set of Bell inequalities that gives rise to a finer
classification of the entanglement for tripartite systems. These inequalities
distinguish three possible bi-separable entanglements for three-qubit states.
The three Bell operators we employed constitute an external sphere of the
separable cube.
| [
{
"version": "v1",
"created": "Tue, 10 Oct 2006 13:21:37 GMT"
}
]
| 2007-05-23T00:00:00 | [
[
"Sun",
"Bao-Zhi",
""
],
[
"Fei",
"Shao-Ming",
""
]
]
|
quant-ph/0610070 | Xiaoyu Chen | Xiao-yu Chen, Li-zhen Jiang, Ji-wu Chen | Simultaneous amplification and non-symmetric amplitude damping of
two-mode Gaussian state | 6 pages, 2 figures | null | 10.1016/j.physleta.2007.02.012 | null | quant-ph | null | The evolution of two-mode Gaussian state under symmetric amplification,
non-symmetric damping and thermal noise is studied. The time dependent solution
of the state characteristic function is obtained. The separability criterions
are given for the final state of weak amplification as well as strong
amplification.
| [
{
"version": "v1",
"created": "Tue, 10 Oct 2006 13:29:11 GMT"
}
]
| 2009-11-13T00:00:00 | [
[
"Chen",
"Xiao-yu",
""
],
[
"Jiang",
"Li-zhen",
""
],
[
"Chen",
"Ji-wu",
""
]
]
|
quant-ph/0610071 | Yvan Sortais | Y.R.P. Sortais, H. Marion, C. Tuchendler, A.M. Lance, M. Lamare, P.
Fournet, C. Armellin, R. Mercier, G. Messin, A. Browaeys and P. Grangier | Diffraction limited optics for single atom manipulation | 8 pages, 9 figures; typos corrected and references added | Phys. Rev. A 75, 013406 (2007) | 10.1103/PhysRevA.75.013406 | null | quant-ph | null | We present an optical system designed to capture and observe a single neutral
atom in an optical dipole trap, created by focussing a laser beam using a large
numerical aperture N.A.=0.5 aspheric lens. We experimentally evaluate the
performance of the optical system and show that it is diffraction limited over
a broad spectral range (~ 200 nm) with a large transverse field (+/- 25
microns). The optical tweezer created at the focal point of the lens is able to
trap single atoms of 87Rb and to detect them individually with a large
collection efficiency. We measure the oscillation frequency of the atom in the
dipole trap, and use this value as an independent determination of the waist of
the optical tweezer. Finally, we produce with the same lens two dipole traps
separated by 2.2 microns and show that the imaging system can resolve the two
atoms.
| [
{
"version": "v1",
"created": "Tue, 10 Oct 2006 13:37:15 GMT"
},
{
"version": "v2",
"created": "Thu, 23 Nov 2006 14:22:54 GMT"
}
]
| 2007-05-23T00:00:00 | [
[
"Sortais",
"Y. R. P.",
""
],
[
"Marion",
"H.",
""
],
[
"Tuchendler",
"C.",
""
],
[
"Lance",
"A. M.",
""
],
[
"Lamare",
"M.",
""
],
[
"Fournet",
"P.",
""
],
[
"Armellin",
"C.",
""
],
[
"Mercier",
"R.",
""
],
[
"Messin",
"G.",
""
],
[
"Browaeys",
"A.",
""
],
[
"Grangier",
"P.",
""
]
]
|
quant-ph/0610072 | Won-Ho Kye | Won-Ho Kye | Non-deterministic Two-Way Quantum Key Distribution using Coherent States | 4 pages, 2 figures; Protocol and Figure 1 updated | null | null | null | quant-ph | null | We propose a non-deterministic two-way quantum key distribution in which the
quantum correlation is established by transmitting the randomly polarized
photon. We analyze the security of the proposed quantum key distribution
against photon number splitting, impersonation, and Trojan horse attack and
quantify the security bound against mean photon number of the coherent state
pulse. Finally, we remark the characteristic features of the protocol.
| [
{
"version": "v1",
"created": "Tue, 10 Oct 2006 15:11:13 GMT"
},
{
"version": "v2",
"created": "Fri, 13 Oct 2006 11:36:13 GMT"
},
{
"version": "v3",
"created": "Mon, 5 Feb 2007 12:05:47 GMT"
},
{
"version": "v4",
"created": "Tue, 6 Mar 2007 14:55:17 GMT"
}
]
| 2007-05-23T00:00:00 | [
[
"Kye",
"Won-Ho",
""
]
]
|
quant-ph/0610073 | Igor B. Mekhov | Igor B. Mekhov, Christoph Maschler, Helmut Ritsch | Cavity enhanced light scattering in optical lattices to probe atomic
quantum statistics | 4 pages, 3 figures, to published in Phys. Rev. Lett. (March 2007) | Phys. Rev. Lett. 98, 100402 (2007) | 10.1103/PhysRevLett.98.100402 | null | quant-ph physics.atom-ph physics.optics | null | Different quantum states of atoms in optical lattices can be nondestructively
monitored by off-resonant collective light scattering into a cavity. Angle
resolved measurements of photon number and variance give information about
atom-number fluctuations and pair correlations without single-site access.
Observation at angles of diffraction minima provides information on quantum
fluctuations insensitive to classical noise. For transverse probing, no photon
is scattered into a cavity from a Mott insulator phase, while the photon number
is proportional to the atom number for a superfluid.
| [
{
"version": "v1",
"created": "Tue, 10 Oct 2006 15:32:15 GMT"
},
{
"version": "v2",
"created": "Tue, 27 Feb 2007 15:27:08 GMT"
}
]
| 2007-05-23T00:00:00 | [
[
"Mekhov",
"Igor B.",
""
],
[
"Maschler",
"Christoph",
""
],
[
"Ritsch",
"Helmut",
""
]
]
|
quant-ph/0610074 | Gregory Hutchinson | G. D. Hutchinson, C. A. Holmes, T. M. Stace, T. P. Spiller, G. J.
Milburn, S. D. Barrett, D. G. Hasko, and D. A. Williams | A Model for an Irreversible Bias Current in the Superconducting Qubit
Measurement Process | 42 pages and 7 figures | null | 10.1103/PhysRevA.74.062302 | null | quant-ph | null | The superconducting charge-phase `Quantronium' qubit is considered in order
to develop a model for the measurement process used in the experiment of Vion
et. al. [Science 296 886 (2002)]. For this model we propose a method for
including the bias current in the read-out process in a fundamentally
irreversible way, which to first order, is approximated by the Josephson
junction tilted-washboard potential phenomenology. The decohering bias current
is introduced in the form of a Lindblad operator and the Wigner function for
the current biased read-out Josephson junction is derived and analyzed. During
the read-out current pulse used in the Quantronium experiment we find that the
coherence of the qubit initially prepared in a symmetric superposition state is
lost at a time of 0.2 nanoseconds after the bias current pulse has been
applied. A timescale which is much shorter than the experimental readout time.
Additionally we look at the effect of Johnson-Nyquist noise with zero mean from
the current source during the qubit manipulation and show that the decoherence
due to the irreversible bias current description is an order of magnitude
smaller than that found through adding noise to the reversible tilted washboard
potential model. Our irreversible bias current model is also applicable to the
persistent current based qubits where the state is measured according to its
flux via a small inductance direct current superconducting quantum interference
device (DC-SQUID).
| [
{
"version": "v1",
"created": "Tue, 10 Oct 2006 15:34:51 GMT"
}
]
| 2009-11-13T00:00:00 | [
[
"Hutchinson",
"G. D.",
""
],
[
"Holmes",
"C. A.",
""
],
[
"Stace",
"T. M.",
""
],
[
"Spiller",
"T. P.",
""
],
[
"Milburn",
"G. J.",
""
],
[
"Barrett",
"S. D.",
""
],
[
"Hasko",
"D. G.",
""
],
[
"Williams",
"D. A.",
""
]
]
|
quant-ph/0610075 | Andrzej Deloff | A. Deloff | Quarkonium bound-state problem in momentum space revisited | Elsevier, 16 pages, no figures | AnnalsPhys.322:2315-2326,2007 | 10.1016/j.aop.2006.10.004 | null | quant-ph hep-ph | null | A semi-spectral Chebyshev method for solving numerically singular integral
equations is presented and applied in the quarkonium bound-state problem in
momentum space. The integrals containing both, logarithmic and Cauchy singular
kernels, can be evaluated without subtractions by dedicated automatic
quadratures.
By introducing a Chebyshev mesh and using the Nystrom algorithm the singular
integral equation is converted into an algebraic eigenvalue problem that can be
solved by standard methods.
