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2025-04-04 00:00:00
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2.83k
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
quant-ph/0604158
|
Stefan Mossmann
|
S. Mossmann, C. Jung
|
Semiclassical approach to Bose-Einstein condensates in a triple well
potential
|
15 pages, 15 figures
|
Phys. Rev. A 74, 033601 (2006)
|
10.1103/PhysRevA.74.033601
| null |
quant-ph
| null |
We present a new approach for the analysis of Bose-Einstein condensates in a
few mode approximation. This method has already been used to successfully
analyze the vibrational modes in various molecular systems and offers a new
perspective on the dynamics in many particle bosonic systems. We discuss a
system consisting of a Bose-Einstein condensate in a triple well potential.
Such systems correspond to classical Hamiltonian systems with three degrees of
freedom. The semiclassical approach allows a simple visualization of the
eigenstates of the quantum system referring to the underlying classical
dynamics. From this classification we can read off the dynamical properties of
the eigenstates such as particle exchange between the wells and entanglement
without further calculations. In addition, this approach offers new insights
into the validity of the mean-field description of the many particle system by
the Gross-Pitaevskii equation, since we make use of exactly this correspondence
in our semiclassical analysis. We choose a three mode system in order to
visualize it easily and, moreover, to have a sufficiently interesting
structure, although the method can also be extended to higher dimensional
systems.
|
[
{
"version": "v1",
"created": "Thu, 20 Apr 2006 21:06:08 GMT"
},
{
"version": "v2",
"created": "Mon, 28 Aug 2006 21:13:18 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Mossmann",
"S.",
""
],
[
"Jung",
"C.",
""
]
] |
quant-ph/0604159
|
David Clader
|
B.D. Clader, Q-Han Park, and J.H. Eberly
|
Fast Light in Fully Coherent Gain Media
|
3 pages, 3 figures. Replaced with revised version submitted to Optics
Letters
|
Optics Letters, Vol. 31, Issue 19, pp. 2921-2923, 2006
|
10.1364/OL.31.002921
| null |
quant-ph
| null |
We analyze the propagation of fast-light pulses through a finite-length
resonant gain medium both analytically and numerically. We find that intrinsic
instabilities can be avoided in attaining a substantial peak advance with an
ultra-short rather than a long or adiabatic probe.
|
[
{
"version": "v1",
"created": "Fri, 21 Apr 2006 17:08:05 GMT"
},
{
"version": "v2",
"created": "Thu, 15 Jun 2006 17:21:16 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Clader",
"B. D.",
""
],
[
"Park",
"Q-Han",
""
],
[
"Eberly",
"J. H.",
""
]
] |
quant-ph/0604160
|
Dafa Li
|
D. Li, X. Li, H. Huang, X. Li
|
The Simple Criteria of SLOCC Equivalence Classes
|
The original version was submitted to PRA in Feb. 2005, the paper No.
is AA10020. 14 pages for the present version. No figures
|
Published in Physics Letters A 359 (2006) 428-437
|
10.1016/j.physleta.2006.07.004
| null |
quant-ph
| null |
We put forward an alternative approach to the SLOCC classification of
entanglement states of three-qubit and four-qubit systems. By directly solving
matrix equations, we obtain the relations satisfied by the amplitudes of
states. The relations are readily tested since in them only addition,
subtraction and multiplication occur.
|
[
{
"version": "v1",
"created": "Fri, 21 Apr 2006 02:35:39 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Li",
"D.",
""
],
[
"Li",
"X.",
""
],
[
"Huang",
"H.",
""
],
[
"Li",
"X.",
""
]
] |
quant-ph/0604161
|
Andreas Klappenecker
|
Andreas Klappenecker and Pradeep Kiran Sarvepalli
|
Clifford Code Constructions of Operator Quantum Error Correcting Codes
|
11 pages of character theory; minor changes, theorem 6 added
| null | null | null |
quant-ph cs.IT math.IT
| null |
Recently, operator quantum error-correcting codes have been proposed to unify
and generalize decoherence free subspaces, noiseless subsystems, and quantum
error-correcting codes. This note introduces a natural construction of such
codes in terms of Clifford codes, an elegant generalization of stabilizer codes
due to Knill. Character-theoretic methods are used to derive a simple method to
construct operator quantum error-correcting codes from any classical additive
code over a finite field.
|
[
{
"version": "v1",
"created": "Fri, 21 Apr 2006 05:24:07 GMT"
},
{
"version": "v2",
"created": "Wed, 18 Oct 2006 20:46:40 GMT"
}
] | 2007-07-13T00:00:00 |
[
[
"Klappenecker",
"Andreas",
""
],
[
"Sarvepalli",
"Pradeep Kiran",
""
]
] |
quant-ph/0604162
|
Maxim Chernodub
|
M. N. Chernodub and Antti J. Niemi
|
Spin-Charge Separation and the Pauli Electron
|
7 pages; v2: new results added, references updated
|
JETPLett.85:353-357,2007
|
10.1134/S0021364007080024
|
UUITP-05/06, ITEP-LAT/2006-02, KANAZAWA/2006-03
|
quant-ph cond-mat.str-el hep-ph hep-th
| null |
The separation between the spin and the charge converts the quantum
mechanical Pauli Hamiltonian into the Hamiltonian of the non-Abelian
Georgi-Glashow model, notorious for its magnetic monopoles and confinement. The
independent spin and charge fluctuations both lead to the Faddeev model,
suggesting the existence of a deep duality structure and indicating that the
fundamental carriers of spin and charge are knotted solitons.
|
[
{
"version": "v1",
"created": "Fri, 21 Apr 2006 09:03:52 GMT"
},
{
"version": "v2",
"created": "Mon, 3 Jul 2006 21:20:09 GMT"
}
] | 2008-11-26T00:00:00 |
[
[
"Chernodub",
"M. N.",
""
],
[
"Niemi",
"Antti J.",
""
]
] |
quant-ph/0604163
|
Jens Eisert
|
J. Eisert, M.B. Plenio, D.E. Browne, S. Scheel, A. Feito
|
On the experimental feasibility of continuous-variable optical
entanglement distillation
|
5 pages, 5 figures, contribution to conference proceedings
|
Optics and Spectroscopy 103, 181 (2007)
|
10.1134/S0030400X07080012
| null |
quant-ph
| null |
Entanglement distillation aims at preparing highly entangled states out of a
supply of weakly entangled pairs, using local devices and classical
communication only. In this note we discuss the experimentally feasible schemes
for optical continuous-variable entanglement distillation that have been
presented in [D.E. Browne, J. Eisert, S. Scheel, and M.B. Plenio, Phys. Rev. A
67, 062320 (2003)] and [J. Eisert, D.E. Browne, S. Scheel, and M.B. Plenio,
Annals of Physics (NY) 311, 431 (2004)]. We emphasize their versatility in
particular with regards to the detection process and discuss the merits of the
two proposed detection schemes, namely photo-detection and homodyne detection,
in the light of experimental realizations of this idea becoming more and more
feasible.
|
[
{
"version": "v1",
"created": "Fri, 21 Apr 2006 19:23:55 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Eisert",
"J.",
""
],
[
"Plenio",
"M. B.",
""
],
[
"Browne",
"D. E.",
""
],
[
"Scheel",
"S.",
""
],
[
"Feito",
"A.",
""
]
] |
quant-ph/0604164
|
Dorje C. Brody
|
Carl M. Bender, Dorje C. Brody, Bernhard K. Meister
|
Combinatorics and field theory
|
5 pages, 4 figures
|
Twistor Newsletter 45, 36-39 (2000)
| null | null |
quant-ph hep-th
| null |
For any given sequence of integers there exists a quantum field theory whose
Feynman rules produce that sequence. An example is illustrated for the Stirling
numbers. The method employed here offers a new direction in combinatorics and
graph theory.
|
[
{
"version": "v1",
"created": "Fri, 21 Apr 2006 14:57:07 GMT"
}
] | 2013-09-13T00:00:00 |
[
[
"Bender",
"Carl M.",
""
],
[
"Brody",
"Dorje C.",
""
],
[
"Meister",
"Bernhard K.",
""
]
] |
quant-ph/0604165
|
Mikio Kozuma
|
R. Inoue, N. Kanai, T. Yonehara, Y. Miyamoto, M. Koashi and M. Kozuma
|
Entanglement of orbital angular momentum states between an ensemble of
cold atoms and a photon
|
5 pages, 3 figures
|
Phys. Rev. A 74, 053809 (2006)
|
10.1103/PhysRevA.74.053809
| null |
quant-ph
| null |
Recently, atomic ensemble and single photons were successfully entangled by
using collective enhancement [D. N. Matsukevich, \textit{et al.}, Phys. Rev.