The proposed scheme is very simple to use, is easy in programming and highly
accurate.
| [
{
"version": "v1",
"created": "Tue, 10 Oct 2006 17:00:38 GMT"
}
]
| 2016-09-08T00:00:00 | [
[
"Deloff",
"A.",
""
]
]
|
quant-ph/0610076 | Ariel Caticha | Ariel Caticha | From Objective Amplitudes to Bayesian Probabilities | 10 pages, 2 figures. Invited paper presented at the International
Conference on Foundations of Probability and Physics - 4 (Vaxjo University,
Sweden, 2006). The various versions reflect my attempts to include the
figures in the main body of the paper | null | 10.1063/1.2713447 | null | quant-ph | null | We review the Consistent Amplitude approach to Quantum Theory and argue that
quantum probabilities are explicitly Bayesian. In this approach amplitudes are
tools for inference. They codify objective information about how complicated
experimental setups are put together from simpler ones. Thus, probabilities may
be partially subjective but the amplitudes are not.
| [
{
"version": "v1",
"created": "Tue, 10 Oct 2006 17:55:52 GMT"
},
{
"version": "v2",
"created": "Tue, 10 Oct 2006 21:59:34 GMT"
},
{
"version": "v3",
"created": "Thu, 12 Oct 2006 17:54:44 GMT"
}
]
| 2015-06-26T00:00:00 | [
[
"Caticha",
"Ariel",
""
]
]
|
quant-ph/0610077 | Peter Morgan | Peter Morgan | Displacement deformed quantum fields | Relies on quant-ph/0512190. 12 pages. 2 figures | null | null | null | quant-ph | null | A displacement operator d_\zeta is introduced, verifying commutation
relations [d_\zeta, a_f^\dagger]=[d_\zeta, a_f]=\zeta(f)d_\zeta with field
creation and annihilation operators that verify [a_f,a_g]=0,
[a_f,a_g^\dagger]=(g,f), as usual. f and g are test functions, \zeta is a
Poincare invariant real-valued function on the test function space, and (g,f)
is a Poincare invariant Hermitian inner product. The *-algebra generated by all
these operators, and a state defined on it, nontrivially extends the *-algebra
of creation and annihilation operators and its Fock space representation. If
the usual requirement for linearity is weakened, as suggested in
quant-ph/0512190, we obtain a deformation of the free quantum field.
| [
{
"version": "v1",
"created": "Tue, 10 Oct 2006 18:03:12 GMT"
}
]
| 2007-05-23T00:00:00 | [
[
"Morgan",
"Peter",
""
]
]
|
quant-ph/0610078 | Enrique Solano | C.E. Lopez, H. Christ, J.C. Retamal, and E. Solano | Effective Quantum Dynamics of Interacting Systems with Inhomogeneous
Coupling | 9 pages and 10 figures, new version, accepted in Physical Review A | Phys. Rev. A 75, 033818 (2007) | 10.1103/PhysRevA.75.033818 | null | quant-ph cond-mat.mes-hall | null | We study the quantum dynamics of a single mode/particle interacting
inhomogeneously with a large number of particles and introduce an effective
approach to find the accessible Hilbert space where the dynamics takes place.
Two relevant examples are given: the inhomogeneous Tavis-Cummings model (e.g.,
N atomic qubits coupled to a single cavity mode, or to a motional mode in
trapped ions) and the inhomogeneous coupling of an electron spin to N nuclear
spins in a quantum dot.
| [
{
"version": "v1",
"created": "Tue, 10 Oct 2006 18:31:44 GMT"
},
{
"version": "v2",
"created": "Thu, 8 Mar 2007 22:31:43 GMT"
}
]
| 2015-06-26T00:00:00 | [
[
"Lopez",
"C. E.",
""
],
[
"Christ",
"H.",
""
],
[
"Retamal",
"J. C.",
""
],
[
"Solano",
"E.",
""
]
]
|
quant-ph/0610079 | P. Narayana Swamy | P. Narayana Swamy | Generalized Heisenberg relation and Quantum Harmonic Oscillators | 10 pages, LaTeX | null | 10.1142/S0217751X06034458 | null | quant-ph | null | We study the consequences of the generalized Heisenberg uncertainty relation
which admits a minimal uncertainty in length such as the case in a theory of
quantum gravity. In particular, the theory of quantum harmonic oscillators
arising from such a generalized uncertainty relation is examined. We
demonstrate that all the standard properties of the quantum harmonic
oscillators prevail when we employ a generalized momentum. We also show that
quantum electrodynamics and coherent photon states can be described in the
familiar standard manner despite the generalized uncertainty principle.
| [
{
"version": "v1",
"created": "Tue, 10 Oct 2006 18:39:51 GMT"
}
]
| 2015-06-26T00:00:00 | [
[
"Swamy",
"P. Narayana",
""
]
]
|
quant-ph/0610080 | Jean-Pierre Gazeau | Jean-Pierre Gazeau (APC), Eric Huguet (APC), Marc Lachi\`eze-Rey
(APC), Jacques Renaud (APC) | Fuzzy spheres from inequivalent coherent states quantizations | 20 pages | Journal of Physics A: Mathematical and Theoretical 40 (2007)
10225-10249 | 10.1088/1751-8113/40/33/018 | null | quant-ph | null | We present a new procedure which allows a coherent state (CS) quantization of
any set with a measure. It is manifest through the replacement of classical
observables by CS quantum observables, which acts on a Hilbert space of
prescribed dimension $N$. The algebra of CS quantum observables has the finite
dimension $N^2$. The application to the 2-sphere provides a family of
inequivalent CS quantizations, based on the spin spherical harmonics (the CS
quantization from usual spherical harmonics appears to give a trivial issue for
the cartesian coordinates). We compare these CS quantizations to the usual
(Madore) construction of the fuzzy sphere. The difference allows us to consider
our procedures as the constructions of new type of fuzzy spheres. The very
general character of our method suggests applications to construct fuzzy
versions of a variety of sets.
| [
{
"version": "v1",
"created": "Tue, 10 Oct 2006 18:59:16 GMT"
}
]
| 2012-02-27T00:00:00 | [
[
"Gazeau",
"Jean-Pierre",
"",
"APC"
],
[
"Huguet",
"Eric",
"",
"APC"
],
[
"Lachièze-Rey",
"Marc",
"",
"APC"
],
[
"Renaud",
"Jacques",
"",
"APC"
]
]
|
quant-ph/0610081 | George Svetlichny | George Svetlichny | Teleporting a qubit a la Everett | 3 new references and related remarks. 7 pages | null | null | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If both Alice and Bob have access to a two-qubit "background state" then, by
simulating Everett's many worlds interpretation of measurement, Alice can
teleport a qubit to Bob, each using fixed unitaries. The Everett picture
unifies unitaries, measurements, and classical communication into just
unitaries, provided there are background states shared by all parties. We
review some of the literature on this theme and point out an additional fact:
If Bob has access to only one of the background qubits, teleportation is still
possible by Alice sending Bob one classical bit of information gained from a
measurement of the other qubit.
| [
{
"version": "v1",
"created": "Tue, 10 Oct 2006 19:28:16 GMT"
},
{
"version": "v2",
"created": "Tue, 27 Feb 2007 16:55:28 GMT"
},
{
"version": "v3",
"created": "Sun, 24 Mar 2013 17:07:19 GMT"
}
]
| 2013-03-26T00:00:00 | [
[
"Svetlichny",
"George",
""
]
]
|
quant-ph/0610082 | Robert Raussendorf | Robert Raussendorf and Jim Harrington | Fault-tolerant quantum computation with high threshold in two dimensions | 4 pages, 4 figures; v2: A single 2D layer of qubits (simple square
lattice) with nearest-neighbor translation-invariant Ising interaction
suffices. Slightly improved threshold | Phys. Rev. Lett. 98, 190504 (2007) | 10.1103/PhysRevLett.98.190504 | LA-UR-06-7158 | quant-ph | null | We present a scheme of fault-tolerant quantum computation for a local
architecture in two spatial dimensions. The error threshold is 0.75% for each
source in an error model with preparation, gate, storage and measurement
errors.
| [
{
"version": "v1",
"created": "Wed, 11 Oct 2006 02:12:00 GMT"
},
{
"version": "v2",
"created": "Mon, 14 May 2007 18:30:24 GMT"
}
]
| 2007-05-23T00:00:00 | [
[
"Raussendorf",
"Robert",
""
],
[
"Harrington",
"Jim",
""
]
]
|
quant-ph/0610083 | Mang Feng | M. Feng, G.J. Dong and B. Hu | The readout of the fullerene-based quantum computing by a scanning
tunneling microscope | RevTex file, 3 figures. To appear in New Journal of Physics | null | 10.1088/1367-2630/8/10/252 | null | quant-ph | null | We consider to detect the electron spin of a doped atom, i.e., a nitrogen or
a phosphorus, caged in a fullerene by currently available technique of the
scanning tunneling microscope (STM), which actually corresponds to the readout
of a qubit in the fullerene-based quantum computing. Under the conditions of
polarized STM current and Coulomb blockade, we investigate the tunneling matrix
elements involving the exchange coupling between the tunneling polarized
electrons and the encapsulated polarized electron, and calculate the variation
of the tunneling current with respect to different orientations of the
encapsulated electron spin. The experimental feasibility of our scheme is
discussed under the consideration of some imperfect factors.