Lett. \textbf{95}, 040405(2005).], where atomic internal states and photonic
polarization states were correlated in nonlocal manner. Here we experimentally
clarified that in an ensemble of atoms and a photon system, there also exists
an entanglement concerned with spatial degrees of freedom. Generation of
higher-dimensional entanglement between remote atomic ensemble and an
application to condensed matter physics are also discussed.
|
[
{
"version": "v1",
"created": "Fri, 21 Apr 2006 16:39:50 GMT"
},
{
"version": "v2",
"created": "Wed, 11 Oct 2006 07:37:37 GMT"
},
{
"version": "v3",
"created": "Wed, 18 Oct 2006 04:04:08 GMT"
},
{
"version": "v4",
"created": "Wed, 30 Jan 2008 06:27:56 GMT"
}
] | 2008-01-30T00:00:00 |
[
[
"Inoue",
"R.",
""
],
[
"Kanai",
"N.",
""
],
[
"Yonehara",
"T.",
""
],
[
"Miyamoto",
"Y.",
""
],
[
"Koashi",
"M.",
""
],
[
"Kozuma",
"M.",
""
]
] |
quant-ph/0604166
|
Yi-Kai Liu
|
Yi-Kai Liu
|
Consistency of Local Density Matrices is QMA-complete
|
13 pages; v2 has a better section on numerical precision, and various
other improvements; will appear in RANDOM 2006; v3 fixes some long-neglected
and possibly confusing typos in the proof of thm. 3
| null | null | null |
quant-ph
| null |
Suppose we have an n-qubit system, and we are given a collection of local
density matrices rho_1,...,rho_m, where each rho_i describes a subset C_i of
the qubits. We say that the rho_i are ``consistent'' if there exists some
global state sigma (on all n qubits) that matches each of the rho_i on the
subsets C_i. This generalizes the classical notion of the consistency of
marginal probability distributions.
We show that deciding the consistency of local density matrices is
QMA-complete (where QMA is the quantum analogue of NP). This gives an
interesting example of a hard problem in QMA. Our proof is somewhat unusual: we
give a Turing reduction from Local Hamiltonian, using a convex optimization
algorithm by Bertsimas and Vempala, which is based on random sampling. Unlike
in the classical case, simple mapping reductions do not seem to work here.
|
[
{
"version": "v1",
"created": "Fri, 21 Apr 2006 20:05:52 GMT"
},
{
"version": "v2",
"created": "Fri, 16 Jun 2006 22:41:04 GMT"
},
{
"version": "v3",
"created": "Mon, 10 Dec 2007 05:19:42 GMT"
}
] | 2007-12-10T00:00:00 |
[
[
"Liu",
"Yi-Kai",
""
]
] |
quant-ph/0604167
|
Nuno Dias
|
Nuno Costa Dias, Joao Nuno Prata
|
Features of Moyal Trajectories
|
19 pages, Latex file
|
J. Math. Phys. 48, 012109 (2007).
|
10.1063/1.2409495
| null |
quant-ph
| null |
We study the Moyal evolution of the canonical position and momentum
variables. We compare it with the classical evolution and show that, contrary
to what is commonly found in the literature, the two dynamics do not coincide.
We prove that this divergence is quite general by studying Hamiltonians of the
form $p^2 /2m + V(q)$. Several alternative formulations of Moyal dynamics are
then suggested. We introduce the concept of starfunction and use it to
reformulate the Moyal equations in terms of a system of ordinary differential
equations on the noncommutative Moyal plane. We then use this formulation to
study the semiclassical expansion of Moyal trajectories, which is cast in terms
of a (order by order in $\hbar$) recursive hierarchy of i) first order partial
differential equations as well as ii) systems of first order ordinary
differential equations. The latter formulation is derived independently for
analytic Hamiltonians as well as for the more general case of smooth local
integrable ones. We present various examples illustrating these results.
|
[
{
"version": "v1",
"created": "Sat, 22 Apr 2006 19:28:00 GMT"
}
] | 2015-06-26T00:00:00 |
[
[
"Dias",
"Nuno Costa",
""
],
[
"Prata",
"Joao Nuno",
""
]
] |
quant-ph/0604168
|
Dong Yang
|
Dong Yang
|
A simple proof of monogamy of entanglement
|
The published version. Minor changes
|
Phys. Lett. A 360, 249-250 (2006)
|
10.1016/j.physleta.2006.08.027
| null |
quant-ph
| null |
Monogamy of entanglement means that an entangled state cannot be shared with
many parties. The more parties, the less entanglement between them. In this
paper, we give a simple proof of this property and provide an upper bound of
the number of parties.
|
[
{
"version": "v1",
"created": "Mon, 24 Apr 2006 03:15:54 GMT"
},
{
"version": "v2",
"created": "Thu, 2 Nov 2006 11:57:57 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Yang",
"Dong",
""
]
] |
quant-ph/0604169
|
Michael Raymer
|
M. G. Raymer and Brian J. Smith
|
The Maxwell wave function of the photon
|
SPIE conference Optics and Photonics, Conference number 5866, The
Nature of Light: What is a Photon?" (San Diego, Aug. 2005)
| null | null | null |
quant-ph
| null |
James Clerk Maxwell unknowingly discovered a correct relativistic, quantum
theory for the light quantum, forty-three years before Einstein postulated the
photon's existence. In this theory, the usual Maxwell field is the quantum wave
function for a single photon. When the non-operator Maxwell field of a single
photon is second quantized, the standard Dirac theory of quantum optics is
obtained. Recently, quantum-state tomography has been applied to experimentally
determine photon wave functions.
|
[
{
"version": "v1",
"created": "Mon, 24 Apr 2006 04:36:07 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Raymer",
"M. G.",
""
],
[
"Smith",
"Brian J.",
""
]
] |
quant-ph/0604170
|
Esteban Guevara Hidalgo
|
Esteban Guevara Hidalgo
|
Introduction to the study of entropy in Quantum Games
|
4 pages
| null | null | null |
quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The present work is an introductory study about entropy its properties and
its role in quantum information theory. In a next work, we will use these
results to the analysis of a quantum game described by a density operator and
with its entropy equal to von Neumann's.
|
[
{
"version": "v1",
"created": "Mon, 24 Apr 2006 19:46:27 GMT"
},
{
"version": "v2",
"created": "Wed, 26 Apr 2006 14:31:27 GMT"
},
{
"version": "v3",
"created": "Tue, 24 Apr 2007 23:02:30 GMT"
},
{
"version": "v4",
"created": "Thu, 8 Dec 2016 23:08:28 GMT"
}
] | 2016-12-12T00:00:00 |
[
[
"Hidalgo",
"Esteban Guevara",
""
]
] |
quant-ph/0604171
|
Boris Levin
|
B.A. Kotov, B.M. Levin, and V.I. Sokolov
|
Orthopositronium: "On the possible relation of gravity to electricity"
|
18 pages
| null | null | null |
quant-ph
| null |
The resolve of the 'orthopositronium-lifetime puzzle' needs study of the
"isotope anomaly" in gaseous neon and also of the contribution ~ 0.002 of
nonperturbative mode into orthopositronium annihilation. The Michigan results
(2003) are considered as the first supervision of relation between gravitation
and electricity. For the decision of alternative in interpretation of new and
former results it is necessary to execute the program of additional
measurements.