| [
{
"version": "v1",
"created": "Wed, 11 Oct 2006 01:01:04 GMT"
}
]
| 2009-11-13T00:00:00 | [
[
"Feng",
"M.",
""
],
[
"Dong",
"G. J.",
""
],
[
"Hu",
"B.",
""
]
]
|
quant-ph/0610084 | Adrian Paul Flitney | Adrian P. Flitney and Lloyd C. L. Hollenberg | Nash equilibria in quantum games with generalized two-parameter
strategies | 19 pages, 2 eps figures | Phys. Lett. A 363 (2007) 381-388 | 10.1016/j.physleta.2006.11.044 | null | quant-ph | null | In the Eisert protocol for 2 X 2 quantum games [Phys. Rev. Lett. 83, 3077], a
number of authors have investigated the features arising from making the
strategic space a two-parameter subset of single qubit unitary operators. We
argue that the new Nash equilibria and the classical-quantum transitions that
occur are simply an artifact of the particular strategy space chosen. By
choosing a different, but equally plausible, two-parameter strategic space we
show that different Nash equilibria with different classical-quantum
transitions can arise. We generalize the two-parameter strategies and also
consider these strategies in a multiplayer setting.
| [
{
"version": "v1",
"created": "Wed, 11 Oct 2006 02:17:37 GMT"
}
]
| 2009-11-13T00:00:00 | [
[
"Flitney",
"Adrian P.",
""
],
[
"Hollenberg",
"Lloyd C. L.",
""
]
]
|
quant-ph/0610085 | Ashley Montanaro | Ashley Montanaro and Andreas Winter | A lower bound on entanglement-assisted quantum communication complexity | 10 pages; v2 adds references and fixes typos | In Proc. ICALP'07, 2007 | null | null | quant-ph | null | We prove a general lower bound on the bounded-error entanglement-assisted
quantum communication complexity of Boolean functions. The bound is based on
the concept that any classical or quantum protocol to evaluate a function on
distributed inputs can be turned into a quantum communication protocol. As an
application of this bound, we give a very simple proof of the statement that
almost all Boolean functions on n+n bits have linear communication complexity,
even in the presence of unlimited entanglement.
| [
{
"version": "v1",
"created": "Wed, 11 Oct 2006 08:03:32 GMT"
},
{
"version": "v2",
"created": "Thu, 19 Oct 2006 12:47:02 GMT"
}
]
| 2011-11-09T00:00:00 | [
[
"Montanaro",
"Ashley",
""
],
[
"Winter",
"Andreas",
""
]
]
|
quant-ph/0610086 | Yu Chang-shui | Chang-shui Yu, and He-shan Song | Generalized Bell inequality for mixed states with variable constraints | 5 pages and 3 figures, Comments and suggestion are expected and
welcome | null | null | null | quant-ph | null | In this paper, we present a generalized Bell inequality for mixed states. The
distinct characteristic is that the inequality has variable bound depending on
the decomposition of the density matrix. The inequality has been shown to be
more refined than the previous Bell inequality. It is possible that a separable
mixed state can violate the Bell inequality.
| [
{
"version": "v1",
"created": "Wed, 11 Oct 2006 08:19:14 GMT"
}
]
| 2007-05-23T00:00:00 | [
[
"Yu",
"Chang-shui",
""
],
[
"Song",
"He-shan",
""
]
]
|
quant-ph/0610087 | Matthew Jones | Benoit Darqui\'e (LCFIO), Matthew Jones (LCFIO), Jos Dingjan (LCFIO),
Jerome Beugnon (LCFIO), Silvia Bergamini (LCFIO), Yvan Sortais (LCFIO),
Gaetan Messin (LCFIO), Antoine Browaeys (LCFIO), Philippe Grangier (LCFIO) | Controlled Single-Photon Emission from a Single Trapped Two-Level Atom | null | Science 309 (2005) 454 | 10.1126/science.1113394 | null | quant-ph | null | By illuminating an individual rubidium atom stored in a tight optical tweezer
with short resonant light pulses, we create an efficient triggered source of
single photons with a well-defined polarization. The measured intensity
correlation of the emitted light pulses exhibits almost perfect antibunching.
Such a source of high rate, fully controlled single photon pulses has many
potential applications for quantum information processing.
| [
{
"version": "v1",
"created": "Wed, 11 Oct 2006 09:45:06 GMT"
}
]
| 2016-08-16T00:00:00 | [
[
"Darquié",
"Benoit",
"",
"LCFIO"
],
[
"Jones",
"Matthew",
"",
"LCFIO"
],
[
"Dingjan",
"Jos",
"",
"LCFIO"
],
[
"Beugnon",
"Jerome",
"",
"LCFIO"
],
[
"Bergamini",
"Silvia",
"",
"LCFIO"
],
[
"Sortais",
"Yvan",
"",
"LCFIO"
],
[
"Messin",
"Gaetan",
"",
"LCFIO"
],
[
"Browaeys",
"Antoine",
"",
"LCFIO"
],
[
"Grangier",
"Philippe",
"",
"LCFIO"
]
]
|
quant-ph/0610088 | Dave Bacon | Dave Bacon and Andrea Casaccino | Quantum Error Correcting Subsystem Codes From Two Classical Linear Codes | 8 pages, Allerton 2006 conference. Last name fixed | null | null | null | quant-ph | null | The essential insight of quantum error correction was that quantum
information can be protected by suitably encoding this quantum information
across multiple independently erred quantum systems. Recently it was realized
that, since the most general method for encoding quantum information is to
encode it into a subsystem, there exists a novel form of quantum error
correction beyond the traditional quantum error correcting subspace codes.
These new quantum error correcting subsystem codes differ from subspace codes
in that their quantum correcting routines can be considerably simpler than
related subspace codes. Here we present a class of quantum error correcting
subsystem codes constructed from two classical linear codes. These codes are
the subsystem versions of the quantum error correcting subspace codes which are
generalizations of Shor's original quantum error correcting subspace codes. For
every Shor-type code, the codes we present give a considerable savings in the
number of stabilizer measurements needed in their error recovery routines.
| [
{
"version": "v1",
"created": "Wed, 11 Oct 2006 11:56:17 GMT"
},
{
"version": "v2",
"created": "Tue, 17 Oct 2006 21:48:49 GMT"
}
]
| 2007-05-23T00:00:00 | [
[
"Bacon",
"Dave",
""
],
[
"Casaccino",
"Andrea",
""
]
]
|
quant-ph/0610089 | Mehrdad Ghominejad | Shilan Savan, Mehrdad Ghominejad | Possible considerations to teleport fermionic particles via studying on
teleportation of two-particle state with a four fermionic-particle pure
entangled state | 4 pages, poster presented at IPM-LHP06, Tehran, Iran; PSN:
IPM-LHP06-19May | ECONFC0605151:0027,2006 | null | null | quant-ph | null | In this paper we have firstly recapped some evolutionary debates on
conceptual quantum information matters, followed by an experiment done by
Lamei-Rashti and his collaborator, by which the bell inequality on p-p
scattering is violated. We then, by using the goal of his experiment, thought
to arrange POVM formalism for a possible teleportation of two particle states,
via nuclear magnetic spin of four entangled hydrogen like atoms.
| [
{
"version": "v1",
"created": "Wed, 11 Oct 2006 12:03:21 GMT"
}
]
| 2008-11-26T00:00:00 | [
[
"Savan",
"Shilan",
""
],
[
"Ghominejad",
"Mehrdad",
""
]
]
|
quant-ph/0610090 | Alessio Serafini | Alessio Serafini, Oscar C.O. Dahlsten, and Martin B. Plenio | Teleportation fidelities of squeezed states from thermodynamical state
space measures | 4 pages + 1 figure (not included in journal version) | Phys. Rev. Lett. 98, 170501 (2007) | 10.1103/PhysRevLett.98.170501 | null | quant-ph | null | We introduce a "microcanonical" measure (complying with the "general
canonical principle") over the second moments of pure bosonic Gaussian states
under an energy constraint. We determine the average fidelity for the
teleportation of states distributed according to such a measure and compare it
to a threshold obtained from a feasible classical strategy. Furthermore, we
show that, under the proposed measure, the distribution of the entanglement
concentrates around a finite value at the thermodynamical limit and, in
general, the typical entanglement of Gaussian states with maximal energy E is
not close to the maximum allowed by E.
| [
{
"version": "v1",
"created": "Wed, 11 Oct 2006 14:41:08 GMT"
},
{
"version": "v2",
"created": "Mon, 9 Apr 2007 13:56:40 GMT"
},
{
"version": "v3",
"created": "Fri, 18 May 2007 19:51:52 GMT"
}
]
| 2007-05-23T00:00:00 | [
[
"Serafini",
"Alessio",
""
],
[
"Dahlsten",
"Oscar C. O.",
""
],
[
"Plenio",
"Martin B.",
""
]
]
|
quant-ph/0610091 | Luis Benet | L. Benet, L. T. Chadderton, S. Yu. Kun, Wang Qi | Quantum-classical transition for an analog of double-slit experiment in
complex collisions: Dynamical decoherence in quantum many-body systems | 5 pages, 2 ps color figures. Accepted for publication in Phys. Rev. A | Phys. Rev. A 75 (2007), 062110 | 10.1103/PhysRevA.75.062110 | null | quant-ph physics.atom-ph physics.chem-ph | null | We study coherent superpositions of clockwise and anti-clockwise rotating
intermediate complexes with overlapping resonances formed in bimolecular
chemical reactions. Disintegration of such complexes represents an analog of
famous double-slit experiment. The time for disappearance of the interference
fringes is estimated from heuristic arguments related to fingerprints of
chaotic dynamics of a classical counterpart of the coherently rotating complex.