|
[
{
"version": "v1",
"created": "Mon, 24 Apr 2006 07:57:36 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Kotov",
"B. A.",
""
],
[
"Levin",
"B. M.",
""
],
[
"Sokolov",
"V. I.",
""
]
] |
quant-ph/0604172
|
Soojoon Lee
|
Dong Pyo Chi, Jeong San Kim, and Soojoon Lee
|
Notes on the hidden subgroup problem on some semi-direct product groups
|
6 pages, no figures
|
Phys. Lett. A 359, 114 (2006).
| null | null |
quant-ph
| null |
We consider the hidden subgroup problem on the semi-direct product of cyclic
groups $\Z_{N}\rtimes\Z_{p}$ with some restriction on $N$ and $p$. By using the
homomorphic properties, we present a class of semi-direct product groups in
which the structures of subgroups can be easily classified. Furthermore, we
show that there exists an efficient quantum algorithm for the hidden subgroup
problem on the class.
|
[
{
"version": "v1",
"created": "Mon, 24 Apr 2006 08:24:56 GMT"
}
] | 2009-09-30T00:00:00 |
[
[
"Chi",
"Dong Pyo",
""
],
[
"Kim",
"Jeong San",
""
],
[
"Lee",
"Soojoon",
""
]
] |
quant-ph/0604173
|
Roderich Tumulka
|
Martin Daumer, Detlef Duerr, Sheldon Goldstein, Tim Maudlin, Roderich
Tumulka, Nino Zanghi
|
The Message of the Quantum?
|
4 pages, no figures
|
P. 129-132 in A. Bassi, D. Duerr, T. Weber and N. Zanghi (eds),
Quantum Mechanics: Are there Quantum Jumps? and On the Present Status of
Quantum Mechanics, AIP Conference Proceedings 844, American Institute of
Physics (2006)
|
10.1063/1.2219357
| null |
quant-ph
| null |
We criticize speculations to the effect that quantum mechanics is
fundamentally about information. We do this by pointing out how unfounded such
speculations in fact are. Our analysis focuses on the dubious claims of this
kind recently made by Anton Zeilinger.
|
[
{
"version": "v1",
"created": "Mon, 24 Apr 2006 09:44:56 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Daumer",
"Martin",
""
],
[
"Duerr",
"Detlef",
""
],
[
"Goldstein",
"Sheldon",
""
],
[
"Maudlin",
"Tim",
""
],
[
"Tumulka",
"Roderich",
""
],
[
"Zanghi",
"Nino",
""
]
] |
quant-ph/0604174
|
Akinori Kawachi
|
Masahito Hayashi, Akinori Kawachi, and Hirotada Kobayashi
|
Quantum Measurements for Hidden Subgroup Problems with Optimal Sample
Complexity
|
11 pages. Adding an application to quantum encryption schemes and
correcting editorial errors
|
Quantum Information and Computation, 8, 0345-0358 (2008)
| null | null |
quant-ph
| null |
One of the central issues in the hidden subgroup problem is to bound the
sample complexity, i.e., the number of identical samples of coset states
sufficient and necessary to solve the problem. In this paper, we present
general bounds for the sample complexity of the identification and decision
versions of the hidden subgroup problem. As a consequence of the bounds, we
show that the sample complexity for both of the decision and identification
versions is $\Theta(\log|\HH|/\log p)$ for a candidate set $\HH$ of hidden
subgroups in the case that the candidate subgroups have the same prime order
$p$, which implies that the decision version is at least as hard as the
identification version in this case. In particular, it does so for the
important instances such as the dihedral and the symmetric hidden subgroup
problems. Moreover, the upper bound of the identification is attained by the
pretty good measurement. This shows that the pretty good measurement can
identify any hidden subgroup of an arbitrary group with at most $O(\log|\HH|)$
samples.
|
[
{
"version": "v1",
"created": "Mon, 24 Apr 2006 10:36:06 GMT"
},
{
"version": "v2",
"created": "Sun, 24 Sep 2006 12:28:31 GMT"
},
{
"version": "v3",
"created": "Wed, 23 May 2007 05:57:48 GMT"
}
] | 2008-04-26T00:00:00 |
[
[
"Hayashi",
"Masahito",
""
],
[
"Kawachi",
"Akinori",
""
],
[
"Kobayashi",
"Hirotada",
""
]
] |
quant-ph/0604175
|
Mehmet Ko\c{c}ak
|
M. Kocak
|
Bound State Solutions of Klein-Gordon Equation with the Kratzer
Potential
|
6 pages
|
Chin. Phys. Lett. 24 (2007) 315
|
10.1088/0256-307X/24/2/004
| null |
quant-ph
| null |
The relativistic problem of spinless particle subject to a Kratzer potential
is analyzed. Bound state solutions for the s-wave are found by separating the
Klein-Gordon equation in two parts, unlike the similar works in the literature,
which provides one to see explicitly the relativistic contributions, if any, to
the solution in the non-relativistic limit.
|
[
{
"version": "v1",
"created": "Mon, 24 Apr 2006 12:48:35 GMT"
},
{
"version": "v2",
"created": "Thu, 10 Aug 2006 10:54:13 GMT"
}
] | 2015-06-26T00:00:00 |
[
[
"Kocak",
"M.",
""
]
] |
quant-ph/0604176
|
Rasoul Roknizadeh
|
A. Mahdifar, R. Roknizadeh, and M. H. Naderi
|
Geometric approach to nonlinear coherent states using the Higgs model
for harmonic oscillator
|
12 pages, 7 figs. To be appeared in J. Phys. A
| null |
10.1088/0305-4470/39/22/014
| null |
quant-ph
| null |
In this paper, we investigate the relation between the curvature of the
physical space and the deformation function of the deformed oscillator algebra
using non-linear coherent states approach. For this purpose, we study
two-dimensional harmonic oscillators on the flat surface and on a sphere by
applying the Higgs modell. With the use of their algebras, we show that the
two-dimensional oscillator algebra on a surface can be considered as a deformed
one-dimensional oscillator algebra where the effect of the curvature of the
surface is appeared as a deformation function. We also show that the curvature
of the physical space plays the role of deformation parameter. Then we
construct the associated coherent states on the flat surface and on a sphere
and compare their quantum statistical properties, including quadrature
squeezing and antibunching effect.
|
[
{
"version": "v1",
"created": "Mon, 24 Apr 2006 12:59:37 GMT"
},
{
"version": "v2",
"created": "Tue, 25 Apr 2006 17:23:34 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Mahdifar",
"A.",
""
],
[
"Roknizadeh",
"R.",
""
],
[
"Naderi",
"M. H.",
""
]
] |
quant-ph/0604177
|
Ilja Gerhardt
|
I. Gerhardt, G. Wrigge, P. Bushev, G. Zumofen, R. Pfab, V. Sandoghdar
|
Strong extinction of a laser beam by a single molecule
|
5 pages, 4 figures, submitted to PRL
|
Phys. Rev. Lett. 98, 033601 (2007)
|
10.1103/PhysRevLett.98.033601
| null |
quant-ph
| null |
We present an experiment where a single molecule strongly affects the
amplitude and phase of a laser field emerging from a subwavelength aperture. We
achieve a visibility of -6% in direct and +10% in cross-polarized detection
schemes. Our analysis shows that a close to full extinction should be possible
using near-field excitation.