Validity of this estimate is confirmed numerically for the H+D$_2$ chemical
reaction. Thus we demonstrate the quantum--classical transition in temporal
behavior of highly excited quantum many-body systems in the absence of external
noise and coupling to an environment.
| [
{
"version": "v1",
"created": "Wed, 11 Oct 2006 22:18:47 GMT"
},
{
"version": "v2",
"created": "Thu, 3 May 2007 16:44:39 GMT"
}
]
| 2007-08-30T00:00:00 | [
[
"Benet",
"L.",
""
],
[
"Chadderton",
"L. T.",
""
],
[
"Kun",
"S. Yu.",
""
],
[
"Qi",
"Wang",
""
]
]
|
quant-ph/0610092 | Minhsiu Hsieh | Todd Brun, Igor Devetak, Min-Hsiu Hsieh | Correcting Quantum Errors with Entanglement | 17 pages, no figure. To appear in Science | Science 314, 436-439 (2006). | 10.1126/science.1131563 | null | quant-ph | null | We show how entanglement shared between encoder and decoder can simplify the
theory of quantum error correction. The entanglement-assisted quantum codes we
describe do not require the dual-containing constraint necessary for standard
quantum error correcting codes, thus allowing us to ``quantize'' all of
classical linear coding theory. In particular, efficient modern classical codes
that attain the Shannon capacity can be made into entanglement-assisted quantum
codes attaining the hashing bound (closely related to the quantum capacity).
For systems without large amounts of shared entanglement, these codes can also
be used as catalytic codes, in which a small amount of initial entanglement
enables quantum communication.
| [
{
"version": "v1",
"created": "Wed, 11 Oct 2006 23:46:37 GMT"
}
]
| 2007-05-23T00:00:00 | [
[
"Brun",
"Todd",
""
],
[
"Devetak",
"Igor",
""
],
[
"Hsieh",
"Min-Hsiu",
""
]
]
|
quant-ph/0610093 | Timothy C. Ralph | T.C.Ralph | A Model for Non-Linear Quantum Evolution based on Time Displaced
Entanglement | null | Proc. SPIE 6305, 63050P (2006) | 10.1117/12.680097 | null | quant-ph | null | We discuss a model for non-linear quantum evolution based on the idea of time
displaced entanglement, produced by taking one member of an entangled pair on a
round trip at relativistic speeds, thus inducing a time-shift between the pair.
We show that decoherence of the entangled pair is predicted. For non-maximal
entanglement this then implies the ability to induce a non-unitary, non-linear
quantum evolution. Although exhibiting unusual characteristics, we show that
these evolutions cannot be dismissed on the basis of entropic or causal
arguments.
| [
{
"version": "v1",
"created": "Thu, 12 Oct 2006 04:01:06 GMT"
}
]
| 2009-11-13T00:00:00 | [
[
"Ralph",
"T. C.",
""
]
]
|
quant-ph/0610094 | Galina L. Klimchitskaya | F. Chen, G.L. Klimchitskaya, V.M. Mostepanenko, and U. Mohideen | Demonstration of optically modulated dispersion forces | 7 pages, 3 figures, opex3.sty is used, text has been made in
accordance with the final version to appear in Optics express, 3 misprints
are corrected | Optics Express, vol.15, No.8, p.4823-4829 (2007) | 10.1364/OE.15.004823 | null | quant-ph cond-mat.other | null | We report the first experiment on the optical modulation of dispersion forces
through a change of the carrier density in a Si membrane. For this purpose a
high-vacuum based atomic force microscope and excitation light pulses from an
Ar laser are used. The experimental results are compared with two theoretical
models. The modulation of the dispersion force will find applications in
optomechanical micromachines.
| [
{
"version": "v1",
"created": "Thu, 12 Oct 2006 07:34:55 GMT"
},
{
"version": "v2",
"created": "Thu, 5 Apr 2007 19:40:52 GMT"
}
]
| 2009-11-13T00:00:00 | [
[
"Chen",
"F.",
""
],
[
"Klimchitskaya",
"G. L.",
""
],
[
"Mostepanenko",
"V. M.",
""
],
[
"Mohideen",
"U.",
""
]
]
|
quant-ph/0610095 | Edward Hinds | Stefan Scheel, E. A. Hinds, and P. L. Knight | Comment on `Spin Decoherence in Superconducting Atom Chips' | 1 page comment | null | null | null | quant-ph | null | We comment on a recent paper [Phys. Rev. Lett. 97, 070401 (2006):
quant-ph/0603229] concerning rubidium atoms trapped near a superconducting
niobium surface at ~4K. This seeks to calculate the rate of atomic spin flips
induced by thermal magnetic noise. We point out that the calculation is in
error by a large factor because it is based on the two-fluid model of
superconductivity. This model gives a poor description of electromagnetic
dissipation just below the critical temperature because it cannot incorporate
the case II coherences of a fuller quantum theory.
| [
{
"version": "v1",
"created": "Thu, 12 Oct 2006 09:41:52 GMT"
},
{
"version": "v2",
"created": "Thu, 12 Oct 2006 20:46:12 GMT"
}
]
| 2007-05-23T00:00:00 | [
[
"Scheel",
"Stefan",
""
],
[
"Hinds",
"E. A.",
""
],
[
"Knight",
"P. L.",
""
]
]
|
quant-ph/0610096 | Xiaofan Mo | Xiao-Fan Mo, Tao Zhang, Fang-Xing Xu, Zheng-Fu Han, and Guang-Can Guo | Quantum key distribution network with wavelength addressing | 11 pages, 3 figures | null | null | null | quant-ph | null | Most traditional applications of quantum cryptography are point-to-point
communications, in which only two users can exchange keys. In this letter, we
present a network scheme that enable quantum key distribution between
multi-user with wavelength addressing. Considering the current state of
wavelength division multiplexing technique, dozens or hundreds of users can be
connected to such a network and directly exchange keys with each other. With
the scheme, a 4-user demonstration network was built up and key exchanges were
performed.
| [
{
"version": "v1",
"created": "Thu, 12 Oct 2006 12:44:30 GMT"
},
{
"version": "v2",
"created": "Sun, 15 Oct 2006 03:13:39 GMT"
}
]
| 2007-05-23T00:00:00 | [
[
"Mo",
"Xiao-Fan",
""
],
[
"Zhang",
"Tao",
""
],
[
"Xu",
"Fang-Xing",
""
],
[
"Han",
"Zheng-Fu",
""
],
[
"Guo",
"Guang-Can",
""
]
]
|
quant-ph/0610097 | Anthony J. Short | Noah Linden, Sandu Popescu, Anthony J. Short, Andreas Winter | No quantum advantage for nonlocal computation | 4 pages | Phys. Rev. Lett. 99:180502, 2007 | 10.1103/PhysRevLett.99.180502 | null | quant-ph | null | We investigate the problem of "nonlocal" computation, in which separated
parties must compute a function with nonlocally encoded inputs and output, such
that each party individually learns nothing, yet together they compute the
correct function output. We show that the best that can be done classically is
a trivial linear approximation. Surprisingly, we also show that quantum
entanglement provides no advantage over the classical case. On the other hand,
generalized (i.e. super-quantum) nonlocal correlations allow perfect nonlocal
computation. This gives new insights into the nature of quantum nonlocality and
its relationship to generalised nonlocal correlations.
| [
{
"version": "v1",
"created": "Thu, 12 Oct 2006 14:35:54 GMT"
}
]
| 2017-08-01T00:00:00 | [
[
"Linden",
"Noah",
""
],
[
"Popescu",
"Sandu",
""
],
[
"Short",
"Anthony J.",
""
],
[
"Winter",
"Andreas",
""
]
]
|
quant-ph/0610098 | Grigori Amosov | Grigori Amosov | On strong superadditivity for a class of quantum channels | revtex, 4 pages | null | null | null | quant-ph | null | Given a quantum channel $\Phi $ in a Hilbert space $H$ put $\hat
H_{\Phi}(\rho)=\min \limits_{\rho_{av}=\rho}\Sigma_{j=1}^{k}\pi_{j}S(\Phi
(\rho_{j}))$, where $\rho_{av}=\Sigma_{j=1}^{k}\pi_{j}\rho_{j}$, the minimum is
taken over all probability distributions $\pi =\{\pi_{j}\}$ and states
$\rho_{j}$ in $H$, $S(\rho)=-Tr\rho\log\rho$ is the von Neumann entropy of a
state $\rho$. The strong superadditivity conjecture states that $\hat H_{\Phi
\otimes \Psi}(\rho)\ge \hat H_{\Phi}(Tr_{K}(\rho))+\hat H_{\Psi}(Tr_{H}(\rho))$
for two channels $\Phi $ and $\Psi $ in Hilbert spaces $H$ and $K$,
respectively. We have proved the strong superadditivity conjecture for the
quantum depolarizing channel in prime dimensions. The estimation of the
quantity $\hat H_{\Phi\otimes \Psi}(\rho)$ for the special class of Weyl
channels $\Phi $ of the form $\Phi=\Xi \circ \Phi_{dep}$, where $\Phi_{dep}$ is
the quantum depolarizing channel and $\Xi $ is the phase damping is given.