|
[
{
"version": "v1",
"created": "Mon, 24 Apr 2006 14:15:41 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Gerhardt",
"I.",
""
],
[
"Wrigge",
"G.",
""
],
[
"Bushev",
"P.",
""
],
[
"Zumofen",
"G.",
""
],
[
"Pfab",
"R.",
""
],
[
"Sandoghdar",
"V.",
""
]
] |
quant-ph/0604178
|
Jiangbin Gong
|
Paul Brumer and Jiangbin Gong
|
The Born Rule in Quantum and Classical Mechanics
|
5 pages, no figures, to appear in Phys. Rev. A
|
Phys. Rev. A 73, 052109 (2006)
|
10.1103/PhysRevA.73.052109
| null |
quant-ph
| null |
Considerable effort has been devoted to deriving the Born rule (e.g. that
$|\psi(x)|^2 dx$ is the probability of finding a system, described by $\psi$,
between $x$ and $x + dx$) in quantum mechanics. Here we show that the Born rule
is not solely quantum mechanical; rather, it arises naturally in the Hilbert
space formulation of {\it classical} mechanics as well. These results provide
new insights into the nature of the Born rule, and impact on its understanding
in the framework of quantum mechanics.
|
[
{
"version": "v1",
"created": "Mon, 24 Apr 2006 14:37:43 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Brumer",
"Paul",
""
],
[
"Gong",
"Jiangbin",
""
]
] |
quant-ph/0604179
|
Jian Wang
|
Jian Wang, Quan Zhang, Chao-jing Tang
|
Quantum broadcast communication
| null |
Chin. Phys., 2007, 16 (7): 1868-1877
|
10.1088/1009-1963/16/7/011
| null |
quant-ph
| null |
Broadcast encryption allows the sender to securely distribute his/her secret
to a dynamically changing group of users over a broadcast channel. In this
paper, we just consider a simple broadcast communication task in quantum
scenario, which the central party broadcasts his secret to multi-receiver via
quantum channel. We present three quantum broadcast communication schemes. The
first scheme utilizes entanglement swapping and Greenberger-Horne-Zeilinger
state to realize a task that the central party broadcasts his secret to a group
of receivers who share a group key with him. In the second scheme, based on
dense coding, the central party broadcasts the secret to multi-receiver who
share each of their authentication key with him. The third scheme is a quantum
broadcast communication scheme with quantum encryption, which the central party
can broadcast the secret to any subset of the legal receivers.
|
[
{
"version": "v1",
"created": "Mon, 24 Apr 2006 18:42:35 GMT"
},
{
"version": "v2",
"created": "Tue, 25 Apr 2006 03:44:26 GMT"
},
{
"version": "v3",
"created": "Fri, 28 Apr 2006 15:38:20 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Wang",
"Jian",
""
],
[
"Zhang",
"Quan",
""
],
[
"Tang",
"Chao-jing",
""
]
] |
quant-ph/0604180
|
Giuseppe Florio
|
Antonio Trullo, Paolo Facchi, Rosario Fazio, Giuseppe Florio, Vittorio
Giovannetti, Saverio Pascazio
|
Robustness of optimal working points for non-adiabatic holonomic quantum
computation
|
14 pages, 8 figures
|
Las. Phys. 16, 1478 (2006)
|
10.1134/S1054660X06100094
| null |
quant-ph
| null |
Geometric phases are an interesting resource for quantum computation, also in
view of their robustness against decoherence effects. We study here the effects
of the environment on a class of one-qubit holonomic gates that have been
recently shown to be characterized by "optimal" working times. We numerically
analyze the behavior of these optimal points and focus on their robustness
against noise.
|
[
{
"version": "v1",
"created": "Mon, 24 Apr 2006 15:25:21 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Trullo",
"Antonio",
""
],
[
"Facchi",
"Paolo",
""
],
[
"Fazio",
"Rosario",
""
],
[
"Florio",
"Giuseppe",
""
],
[
"Giovannetti",
"Vittorio",
""
],
[
"Pascazio",
"Saverio",
""
]
] |
quant-ph/0604181
|
Fred Thaheld H
|
Fred H. Thaheld
|
The argument for an objective wave function collapse: Why spontaneous
localization collapse or no-collapse decoherence cannot solve the measurement
problem in a subjective fashion
|
8 pages, no figures
| null | null | null |
quant-ph physics.bio-ph
| null |
A more detailed analysis of the measurement problem continues to support the
position taken by Shimony and the author that collapse of the wave function
takes place in an objective manner in the rhodopsin molecule of the retina.
This casts further doubts on the theories involving a spontaneous localization
collapse process or a no-collapse decoherence process taking place in the
visual cortex in a subjective fashion. The possibility is then raised, as per
Anandan, as to whether the solution of the measurement problem in quantum
theory allows one to address the problem of quantizing gravitation.
|
[
{
"version": "v1",
"created": "Mon, 24 Apr 2006 19:06:25 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Thaheld",
"Fred H.",
""
]
] |
quant-ph/0604182
|
Muhammet Ali Can
|
Sinem Binicioglu, M. Ali Can, Alexander A. Klyachko, and Alexander S.
Shumovsky
|
Entanglement of a Single Spin-1 Object: An Example of Ubiquitous
Entanglement
|
12 pages, 2 figure : title has been changed, paper is re-organized,
new section "Violation of Bell-type condition by single spin-1" is added
| null |
10.1007/s10701-007-9149-1
| null |
quant-ph
| null |
Using a single spin-1 object as an example, we discuss a recent approach to
quantum entanglement. The key idea of the approach consists in presetting of
basic observables in the very definition of quantum system. Specification of
basic observables defines the dynamic symmetry of the system. Entangled states
of the system are then interpreted as states with maximal amount of uncertainty
of all basic observables. The approach gives purely physical picture of
entanglement. In particular, it separates principle physical properties of
entanglement from inessential. Within the model example under consideration, we
show relativity of entanglement with respect to dynamic symmetry and argue
existence of single-particle entanglement. A number of physical examples are
considered.
|
[
{
"version": "v1",
"created": "Tue, 25 Apr 2006 01:27:16 GMT"
},
{
"version": "v2",
"created": "Tue, 20 Mar 2007 21:52:41 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Binicioglu",
"Sinem",
""
],
[
"Can",
"M. Ali",
""
],
[
"Klyachko",
"Alexander A.",
""
],
[
"Shumovsky",
"Alexander S.",
""
]
] |
quant-ph/0604183
|
Matthias Christandl
|
Matthias Christandl
|
The Structure of Bipartite Quantum States - Insights from Group Theory
and Cryptography
|
PhD thesis, February 2006, University of Cambridge. Part I contains
results from quant-ph/0409016 and quant-ph/0511029, and analyses Horn's
problem in this context. Part II reviews entanglement measures, presents
results from quant-ph/0308088 and quant-ph/0501090, and provides new material
on entanglement measures, information-gain versus disturbance tradeoffs and
cheat sensitive quantum string commitment
| null | null | null |
quant-ph
| null |
This thesis presents a study of the structure of bipartite quantum states. In
the first part, the representation theory of the unitary and symmetric groups
is used to analyse the spectra of quantum states. In particular, it is shown
how to derive a one-to-one relation between the spectra of a bipartite quantum
state and its reduced states, and the Kronecker coefficients of the symmetric
group. In the second part, the focus lies on the entanglement of bipartite
quantum states. Drawing on an analogy between entanglement distillation and
secret-key agreement in classical cryptography, a new entanglement measure,
`squashed entanglement', is introduced.
|
[
{
"version": "v1",
"created": "Tue, 25 Apr 2006 08:55:12 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Christandl",
"Matthias",
""
]
] |
quant-ph/0604184
|
Yi-Xin Chen
|
Lin Chen, Yi-Xin Chen and Yu-Xue Mei
|
Classification of multipartite entanglement containing infinitely many
kinds of states
|
11 pages, revtex
| null |
10.1103/PhysRevA.74.052331
| null |
quant-ph
| null |
We give a further investigation of the range criterion and Low-to-High Rank
Generating Mode (LHRGM) introduced in \cite{Chen}, which can be used for the
classification of $2\times{M}\times{N}$ states under reversible local filtering
operations. By using of these techniques, we entirely classify the family of
$2\times4\times4$ states, which actually contains infinitely many kinds of
states. The classifications of true entanglement of $2\times(M+3)\times(2M+3)$
and $2\times(M+4)\times(2M+4)$ systems are briefly listed respectively.
|
[
{
"version": "v1",
"created": "Tue, 25 Apr 2006 08:15:20 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Chen",
"Lin",
""
],
[
"Chen",
"Yi-Xin",
""
],
[
"Mei",
"Yu-Xue",
""
]
] |
quant-ph/0604185
|
Akbar Fahmi
|
A. Fahmi
|
New Approach to Quantum Key Distribution Via Quantum Encryption
|
10 pages, 2 figures, comments welcome
| null | null | null |
quant-ph
| null |
In this Paper, we investigate the security of Zhang, Li and Guo quantum key
distribution via quantum encryption protocol [$\text{Phys. Rev. A} \textbf{64},
24302 (2001)$] and show that it is not secure against some of Eve's attacks and
with the probability one half she gets all of keys without being detected by
the two parties. The main defect in this protocol is that there is an attack
strategy by which Eve can change the previously shared Bell state between Alice
and Bob to two Bell states among herself and Alice and Bob. Hence, we show that
with probability $1/d$ its generalization to $d$-dimension systems is not
secure and show that its extension to the case of more partners based on the
reusable GHZ states is not secure and with probability one half Eve gets all of
keys without being detected by the two parties. In what follows, we show how in
going to higher dimensions those protocols can be repaired.
|
[
{
"version": "v1",
"created": "Tue, 25 Apr 2006 12:30:12 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Fahmi",
"A.",
""
]
] |
quant-ph/0604186
|
Jos\'e Gaite
|
Jose Gaite
|
Renormalization Group and Quantum Information
|
16 pages, 5 figures, accepted in Journal of Physics A
|
J.Phys.A39:7993-8006,2006
|
10.1088/0305-4470/39/25/S13
| null |
quant-ph cond-mat.str-el hep-th
| null |
The renormalization group is a tool that allows one to obtain a reduced
description of systems with many degrees of freedom while preserving the
relevant features. In the case of quantum systems, in particular,
one-dimensional systems defined on a chain, an optimal formulation is given by
White's "density matrix renormalization group". This formulation can be shown
to rely on concepts of the developing theory of quantum information.
Furthermore, White's algorithm can be connected with a peculiar type of
quantization, namely, angular quantization. This type of quantization arose in
connection with quantum gravity problems, in particular, the Unruh effect in
the problem of black-hole entropy and Hawking radiation. This connection
highlights the importance of quantum system boundaries, regarding the
concentration of quantum states on them, and helps us to understand the optimal
nature of White's algorithm.
|
[
{
"version": "v1",
"created": "Tue, 25 Apr 2006 15:16:07 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Gaite",
"Jose",
""
]
] |
quant-ph/0604187
|
Bing Qi
|
Bing Qi, Lei-Lei Huang, Hoi-Kwong Lo, Li Qian
|
Quantum key distribution based on a Sagnac loop interferometer and
polarization-insensitive phase modulators
|
4 pages
|
Optics Express Vol. 14 p4264-4269 (2006)
|
10.1364/OE.14.004264
| null |
quant-ph
| null |
We present a design for a quantum key distribution(QKD) system in a Sagnac
loop configuration, employing a novel phase modulation scheme based on
frequency shift, and demonstrate stable BB84 QKD operation with high
interference visibility and low quantum bit error rate (QBER). The phase
modulation is achieved by sending two light pulses with a fixed time delay (or
a fixed optical path delay) through a frequency shift element and by modulating
the amount of frequency shift. The relative phase between two light pulses upon
leaving the frequency-shift element is determined by both the time delay (or
the optical path delay) and the frequency shift, and can therefore be
controlled by varying the amount of frequency shift. To demonstrate its
operation, we used an acousto-optic modulator (AOM) as the frequency-shift
element, and vary the driving frequency of the AOM to encode phase
information.The interference visibility for a 40km and a 10km fiber loop is 96%
and 99%, respectively, at single photon level. We ran BB84 protocol in a 40-km
Sagnac loop setup continuously for one hour and the measured QBER remained
within the 2%~5% range. A further advantage of our scheme is that both phase
and amplitude modulation can be achieved simultaneously by frequency and
amplitude modulation of the AOM's driving signal, allowing our QKD system the
capability of implementing other protocols, such as the decoy-state QKD and the
continuous- variable QKD. We also briefly discuss a new type of Eavesdropping
strategy ("phaseremapping" attack) in bidirectional QKD system.
|
[
{
"version": "v1",
"created": "Tue, 25 Apr 2006 16:41:41 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Qi",
"Bing",
""
],
[
"Huang",
"Lei-Lei",
""
],
[
"Lo",
"Hoi-Kwong",
""
],
[
"Qian",
"Li",
""
]
] |
quant-ph/0604188
|
Azhar Iqbal
|
Azhar Iqbal
|
Investigations in quantum games using EPR-type set-ups
|
PhD thesis, University of Hull, 2006, 10 figures, 114 pages, defended
on Feb 14, 2006. The official version of this thesis is available from the
University of Hull, UK
| null | null | null |
quant-ph
| null |
Research in quantum games has flourished during recent years. However, it
seems that opinion remains divided about their true quantum character and
content. For example, one argument says that quantum games are nothing but
'disguised' classical games and that to quantize a game is equivalent to
replacing the original game by a different classical game. The present thesis
contributes towards the ongoing debate about quantum nature of quantum games by
developing two approaches addressing the related issues. Both approaches take
Einstein-Podolsky-Rosen (EPR)-type experiments as the underlying physical
set-ups to play two-player quantum games. In the first approach, the players'
strategies are unit vectors in their respective planes, with the knowledge of
coordinate axes being shared between them. Players perform measurements in an
EPR-type setting and their payoffs are defined as functions of the
correlations, i.e. without reference to classical or quantum mechanics.
Classical bimatrix games are reproduced if the input states are classical and
perfectly anti-correlated, as for a classical correlation game. However, for a
quantum correlation game, with an entangled singlet state as input,
qualitatively different solutions are obtained. The second approach uses the
result that when the predictions of a Local Hidden Variable (LHV) model are
made to violate the Bell inequalities the result is that some probability
measures assume negative values. With the requirement that classical games
result when the predictions of a LHV model do not violate the Bell
inequalities, our analysis looks at the impact which the emergence of negative
probabilities has on the solutions of two-player games which are physically
implemented using the EPR-type experiments.
|
[
{
"version": "v1",
"created": "Tue, 25 Apr 2006 17:38:05 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Iqbal",
"Azhar",
""
]
] |
quant-ph/0604189
|
Andrzej Grudka
|
Pawel Kurzynski and Andrzej Grudka
|
Graphical representation of generalized quantum measurements
|
Pedagogical paper, comments welcome
| null | null | null |
quant-ph
| null |
We present graphical representation for genaralized quantum measurements
(POVM). We represent POVM elements as Bloch vectors and find the conditions
these vectors should satisfy in order to describe realizable physical
measurements. We show how to find probability of measurement outcome in a
graphical way. The whole formalism is applied to unambigous discrimination of
nonorthogonal quantum states.