| [
{
"version": "v1",
"created": "Thu, 12 Oct 2006 17:37:24 GMT"
},
{
"version": "v2",
"created": "Fri, 13 Oct 2006 11:49:13 GMT"
}
]
| 2007-05-23T00:00:00 | [
[
"Amosov",
"Grigori",
""
]
]
|
quant-ph/0610099 | Guifre Vidal | G. Vidal | A class of quantum many-body states that can be efficiently simulated | 4 pages, 5 figures | Phys. Rev. Lett. 101, 110501 (2008) | 10.1103/PhysRevLett.101.110501 | null | quant-ph cond-mat.str-el | null | We introduce the multi-scale entanglement renormalization ansatz (MERA), an
efficient representation of certain quantum many-body states on a D-dimensional
lattice. Equivalent to a quantum circuit with logarithmic depth and distinctive
causal structure, the MERA allows for an exact evaluation of local expectation
values. It is also the structure underlying entanglement renormalization, a
coarse-graining scheme for quantum systems on a lattice that is focused on
preserving entanglement.
| [
{
"version": "v1",
"created": "Thu, 12 Oct 2006 13:58:24 GMT"
}
]
| 2009-11-13T00:00:00 | [
[
"Vidal",
"G.",
""
]
]
|
quant-ph/0610100 | Bernhard Baumgartner | Bernhard Baumgartner, Beatrix Hiesmayr, Heide Narnhofer | A special simplex in the state space for entangled qudits | 24 pages, in connection with the Workshop 'Theory and Technology in
Quantum Information, Communication, Computation and Cryptography' June 2006,
Trieste; summary and outlook added, minor changes in notation | J. Phys. A: Math. Theor. 40 (2007) 7919-7938 | 10.1088/1751-8113/40/28/S03 | UWTh-Ph-2006-23 | quant-ph math-ph math.MP | null | Focus is on two parties with Hilbert spaces of dimension d, i.e. "qudits". In
the state space of these two possibly entangled qudits an analogue to the well
known tetrahedron with the four qubit Bell states at the vertices is presented.
The simplex analogue to this magic tetrahedron includes mixed states. Each of
these states appears to each of the two parties as the maximally mixed state.
Some studies on these states are performed, and special elements of this set
are identified. A large number of them is included in the chosen simplex which
fits exactly into conditions needed for teleportation and other applications.
Its rich symmetry - related to that of a classical phase space - helps to study
entanglement, to construct witnesses and perform partial transpositions. This
simplex has been explored in details for d=3. In this paper the mathematical
background and extensions to arbitrary dimensions are analysed.
| [
{
"version": "v1",
"created": "Thu, 12 Oct 2006 14:00:33 GMT"
},
{
"version": "v2",
"created": "Tue, 3 Apr 2007 15:51:38 GMT"
}
]
| 2011-11-09T00:00:00 | [
[
"Baumgartner",
"Bernhard",
""
],
[
"Hiesmayr",
"Beatrix",
""
],
[
"Narnhofer",
"Heide",
""
]
]
|
quant-ph/0610101 | Ling-An Wu | Yan-Hua Zhai, Xi-Hao Chen and Ling-An Wu | Two-photon interference with two independent pseudo-thermal sources | Phys. Rev. A 74, 053807 (2006) | null | 10.1103/PhysRevA.74.053807 | null | quant-ph | null | The nature of two-photon interference is a subject that has aroused renewed
interest in recent years and is still under debate. In this paper we report the
first observation of two-photon interference with independent pseudo-thermal
sources in which sub-wavelength interference is observed. The phenomenon may be
described in terms of the classical statistical distribution of the two sources
and their optical transfer functions.
| [
{
"version": "v1",
"created": "Thu, 12 Oct 2006 14:08:47 GMT"
},
{
"version": "v2",
"created": "Thu, 23 Nov 2006 08:47:26 GMT"
}
]
| 2009-11-13T00:00:00 | [
[
"Zhai",
"Yan-Hua",
""
],
[
"Chen",
"Xi-Hao",
""
],
[
"Wu",
"Ling-An",
""
]
]
|
quant-ph/0610102 | Yong Li | Yong Li, C. Bruder, and C. P. Sun | Time-dependent Fr\"ohlich transformation approach for two-atom
entanglement generated by successive passage through a cavity | 7 pages, 3 figures | Phys. Rev. A 75, 032302 (2007) | 10.1103/PhysRevA.75.032302 | null | quant-ph | null | Time-dependent Fr\"ohlich transformations can be used to derive an effective
Hamiltonian for a class of quantum systems with time-dependent perturbations.
We use such a transformation for a system with time-dependent atom-photon
coupling induced by the classical motion of two atoms in an inhomogeneous
electromagnetic field. We calculate the entanglement between the two atoms
resulting from their motion through a cavity as a function of their initial
position difference and velocity.
| [
{
"version": "v1",
"created": "Thu, 12 Oct 2006 15:32:41 GMT"
},
{
"version": "v2",
"created": "Mon, 1 Oct 2007 11:54:18 GMT"
}
]
| 2007-10-01T00:00:00 | [
[
"Li",
"Yong",
""
],
[
"Bruder",
"C.",
""
],
[
"Sun",
"C. P.",
""
]
]
|
quant-ph/0610103 | Koji Maruyama | K. Maruyama, T. Iitaka, F. Nori | Enhancement of entanglement transfer in a spin chain by phase
shift-control | 7 pages, 5 figures. v2: a fig added, the main text modified a bit | PRA75, 012325(2007). | 10.1103/PhysRevA.75.012325 | null | quant-ph | null | We study the effect of a phase shift on the amount of transferrable two-spin
entanglement in a spin chain. We consider a ferromagnetic Heisenberg/XY spin
chain, both numerically and analytically, and two mechanisms to generate a
phase shift, the Aharonov-Casher effect and the Dzyaloshinskii-Moriya
interaction. In both cases, the maximum attainable entanglement is shown to be
significantly enhanced, suggesting its potential usefulness in quantum
information processing.
| [
{
"version": "v1",
"created": "Thu, 12 Oct 2006 15:41:01 GMT"
},
{
"version": "v2",
"created": "Wed, 24 Jan 2007 06:40:50 GMT"
}
]
| 2007-07-08T00:00:00 | [
[
"Maruyama",
"K.",
""
],
[
"Iitaka",
"T.",
""
],
[
"Nori",
"F.",
""
]
]
|
quant-ph/0610104 | J. L. Lucio Dr. | J.L. Lucio M. | The role of degeneracy in the analogy between continuous variable and
spin 1/2 systems | 5 pages, 2 figures | null | 10.1088/1742-6596/84/1/012014 | null | quant-ph | null | We point out limitations to the analogy between the continuous variable and
spin 1/2 systems and show that the maximal violation of Bell inequality is
related to an infinite degeneracy. We quantify non-maximal violation of the
Bell-CHSH inequality and comment potential experimental implications of our
work.
| [
{
"version": "v1",
"created": "Thu, 12 Oct 2006 17:45:51 GMT"
}
]
| 2009-11-13T00:00:00 | [
[
"M.",
"J. L. Lucio",
""
]
]
|
quant-ph/0610105 | Shengchao Ding | Shengchao Ding, Zhi Jin, Qing Yang | Evolving Quantum Oracles with Hybrid Quantum-inspired Evolutionary
Algorithm | 8.4 pages, 5 figures and 2 tables | null | null | null | quant-ph | null | Quantum oracles play key roles in the studies of quantum computation and
quantum information. But implementing quantum oracles efficiently with
universal quantum gates is a hard work. Motivated by genetic programming, this
paper proposes a novel approach to evolve quantum oracles with a hybrid
quantum-inspired evolutionary algorithm. The approach codes quantum circuits
with numerical values and combines the cost and correctness of quantum circuits
into the fitness function. To speed up the calculation of matrix multiplication
in the evaluation of individuals, a fast algorithm of matrix multiplication
with Kronecker product is also presented. The experiments show the validity and
the effects of some parameters of the presented approach. And some
characteristics of the novel approach are discussed too.