|
[
{
"version": "v1",
"created": "Wed, 26 Apr 2006 11:47:55 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Kurzynski",
"Pawel",
""
],
[
"Grudka",
"Andrzej",
""
]
] |
quant-ph/0604190
|
Dragomir Z. Djokovic
|
Dragomir Z. Djokovic
|
Multigraded Poincare series for mixed states of two qubits and the
boundary of the set of separable states
|
6 pages, no figures. Exposition improved. Abstract modified. The last
section corrected and expanded giving more accurate description of the
boundary of the set of separable states. Several new references added
| null | null | null |
quant-ph
| null |
Let M be the set of mixed states and S the set of separable states of the
two-qubit system, and G = SU(2) x SU(2) the group of local unitary
transformations (ignoring the overall phase factor). We compute the multigraded
Poincare series for the algebra of G-invariant polynomial functions on the
affine space of all Hermitian operators of trace 1. We check that this series
is consistent with the list of invariants computed by Makhlin. By using the
recent result of Augusiak et al., we show that the boundary of S decomposes
naturally into two pieces. We prove that the part of this boundary which is
contained in the relative interior of M is a smooth manifold.
|
[
{
"version": "v1",
"created": "Wed, 26 Apr 2006 11:52:22 GMT"
},
{
"version": "v2",
"created": "Mon, 8 May 2006 02:21:48 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Djokovic",
"Dragomir Z.",
""
]
] |
quant-ph/0604191
|
Huw Price
|
Huw Price
|
Probability in the Everett World: Comments on Wallace and Greaves
|
17 pages; no figures; LaTeX
| null | null | null |
quant-ph
| null |
It is often objected that the Everett interpretation of QM cannot make sense
of quantum probabilities, in one or both of two ways: either it can't make
sense of probability at all, or it can't explain why probability should be
governed by the Born rule. David Deutsch has attempted to meet these
objections. He argues not only that rational decision under uncertainty makes
sense in the Everett interpretation, but also that under reasonable
assumptions, the credences of a rational agent in an Everett world should be
constrained by the Born rule. David Wallace has developed and defended
Deutsch's proposal, and greatly clarified its conceptual basis. In particular,
he has stressed its reliance on the distinguishing symmetry of the Everett
view, viz., that all possible outcomes of a quantum measurement are treated as
equally real. The argument thus tries to make a virtue of what has usually been
seen as the main obstacle to making sense of probability in the Everett world.
In this note I outline some objections to the Deutsch-Wallace argument, and to
related proposals by Hilary Greaves about the epistemology of Everettian QM.
(In the latter case, my arguments include an appeal to an Everettian analogue
of the Sleeping Beauty problem.) The common thread to these objections is that
the symmetry in question remains a very significant obstacle to making sense of
probability in the Everett interpretation.
|
[
{
"version": "v1",
"created": "Wed, 26 Apr 2006 09:55:57 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Price",
"Huw",
""
]
] |
quant-ph/0604192
|
Claudiu Genes
|
C. Genes, P. R. Berman
|
Atomic entanglement generation with reduced decoherence via four-wave
mixing
| null |
Phys. Rev. A 73, 063828 (2006)
|
10.1103/PhysRevA.73.063828
| null |
quant-ph
| null |
In most proposals for the generation of entanglement in large ensembles of
atoms via projective measurements, the interaction with the vacuum is
responsible for both the generation of the signal that is detected and the spin
depolarization or decoherence. In consequence, one has to usually work in a
regime where the information aquisition via detection is sufficiently slow
(weak measurement regime) such as not to strongly disturb the system. We
propose here a four-wave mixing scheme where, owing to the pumping of the
atomic system into a dark state, the polarization of the ensemble is not
critically affected by spontaneous emission, thus allowing one to work in a
strong measurement regime.
|
[
{
"version": "v1",
"created": "Wed, 26 Apr 2006 16:15:09 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Genes",
"C.",
""
],
[
"Berman",
"P. R.",
""
]
] |
quant-ph/0604193
|
Al\'an Aspuru-Guzik
|
Al\'an Aspuru-Guzik, Anthony D. Dutoi, Peter J. Love and Martin
Head-Gordon
|
Simulated Quantum Computation of Molecular Energies
|
20 pages, 3 figures
|
Science 309 p. 1704, 2005
|
10.1126/science.1113479
| null |
quant-ph
| null |
The calculation time for the energy of atoms and molecules scales
exponentially with system size on a classical computer but polynomially using
quantum algorithms. We demonstrate that such algorithms can be applied to
problems of chemical interest using modest numbers of quantum bits.
Calculations of the water and lithium hydride molecular ground-state energies
have been carried out on a quantum computer simulator using a recursive
phase-estimation algorithm. The recursive algorithm reduces the number of
quantum bits required for the readout register from about 20 to 4. Mappings of
the molecular wave function to the quantum bits are described. An adiabatic
method for the preparation of a good approximate ground-state wave function is
described and demonstrated for a stretched hydrogen molecule. The number of
quantum bits required scales linearly with the number of basis functions, and
the number of gates required grows polynomially with the number of quantum
bits.
|
[
{
"version": "v1",
"created": "Wed, 26 Apr 2006 18:14:43 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Aspuru-Guzik",
"Alán",
""
],
[
"Dutoi",
"Anthony D.",
""
],
[
"Love",
"Peter J.",
""
],
[
"Head-Gordon",
"Martin",
""
]
] |
quant-ph/0604194
|
Zheng-Chuan Wang
|
Zheng-Chuan Wang
|
Expectation Value in Bell's Theorem
|
5 pages, 0 figure
| null | null | null |
quant-ph
| null |
We will demonstrate in this paper that Bell's theorem (Bell's inequality)
does not really conflict with quantum mechanics, the controversy between them
originates from the different definitions for the expectation value using the
probability distribution in Bell's inequality and the expectation value in
quantum mechanics. We can not use quantum mechanical expectation value measured
in experiments to show the violation of Bell's inequality and then further deny
the local hidden-variables theory. Considering the difference of their
expectation values, a generalized Bell's inequality is presented, which is
coincided with the prediction of quantum mechanics.
|
[
{
"version": "v1",
"created": "Wed, 26 Apr 2006 22:33:30 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Wang",
"Zheng-Chuan",
""
]
] |
quant-ph/0604195
|
Zheng-Chuan Wang
|
Zheng-Chuan Wang
|
The Unitary Transformation in Quantum Teleportation
|
4 pages, 0 figure
| null |
10.1088/0253-6102/46/5/018
| null |
quant-ph
| null |
In the well known treatment of quantum teleportation, the receiver should
convert the state of his EPR particle into the replica of the unknown quantum
state by one of four possible unitary transformations. However, the importance
of these unitary transformations must be emphasized. We will show in this paper
that the receiver can not transform the state of his particle into an exact
replica of the unknown state which the sender want to transfer if he have not a
proper implementation of these unitary transformations. In the procedure of
converting state, the inevitable coupling between EPR particle and environment
which is needed by the implementation of unitary transformations will reduce
the accuracy of the replica.
|
[
{
"version": "v1",
"created": "Wed, 26 Apr 2006 22:44:07 GMT"
}
] | 2015-06-26T00:00:00 |
[
[
"Wang",
"Zheng-Chuan",
""
]
] |
quant-ph/0604196
|
Zheng-Chuan Wang
|
Zheng-Chuan Wang
|
The Role of Detector in Which-Way Experiment
|
replacement
| null | null | null |
quant-ph
| null |
I will replace this manuscript by a new paper
|
[
{
"version": "v1",
"created": "Wed, 26 Apr 2006 22:54:02 GMT"
},
{
"version": "v2",
"created": "Wed, 30 Jan 2013 00:51:13 GMT"
}
] | 2013-01-31T00:00:00 |
[
[
"Wang",
"Zheng-Chuan",
""
]
] |
quant-ph/0604197
|
Sanjeev Naguleswaran
|
Ian Fuss, Langord B. White, Peter J. Sherman and Sanjeev Naguleswaran
|
Momentum Dynamics of One Dimensional Quantum Walks
|
Typos corrected
| null | null | null |
quant-ph
| null |
We derive the momentum space dynamic equations and state functions for one
dimensional quantum walks by using linear systems and Lie group theory. The
momentum space provides an analytic capability similar to that contributed by
the z transform in discrete systems theory. The state functions at each time
step are expressed as a simple sum of three Chebyshev polynomials. The
functions provide an analytic expression for the development of the walks with
time.