| [
{
"version": "v1",
"created": "Fri, 13 Oct 2006 03:52:03 GMT"
}
]
| 2007-05-23T00:00:00 | [
[
"Ding",
"Shengchao",
""
],
[
"Jin",
"Zhi",
""
],
[
"Yang",
"Qing",
""
]
]
|
quant-ph/0610106 | Laurent Chusseau | Jacques Arnaud (CEM2), Laurent Chusseau (CEM2), Fabrice Philippe
(LIRMM) | Semi-classical theory of quiet lasers. I: Principles | 116 pages Second draft of a book project. To be completed by a part
II incuding extended details on application of the theory | null | null | null | quant-ph | null | When light originating from a laser diode driven by non-fluctuating
electrical currents is incident on a photo-detector, the photo-current does not
fluctuate much. Precisely, this means that the variance of the number of
photo-electrons counted over a large time interval is much smaller that the
average number of photo-electrons. At non-zero Fourier frequency $\Omega$ the
photo-current power spectrum is of the form $\Omega^2/(1+\Omega^2)$ and thus
vanishes as $\Omega\to 0$, a conclusion equivalent to the one given above. The
purpose of this paper is to show that results such as the one just cited may be
derived from a (semi-classical) theory in which neither the optical field nor
the electron wave-function are quantized. We first observe that almost any
medium may be described by a circuit and distinguish (possibly non-linear)
conservative elements such as pure capacitances, and conductances that
represent the atom-field coupling. The theory rests on the non-relativistic
approximation. Nyquist noise sources (in which the Planck term $\hbar\omega/2$
is being restored) are associated with positive or negative conductances, and
the law of average-energy conservation is enforced. We consider mainly
second-order correlations in stationary linearized regimes.
| [
{
"version": "v1",
"created": "Fri, 13 Oct 2006 06:39:04 GMT"
},
{
"version": "v2",
"created": "Mon, 22 Jan 2007 09:47:20 GMT"
}
]
| 2007-05-23T00:00:00 | [
[
"Arnaud",
"Jacques",
"",
"CEM2"
],
[
"Chusseau",
"Laurent",
"",
"CEM2"
],
[
"Philippe",
"Fabrice",
"",
"LIRMM"
]
]
|
quant-ph/0610107 | Plamen Petrov | Plamen G. Petrov, Daniel Oblak, Carlos L. Garrido Alzar, Niels
Kjaergaard, and Eugene S. Polzik | Non-destructive interferometric characterization of an optical dipole
trap | 9 pages, 6 figures, submitted to PRA | Phys. Rev. A, 75, 033803, (2007) | 10.1103/PhysRevA.75.033803 | null | quant-ph | null | A method for non-destructive characterization of a dipole trapped atomic
sample is presented. It relies on a measurement of the phase-shift imposed by
cold atoms on an optical pulse that propagates through a free space
Mach-Zehnder interferometer. Using this technique we are able to determine,
with very good accuracy, relevant trap parameters such as the atomic sample
temperature, trap oscillation frequencies and loss rates. Another important
feature is that our method is faster than conventional absorption or
fluorescence techniques, allowing the combination of high-dynamical range
measurements and a reduced number of spontaneous emission events per atom.
| [
{
"version": "v1",
"created": "Fri, 13 Oct 2006 17:46:14 GMT"
}
]
| 2015-06-26T00:00:00 | [
[
"Petrov",
"Plamen G.",
""
],
[
"Oblak",
"Daniel",
""
],
[
"Alzar",
"Carlos L. Garrido",
""
],
[
"Kjaergaard",
"Niels",
""
],
[
"Polzik",
"Eugene S.",
""
]
]
|
quant-ph/0610108 | Giuseppe Florio | P. Facchi, G. Florio, S. Pascazio | Characterizing and measuring multipartite Entanglement | 7 pages, 5 figures. Submitted to "International Journal of Quantum
Information" | International Journal of Quantum Information, Vol. 5, Nos. 1-2,
97-103 (2007) | 10.1142/S0219749907002542 | null | quant-ph | null | A method is proposed to characterize and quantify multipartite entanglement
in terms of the probability density function of bipartite entanglement over all
possible balanced bipartitions of an ensemble of qubits. The method is tested
on a class of random pure states.
| [
{
"version": "v1",
"created": "Fri, 13 Oct 2006 08:47:12 GMT"
}
]
| 2007-05-25T00:00:00 | [
[
"Facchi",
"P.",
""
],
[
"Florio",
"G.",
""
],
[
"Pascazio",
"S.",
""
]
]
|
quant-ph/0610109 | Caterina-Eloisa Mora | C. Mora, H. Briegel and B. Kraus | Quantum Kolmogorov complexity and its applications | 12 pages, no figures | null | null | null | quant-ph | null | Kolmogorov complexity is a measure of the information contained in a binary
string. We investigate here the notion of quantum Kolmogorov complexity, a
measure of the information required to describe a quantum state. We show that
for any definition of quantum Kolmogorov complexity measuring the number of
classical bits required to describe a pure quantum state, there exists a pure
n-qubit state which requires exponentially many bits of description. This is
shown by relating the classical communication complexity to the quantum
Kolmogorov complexity. Furthermore we give some examples of how quantum
Kolmogorov complexity can be applied to prove results in different fields, such
as quantum computation and thermodynamics, and we generalize it to the case of
mixed quantum states.
| [
{
"version": "v1",
"created": "Fri, 13 Oct 2006 09:26:06 GMT"
}
]
| 2007-05-23T00:00:00 | [
[
"Mora",
"C.",
""
],
[
"Briegel",
"H.",
""
],
[
"Kraus",
"B.",
""
]
]
|
quant-ph/0610110 | Mete Atature | Mete Atature, Jan Dreiser, Antonio Badolato, Atac Imamoglu | Observation of Faraday rotation from a single confined spin | null | null | 10.1038/nphys521 | null | quant-ph | null | Ability to read-out the state of a single confined spin lies at the heart of
solid-state quantum information processing. While all-optical spin measurements
using Faraday rotation has been successfully implemented in ensembles of
semiconductor spins, read-out of a single semiconductor spin has only been
achieved using transport measurements based on spin-charge conversion. Here, we
demonstrate an all-optical dispersive measurement of the spin-state of a single
electron trapped in a semiconductor quantum dot. We obtain information on the
spin state through conditional Faraday rotation of a spectrally detuned optical
field, induced by the polarization- and spin-selective trion (charged quantum
dot) transitions. To assess the sensitivity of the technique, we use an
independent resonant laser for spin-state preparation. An all-optical
dispersive measurement on single spins has the important advantage of
channeling the measurement back-action onto a conjugate observable, thereby
allowing for repetitive or continuous quantum nondemolition (QND) read-out of
the spin-state. We infer from our results that there are of order unity
back-action induced spin-flip Raman scattering events within our measurement
timescale. Therefore, straightforward improvements such as the use of a
solid-immersion lens and higher efficiency detectors would allow for
back-action evading spin measurements, without the need for a cavity.
| [
{
"version": "v1",
"created": "Fri, 13 Oct 2006 11:09:41 GMT"
}
]
| 2015-06-26T00:00:00 | [
[
"Atature",
"Mete",
""
],
[
"Dreiser",
"Jan",
""
],
[
"Badolato",
"Antonio",
""
],
[
"Imamoglu",
"Atac",
""
]
]
|
quant-ph/0610111 | Layla Hormozi | L. Hormozi, G. Zikos, N.E. Bonesteel, S.H. Simon | Topological Quantum Compiling | 20 pages, 20 figures, published version | Phys. Rev. B 75, 165310 (2007) | 10.1103/PhysRevB.75.165310 | null | quant-ph cond-mat.mes-hall | null | A method for compiling quantum algorithms into specific braiding patterns for
non-Abelian quasiparticles described by the so-called Fibonacci anyon model is
developed. The method is based on the observation that a universal set of
quantum gates acting on qubits encoded using triplets of these quasiparticles
can be built entirely out of three-stranded braids (three-braids). These
three-braids can then be efficiently compiled and improved to any required
accuracy using the Solovay-Kitaev algorithm.
| [
{
"version": "v1",
"created": "Fri, 13 Oct 2006 19:08:11 GMT"
},
{
"version": "v2",
"created": "Mon, 23 Apr 2007 21:22:11 GMT"
}
]
| 2007-05-23T00:00:00 | [
[
"Hormozi",
"L.",
""
],
[
"Zikos",
"G.",
""
],
[
"Bonesteel",
"N. E.",
""
],
[
"Simon",
"S. H.",
""
]
]
|
quant-ph/0610112 | Sascha Gaertner | S. Gaertner, C. Kurtsiefer, M. Bourennane and H. Weinfurter | Experimental demonstration of four-party quantum secret sharing | null | Phys. Rev. Lett. 98, 020503 (2007) | 10.1103/PhysRevLett.98.020503 | null | quant-ph | null | Secret sharing is a multiparty cryptographic task in which some secret
information is splitted into several pieces which are distributed among the
participants such that only an authorized set of participants can reconstruct
the original secret. Similar to quantum key distribution, in quantum secret
sharing, the secrecy of the shared information relies not on computational
assumptions, but on laws of quantum physics. Here, we present an experimental
demonstration of four-party quantum secret sharing via the resource of
four-photon entanglement.
| [
{
"version": "v1",
"created": "Fri, 13 Oct 2006 15:56:16 GMT"
}
]
| 2009-11-13T00:00:00 | [
[
"Gaertner",
"S.",
""
],
[
"Kurtsiefer",
"C.",
""
],
[
"Bourennane",
"M.",
""
],
[
"Weinfurter",
"H.",
""
]
]
|
quant-ph/0610113 | Lorenz Hartmann | L. Hartmann, B. Kraus, H.-J. Briegel and W. D\"ur | On the role of memory errors in quantum repeaters | 19 pages, 2 figures, 3 tables; V2: references updated | Phys. Rev. A 75, 032310, 2007 | 10.1103/PhysRevA.75.032310 | null | quant-ph | null | We investigate the influence of memory errors in the quantum repeater scheme
for long-range quantum communication. We show that the communication distance
is limited in standard operation mode due to memory errors resulting from
unavoidable waiting times for classical signals. We show how to overcome these
limitations by (i) improving local memory, and (ii) introducing two new
operational modes of the quantum repeater. In both operational modes, the
repeater is run blindly, i.e. without waiting for classical signals to arrive.
In the first scheme, entanglement purification protocols based on one-way
classical communication are used allowing to communicate over arbitrary
distances. However, the error thresholds for noise in local control operations
are very stringent. The second scheme makes use of entanglement purification
protocols with two-way classical communication and inherits the favorable error
thresholds of the repeater run in standard mode. One can increase the possible
communication distance by an order of magnitude with reasonable overhead in
physical resources. We outline the architecture of a quantum repeater that can
possibly ensure intercontinental quantum communication.
| [
{
"version": "v1",
"created": "Fri, 13 Oct 2006 17:16:56 GMT"
},
{
"version": "v2",
"created": "Fri, 17 Nov 2006 15:48:08 GMT"
}
]
| 2007-05-23T00:00:00 | [
[
"Hartmann",
"L.",
""
],
[
"Kraus",
"B.",
""
],
[
"Briegel",
"H. -J.",
""
],
[
"Dür",
"W.",
""
]
]
|
quant-ph/0610114 | Tun Wang | T. Wang, S. Yelin | Rotation of atoms in a two dimensional lattice with a harmonic trap | 4 pages, some paragraphs were refrased, typos corrected. beta is
corrected | null | null | null | quant-ph | null | Rotation of atoms in a lattice is studied using a Hubbard model. It is found
that the atoms are still contained in the trap even when the rotation frequency
is larger than the trapping frequency. This is very different from the behavior
in continuum. Bragg scattering and coupling between angular and radial motion
are believed to make this stability possible. In this regime, density depletion
at the center of the trap can be developed for spin polarized fermions.
| [
{
"version": "v1",
"created": "Mon, 16 Oct 2006 02:49:57 GMT"
},
{
"version": "v2",
"created": "Tue, 21 Nov 2006 21:55:21 GMT"
},
{
"version": "v3",
"created": "Tue, 13 Mar 2007 19:44:03 GMT"
}
]
| 2007-05-23T00:00:00 | [
[
"Wang",
"T.",
""
],
[
"Yelin",
"S.",
""
]
]
|
quant-ph/0610115 | Mark Wilde | Mark M. Wilde, Federico Spedalieri, Jonathan P. Dowling, Hwang Lee | Alternate Scheme for Optical Cluster-State Generation without
Number-Resolving Photon Detectors | 10 pages, 4 figures, 4 tables; made significant revisions and changed
format | International Journal of Quantum Information, Vol. 5, No. 4 (2007)
pp. 617-626 | 10.1142/S0219749907003080 | CSI-07-08-03 | quant-ph | null | We design a controlled-phase gate for linear optical quantum computing by
using photodetectors that cannot resolve photon number. An intrinsic
error-correction circuit corrects errors introduced by the detectors. Our
controlled-phase gate has a 1/4 success probability. Recent development in
cluster-state quantum computing has shown that a two-qubit gate with non-zero
success probability can build an arbitrarily large cluster state with only
polynomial overhead. Hence, it is possible to generate optical cluster states
without number-resolving detectors and with polynomial overhead.
| [
{
"version": "v1",
"created": "Mon, 16 Oct 2006 19:16:25 GMT"
},
{
"version": "v2",
"created": "Mon, 16 Oct 2006 22:55:11 GMT"
},
{
"version": "v3",
"created": "Tue, 2 Jan 2007 16:03:32 GMT"
},
{
"version": "v4",
"created": "Tue, 22 May 2007 04:06:23 GMT"
}
]
| 2009-09-29T00:00:00 | [
[
"Wilde",
"Mark M.",
""
],
[
"Spedalieri",
"Federico",
""
],
[
"Dowling",
"Jonathan P.",
""
],
[
"Lee",
"Hwang",
""
]
]
|
quant-ph/0610116 | Alexander I. Lvovsky | Juergen Appel, Dallas Hoffman, Eden Figueroa, A. I. Lvovsky | Electronic Noise in Optical Homodyne Tomography | Experimental results added | Physical Review A 75, 035802 (2007) | 10.1103/PhysRevA.75.035802 | null | quant-ph | null | The effect of the detector electronic noise in an optical homodyne tomography
experiment is shown to be equivalent to an optical loss if the detector is
calibrated by measuring the quadrature noise of the vacuum state. An explicit
relation between the electronic noise level and the equivalent optical
efficiency is obtained and confirmed in an experiment with a narrowband
squeezed vacuum source operating at an atomic rubidium wavelength.
| [
{
"version": "v1",
"created": "Fri, 13 Oct 2006 23:19:14 GMT"
},
{
"version": "v2",
"created": "Mon, 15 Jan 2007 23:50:05 GMT"
}
]
| 2010-12-03T00:00:00 | [
[
"Appel",
"Juergen",
""
],
[
"Hoffman",
"Dallas",
""
],
[
"Figueroa",
"Eden",
""
],
[
"Lvovsky",
"A. I.",
""
]
]
|
quant-ph/0610117 | M. I. Dyakonov | M. I. Dyakonov | Is Fault-Tolerant Quantum Computation Really Possible? | Based on a talk given at the Future Trends in Microelectronics
workshop, Crete, June 2006. 8 pages, 1 figure | In: Future Trends in Microelectronics. Up the Nano Creek, S.
Luryi, J. Xu, and A. Zaslavsky (eds), Wiley (2007), pp. 4-18 | null | null | quant-ph cond-mat.other cond-mat.str-el physics.atom-ph | null | The so-called "threshold" theorem says that, once the error rate per qubit
per gate is below a certain value, indefinitely long quantum computation
becomes feasible, even if all of the qubits involved are subject to relaxation
processes, and all the manipulations with qubits are not exact. The purpose of
this article, intended for physicists, is to outline the ideas of quantum error
correction and to take a look at the proposed technical instruction for
fault-tolerant quantum computation. It seems that the mathematics behind the
threshold theorem is somewhat detached from the physical reality, and that some
ideal elements are always present in the construction. This raises serious
doubts about the possibility of large scale quantum computations, even as a
matter of principle.
| [
{
"version": "v1",
"created": "Sat, 14 Oct 2006 15:07:17 GMT"
}
]
| 2007-06-13T00:00:00 | [
[
"Dyakonov",
"M. I.",
""
]
]
|
quant-ph/0610118 | Yoritoshi Adachi | Yoritoshi Adachi, Takashi Yamamoto, Masato Koashi, Nobuyuki Imoto | Simple and efficient quantum key distribution with parametric
down-conversion | 5 pages, 2 figures; published version in Phys. Rev. Lett | Phys. Rev. Lett. 99, 180503 (2007) | 10.1103/PhysRevLett.99.180503 | null | quant-ph | null | We propose an efficient quantum key distribution protocol based on the
photon-pair generation from parametric down-conversion (PDC). It uses the same
experimental setup as the conventional protocol, but a refined data analysis
enables detection of photon-number splitting attacks by utilizing information
from a built-in decoy state. Assuming the use of practical detectors, we
analyze the unconditional security of the new scheme and show that it improves
the secure key generation rate by several orders of magnitude at long
distances, using a high intensity PDC source.
| [
{
"version": "v1",
"created": "Sun, 15 Oct 2006 05:46:35 GMT"
},
{
"version": "v2",
"created": "Tue, 6 Nov 2007 05:37:44 GMT"
}
]
| 2009-11-13T00:00:00 | [
[
"Adachi",
"Yoritoshi",
""
],
[
"Yamamoto",
"Takashi",
""
],
[
"Koashi",
"Masato",
""
],
[
"Imoto",
"Nobuyuki",
""
]
]
|
quant-ph/0610119 | Peter van Loock | Peter van Loock, Christian Weedbrook, and Mile Gu | Building Gaussian Cluster States by Linear Optics | 5 Pages, 3 figures | Phys. Rev. A 76, 032321 (2007). | 10.1103/PhysRevA.76.032321 | null | quant-ph | null | The linear optical creation of Gaussian cluster states, a potential resource
for universal quantum computation, is investigated. We show that for any
Gaussian cluster state, the canonical generation scheme in terms of QND-type
interactions, can be entirely replaced by off-line squeezers and beam
splitters. Moreover, we find that, in terms of squeezing resources, the
canonical states are rather wasteful and we propose a systematic way to create
cheaper states. As an application, we consider Gaussian cluster computation in
multiple-rail encoding. This encoding may reduce errors due to finite
squeezing, even when the extra rails are achieved through off-line squeezing
and linear optics.