|
[
{
"version": "v1",
"created": "Thu, 27 Apr 2006 02:05:15 GMT"
},
{
"version": "v2",
"created": "Wed, 24 May 2006 07:06:05 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Fuss",
"Ian",
""
],
[
"White",
"Langord B.",
""
],
[
"Sherman",
"Peter J.",
""
],
[
"Naguleswaran",
"Sanjeev",
""
]
] |
quant-ph/0604198
|
Chi-Hang Fred Fung
|
David Shirokoff, Chi-Hang Fred Fung, and Hoi-Kwong Lo
|
Discrete Rotational Symmetry and Quantum Key Distribution Protocols
|
7 pages
|
Phys. Rev. A 75, 032341 (2007)
|
10.1103/PhysRevA.75.032341
| null |
quant-ph
| null |
We study the role of discrete rotational symmetry in quantum key distribution
by generalizing the well-known Bennett-Brassard 1984 (BB84) and
Scarani-Acin-Ribordy-Gisin 2004 (SARG04) protocols. We observe that discrete
rotational symmetry results in the protocol's invariance to continuous
rotations, thus leading to a simplified relation between bit and phase error
rates and consequently a straightforward security proof.
|
[
{
"version": "v1",
"created": "Thu, 27 Apr 2006 04:30:52 GMT"
},
{
"version": "v2",
"created": "Tue, 12 Sep 2006 14:38:39 GMT"
},
{
"version": "v3",
"created": "Fri, 22 Dec 2006 02:45:50 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Shirokoff",
"David",
""
],
[
"Fung",
"Chi-Hang Fred",
""
],
[
"Lo",
"Hoi-Kwong",
""
]
] |
quant-ph/0604199
|
Yaroslav Volovich I
|
Andrei Khrennikov, Yaroslav Volovich
|
Energy Levels of "Hydrogen Atom" in Discrete Time Dynamics
|
accepted for publication in Open Systems & Information Dynamics
| null |
10.1063/1.2158749
| null |
quant-ph
| null |
We analyze dynamical consequences of a conjecture that there exists a
fundamental (indivisible) quant of time. In particular we study the problem of
discrete energy levels of hydrogen atom. We are able to reconstruct potential
which in discrete time formalism leads to energy levels of unperturbed hydrogen
atom. We also consider linear energy levels of quantum harmonic oscillator and
show how they are produced in the discrete time formalism. More generally, we
show that in discrete time formalism finite motion in central potential leads
to discrete energy spectrum, the property which is common for quantum
mechanical theory. Thus deterministic (but discrete time!) dynamics is
compatible with discrete energy levels.
|
[
{
"version": "v1",
"created": "Thu, 27 Apr 2006 10:47:49 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Khrennikov",
"Andrei",
""
],
[
"Volovich",
"Yaroslav",
""
]
] |
quant-ph/0604200
|
Kamal Abodayeh Dr.
|
T. Barakat and K. Abodayeh
|
Exact solutions for vibrational levels of the Morse potential via the
asymptotic iteration method
| null | null |
10.1007/s10582-006-0122-6
| null |
quant-ph
| null |
Exact solutions for vibrational levels of diatomic molecules via the Morse
potential are obtained by means of the asymptotic iteration method. It is shown
that, the numerical results for the energy eigenvalues of $^{7}Li_{2}$ are all
in excellent agreement with the ones obtained before. Without any loss of
generality, other states and molecules could be treated in a similar way.
|
[
{
"version": "v1",
"created": "Thu, 27 Apr 2006 10:49:30 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Barakat",
"T.",
""
],
[
"Abodayeh",
"K.",
""
]
] |
quant-ph/0604201
|
Thomas Marlow
|
Thomas Marlow
|
Partial Observers
|
3 pages
| null | null | null |
quant-ph
| null |
We attempt to dissolve the measurement problem using an anthropic principle
which allows us to invoke rational observers. We argue that the key feature of
such observers is that they are rational (we need not care whether they are
`classical' or `macroscopic' for example) and thus, since quantum theory can be
expressed as a rational theory of probabilistic inference, the measurement
problem is not a problem.
|
[
{
"version": "v1",
"created": "Thu, 27 Apr 2006 12:21:01 GMT"
},
{
"version": "v2",
"created": "Fri, 20 Oct 2006 15:09:55 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Marlow",
"Thomas",
""
]
] |
quant-ph/0604202
|
Jean-Yves Thibon
|
Frederic Toumazet, Jean-Gabriel Luque, Jean-Yves Thibon
|
Unitary invariants of qubit systems
|
19 pages, 1 figure
|
Mathematical Structures in Computer Science 17 (2007), 1133-1151
| null | null |
quant-ph
| null |
We give an algorithm allowing to construct bases of local unitary invariants
of pure k-qubit states from the knowledge of polynomial covariants of the group
of invertible local filtering operations. The simplest invariants obtained in
this way are explicited and compared to various known entanglement measures.
Complete sets of generators are obtained for up to four qubits, and the
structure of the invariant algebras is discussed in detail.
|
[
{
"version": "v1",
"created": "Thu, 27 Apr 2006 12:53:01 GMT"
}
] | 2013-02-12T00:00:00 |
[
[
"Toumazet",
"Frederic",
""
],
[
"Luque",
"Jean-Gabriel",
""
],
[
"Thibon",
"Jean-Yves",
""
]
] |
quant-ph/0604203
|
Jonathan Hodges
|
P. Cappellaro, J. S. Hodges, T. F. Havel, D. G. Cory
|
Principles of Control for Decoherence-Free Subsystems
|
12 pages, 7 figures
|
J. Chem. Phys. 125, 044514 (2006)
|
10.1063/1.2216702
| null |
quant-ph
| null |
Decoherence-Free Subsystems (DFS) are a powerful means of protecting quantum
information against noise with known symmetry properties. Although Hamiltonians
theoretically exist that can implement a universal set of logic gates on DFS
encoded qubits without ever leaving the protected subsystem, the natural
Hamiltonians that are available in specific implementations do not necessarily
have this property. Here we describe some of the principles that can be used in
such cases to operate on encoded qubits without losing the protection offered
by the DFS. In particular, we show how dynamical decoupling can be used to
control decoherence during the unavoidable excursions outside of the DFS. By
means of cumulant expansions, we show how the fidelity of quantum gates
implemented by this method on a simple two-physical-qubit DFS depends on the
correlation time of the noise responsible for decoherence. We further show by
means of numerical simulations how our previously introduced "strongly
modulating pulses" for NMR quantum information processing can permit
high-fidelity operations on multiple DFS encoded qubits in practice, provided
that the rate at which the system can be modulated is fast compared to the
correlation time of the noise. The principles thereby illustrated are expected
to be broadly applicable to many implementations of quantum information
processors based on DFS encoded qubits.
|
[
{
"version": "v1",
"created": "Thu, 27 Apr 2006 18:33:56 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Cappellaro",
"P.",
""
],
[
"Hodges",
"J. S.",
""
],
[
"Havel",
"T. F.",
""
],
[
"Cory",
"D. G.",
""
]
] |
quant-ph/0604204
|
Qing Chen
|
Qing Chen, Jianhua Cheng, Ke-Lin Wang, Jiangfeng Du
|
Repeat-Until-Success Generation of Symmetric States without External
Control
|
4 pages, 2 figures
| null | null | null |
quant-ph
| null |
In the present paper, we propose a "repeat-until-success" scheme induced by
single particle measurement to generate arbitrary symmetric states based on
spin network. This protocol requires no modulated controls during the whole
process and it provides a persistent approach towards the desired symmetric
state. As a special case, we demonstrate that W state can be created with unit
probability within this framework.