| [
{
"version": "v1",
"created": "Sun, 15 Oct 2006 12:12:30 GMT"
}
]
| 2009-11-13T00:00:00 | [
[
"van Loock",
"Peter",
""
],
[
"Weedbrook",
"Christian",
""
],
[
"Gu",
"Mile",
""
]
]
|
quant-ph/0610120 | Z.H. Peng | Z.H. Peng, H.F. Chu, Z.D. Wang, D.N. Zheng | Implementation of adiabatic Abelian geometric gates with superconducting
phase qubits | 14 pages, 6 figures | null | null | null | quant-ph cond-mat.supr-con | null | We have developed an adiabatic Abelian geometric quantum computation strategy
based on the non-degenerate energy eigenstates in (but not limited to)
superconducting phase-qubit systems. The fidelity of the designed quantum gate
was evaluated in the presence of simulated thermal fluctuation in
superconducting phase qubits circuit and was found to be rather robust against
the random errors. In addition, it was elucidated that the Berry phase in the
designed adiabatic evolution may be detected directly via the quantum state
tomography developed for superconducting qubits.
| [
{
"version": "v1",
"created": "Sun, 15 Oct 2006 15:32:14 GMT"
},
{
"version": "v2",
"created": "Wed, 7 Feb 2007 12:50:16 GMT"
},
{
"version": "v3",
"created": "Tue, 7 Aug 2007 05:46:26 GMT"
}
]
| 2007-08-07T00:00:00 | [
[
"Peng",
"Z. H.",
""
],
[
"Chu",
"H. F.",
""
],
[
"Wang",
"Z. D.",
""
],
[
"Zheng",
"D. N.",
""
]
]
|
quant-ph/0610121 | Olimpia Lombardi | Olimpia Lombardi and Mario Castagnino | A modal-Hamiltonian interpretation of quantum mechanics | 82 pages, no figures. Forthcoming in Studies in History and
Philosophy of Modern Physics | null | null | null | quant-ph | null | The aim of this paper is to introduce a new member of the family of the modal
interpretations of quantum mechanics. In this modal-Hamiltonian interpretation,
the Hamiltonian of the quantum system plays a decisive role in the
property-ascription rule that selects the definite-valued observables whose
possible values become actual. We show that this interpretation is effective
for solving the measurement problem, both in its ideal and its non-ideal
versions, and we argue for the physical relevance of the property-ascription
rule by applying it to well-known physical situations. Moreover, we explain how
this interpretation supplies a description of the elemental categories of the
ontology referred to by the theory, where quantum systems turn out to be
bundles of possible properties.
| [
{
"version": "v1",
"created": "Sun, 15 Oct 2006 21:14:29 GMT"
},
{
"version": "v2",
"created": "Mon, 4 Feb 2008 20:32:55 GMT"
}
]
| 2008-02-04T00:00:00 | [
[
"Lombardi",
"Olimpia",
""
],
[
"Castagnino",
"Mario",
""
]
]
|
quant-ph/0610122 | Werner Stulpe | Werner Stulpe | Classical Representations of Quantum Mechanics Related to Statistically
Complete Observables | 118 pages, no figures. This work was published 1997 as a book by
Wissenschaft und Technik Verlag Berlin. Since it has proved to be of interest
to some researchers, it is published here for an easier access | null | null | null | quant-ph | null | We present a reformulation of quantum mechanics in terms of probability
measures and functions on a general classical sample space and in particular in
terms of probability densities and functions on phase space. The basis of our
proceeding is the existence of so-called statistically complete observables and
the duality between the state spaces and the spaces of the observables, the
latter holding in the quantum as well as in the classical case. In the
phase-space context, we further discuss joint position-momentum observables,
Hilbert spaces of infinitely differentiable functions on phase space, and
dequantizations. Finally, the relation of quantum dynamics to the classical
Liouville dynamics is investigated.
| [
{
"version": "v1",
"created": "Mon, 16 Oct 2006 00:18:11 GMT"
}
]
| 2007-05-23T00:00:00 | [
[
"Stulpe",
"Werner",
""
]
]
|
quant-ph/0610123 | Eyob Alebachew Sete | Eyob Alebachew and K. Fesseha | Interaction of a two-level atom with squeezed light | 9 pages and 9 figures, in press, Opt. Commun | null | 10.1016/j.optcom.2006.10.016 | null | quant-ph | null | We consider a degenerate parametric oscillator whose cavity contains a
two-level atom. Applying the Heisenberg and quantum Langevin equations, we
calculate in the bad-cavity limit the mean photon number, the quadrature
variance, and the power spectrum for the cavity mode in general and for the
signal light and fluorescent light in particular. We also obtain the normalized
second-order correlation function for the fluorescent light. We find that the
presence of the two-level atom leads to a decrease in the degree of squeezing
of the signal light. It so turns out that the fluorescent light is in a
squeezed state and the power spectrum consists of a single peak only.
| [
{
"version": "v1",
"created": "Mon, 16 Oct 2006 05:17:32 GMT"
},
{
"version": "v2",
"created": "Mon, 6 Nov 2006 12:51:29 GMT"
}
]
| 2007-05-23T00:00:00 | [
[
"Alebachew",
"Eyob",
""
],
[
"Fesseha",
"K.",
""
]
]
|
quant-ph/0610124 | Katalin Hangos | D. Petz, K.M. Hangos, A. Magyar | Point Estimation of States of Finite Quantum Systems | 16 pages, 5 figures | null | 10.1088/1751-8113/40/28/S06 | null | quant-ph | null | The estimation of the density matrix of a $k$-level quantum system is studied
when the parametrization is given by the real and imaginary part of the entries
and they are estimated by independent measurements. It is established that the
properties of the estimation procedure depend very much on the invertibility of
the true state. In particular, in case of a pure state the estimation is less
efficient. Moreover, several estimation schemes are compared for the unknown
state of a qubit when one copy is measured at a time. It is shown that the
average mean quadratic error matrix is the smallest if the applied observables
are complementary. The results are illustrated by computer simulations.
| [
{
"version": "v1",
"created": "Mon, 16 Oct 2006 09:07:27 GMT"
}
]
| 2009-11-13T00:00:00 | [
[
"Petz",
"D.",
""
],
[
"Hangos",
"K. M.",
""
],
[
"Magyar",
"A.",
""
]
]
|
quant-ph/0610125 | Ye Yeo | Ye Yeo | Local noise can enhance entanglement teleportation | 10 pages | null | 10.1103/PhysRevA.78.022334 | null | quant-ph | null | Recently we have considered two-qubit teleportation via mixed states of four
qubits and defined the generalized singlet fraction. For single-qubit
teleportation, Badziag {\em et al.} [Phys. Rev. A {\bf 62}, 012311 (2000)] and
Bandyopadhyay [Phys. Rev. A {\bf 65}, 022302 (2002)] have obtained a family of
entangled two-qubit mixed states whose teleportation fidelity can be enhanced
by subjecting one of the qubits to dissipative interaction with the environment
via an amplitude damping channel. Here, we show that a dissipative interaction
with the local environment via a pair of time-correlated amplitude damping
channels can enhance fidelity of entanglement teleportation for a class of
entangled four-qubit mixed states. Interestingly, we find that this enhancement
corresponds to an enhancement in the quantum discord for some states.
| [
{
"version": "v1",
"created": "Mon, 16 Oct 2006 09:49:11 GMT"
}
]
| 2013-05-29T00:00:00 | [
[
"Yeo",
"Ye",
""
]
]
|
quant-ph/0610126 | Mihai Macovei | Mihai A. Macovei | Quantum tunneling through vacuum-multiparticle induced potentials | Multiparticle samples, quantum tunneling, vacuum induced potentials | Phys. Rev. A 75, 043803 (2007) | 10.1103/PhysRevA.75.043803 | null | quant-ph | null | The vacuum cavity mode induces a potential barrier and a well when an
ultra-slow excited atom enters the interaction region so that it can be
reflected or transmitted with a certain probability. We demonstrate here that a
slow-velocity excited particle tunnels freely through a vacuum electromagnetic
field mode filled with $N-1$ ground state atoms. The reason for this is the
trapping of the moving atom into its upper state due to multiparticle
influences and the corresponding decoupling from the interaction with the
environment such that the emitter does not {\it see} the induced potentials.
| [
{
"version": "v1",
"created": "Mon, 16 Oct 2006 10:08:36 GMT"
}
]
| 2009-11-13T00:00:00 | [
[
"Macovei",
"Mihai A.",
""
]
]
|
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