|
[
{
"version": "v1",
"created": "Thu, 27 Apr 2006 15:23:01 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Chen",
"Qing",
""
],
[
"Cheng",
"Jianhua",
""
],
[
"Wang",
"Ke-Lin",
""
],
[
"Du",
"Jiangfeng",
""
]
] |
quant-ph/0604205
|
Zbigniew Idziaszek
|
Zbigniew Idziaszek, Tommaso Calarco
|
Analytical solutions for the dynamics of two trapped interacting
ultracold atoms
|
RevTeX, 15 pages, 15 figures
|
Phys. Rev. A 74, 022712 (2006)
|
10.1103/PhysRevA.74.022712
| null |
quant-ph
| null |
We discuss exact solutions of the Schroedinger equation for the system of two
ultracold atoms confined in an axially symmetric harmonic potential. We
investigate different geometries of the trapping potential, in particular we
study the properties of eigenenergies and eigenfunctions for quasi-one- and
quasi-two-dimensional traps. We show that the quasi-one- and the
quasi-two-dimensional regimes for two atoms can be already realized in the
traps with moderately large (or small) ratios of the trapping frequencies in
the axial and the transverse directions. Finally, we apply our theory to
Feshbach resonances for trapped atoms. Introducing in our description an
energy-dependent scattering length we calculate analytically the eigenenergies
for two trapped atoms in the presence of a Feshbach resonance.
|
[
{
"version": "v1",
"created": "Thu, 27 Apr 2006 15:25:58 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Idziaszek",
"Zbigniew",
""
],
[
"Calarco",
"Tommaso",
""
]
] |
quant-ph/0604206
|
Mary Beth Ruskai
|
Mary Beth Ruskai
|
Another Short and Elementary Proof of Strong Subadditivity of Quantum
Entropy
|
The proof given here is short and more elementary that in either
quant-ph/0404126 or quant-ph/0408130. The style is intended to be suitable to
classroom presentation. For a Much More Complicated approach, see Section 6
of quant-ph/0506196
|
Reports on Mathematical Physics 60, 1-12 (2007).
|
10.1016/S0034-4877(07)00019-5
| null |
quant-ph
| null |
A short and elementary proof of the joint convexity of relative entropy is
presented, using nothing beyond linear algebra. The key ingredients are an
easily verified integral representation and the strategy used to prove the
Cauchy-Schwarz inequality in elementary courses. Several consequences are
proved in a way which allow an elementary proof of strong subadditivity in a
few more lines. Some expository material on Schwarz inequalities for operators
and the Holevo bound for partial measurements is also included.
|
[
{
"version": "v1",
"created": "Thu, 27 Apr 2006 18:42:24 GMT"
}
] | 2016-09-08T00:00:00 |
[
[
"Ruskai",
"Mary Beth",
""
]
] |
quant-ph/0604207
|
Michael Westmoreland
|
Benjamin Schumacher, Michael D. Westmoreland
|
Quantum mutual information and the one-time pad
|
11 pages, LaTeX
| null |
10.1103/PhysRevA.74.042305
| null |
quant-ph
| null |
Alice and Bob share a correlated composite quantum system AB. If AB is used
as the key for a one-time pad cryptographic system, we show that the maximum
amount of information that Alice can send securely to Bob is the quantum mutual
information of AB.
|
[
{
"version": "v1",
"created": "Thu, 27 Apr 2006 18:59:38 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Schumacher",
"Benjamin",
""
],
[
"Westmoreland",
"Michael D.",
""
]
] |
quant-ph/0604208
|
Xiaoyu Chen
|
Xiao-yu Chen
|
The characteristic function of optical evolution
|
10 pages, 3 figures
|
J. Phys. B: At. Mol. Opt. Phys. 39 (2006)4605-4615
|
10.1088/0953-4075/39/22/005
| null |
quant-ph
| null |
The master equation of quantum optical density operator is transformed to the
equation of characteristic function. The parametric amplification and amplitude
damping as well as the phase damping are considered. The solution for the most
general initial quantum state is obtained for parametric amplification and
amplitude damping. The purity of one mode Gaussian system and the entanglement
of two mode Gaussian system are studied.
|
[
{
"version": "v1",
"created": "Fri, 28 Apr 2006 02:49:10 GMT"
},
{
"version": "v2",
"created": "Thu, 10 Aug 2006 07:04:47 GMT"
},
{
"version": "v3",
"created": "Wed, 16 Aug 2006 00:41:59 GMT"
},
{
"version": "v4",
"created": "Fri, 3 Nov 2006 00:31:24 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Chen",
"Xiao-yu",
""
]
] |
quant-ph/0604209
|
Yan-Kui Bai
|
Yan-Kui Bai, Shu-Shen Li, Hou-Zhi Zheng, and Z. D. Wang
|
Detecting a set of entanglement measures in an unknown tripartite
quantum state by local operations and classical communication
|
16 pages, 2 figures, revtex
|
Phys. Rev A 74, 022305 (2006)
|
10.1103/PhysRevA.74.022305
| null |
quant-ph
| null |
We propose a more general method for detecting a set of entanglement
measures, i.e. negativities, in an \emph{arbitrary} tripartite quantum state by
local operations and classical communication. To accomplish the detection task
using this method, three observers, Alice, Bob and Charlie, do not need to
perform the partial transposition maps by the structural physical
approximation; instead, they are only required to collectively measure some
functions via three local networks supplemented by a classical communication.
With these functions, they are able to determine the set of negativities
related to the tripartite quantum state.
|
[
{
"version": "v1",
"created": "Fri, 28 Apr 2006 14:55:22 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Bai",
"Yan-Kui",
""
],
[
"Li",
"Shu-Shen",
""
],
[
"Zheng",
"Hou-Zhi",
""
],
[
"Wang",
"Z. D.",
""
]
] |
quant-ph/0604210
|
Rahul Bijurkar
|
Rahul Bijurkar
|
Representation of Qudits on a Riemann Sphere
|
6 pages, General derivation added
| null | null | null |
quant-ph
| null |
In quantum computation and information science, the geometrical
representations based on the Bloch sphere representation for transformations of
two state systems have been traditionally used. While this representation is
very useful for the two state qubit, it cannot be generalized easily to
multiple states like that of qudits and when it is generalized, it looses its
simple geometrical representation.
This paper proposes the use of an alternative representation in quantum
information and computation for qubits as well as qudits based on the Majorana
representation on the Riemann Sphere, which preserves the simple sphere
representation.
|
[
{
"version": "v1",
"created": "Fri, 28 Apr 2006 15:11:16 GMT"
},
{
"version": "v2",
"created": "Tue, 20 Mar 2007 07:21:18 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Bijurkar",
"Rahul",
""
]
] |
quant-ph/0604211
|
Jeroen van Houwelingen
|
J.A.W. van Houwelingen, A. Beveratos, N. Brunner, N. Gisin and H.
Zbinden
|
Experimental Quantum Teleportation with a 3-Bell-state Analyzer
|
11 pages, 14 figures
|
Phys. Rev. A 74, 022303 (2006)
|
10.1103/PhysRevA.74.022303
| null |
quant-ph
| null |
We present a Bell-state analyzer for time-bin qubits allowing the detection
of three out of four Bell-states with linear optics, two detectors and no
auxiliary photons. The theoretical success rate of this scheme is 50%. A
teleportation experiment was performed to demonstrate its functionality. We
also present a teleportation experiment with a Fidelity larger than the cloning
limit of F=5/6.
|
[
{
"version": "v1",
"created": "Fri, 28 Apr 2006 16:02:50 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"van Houwelingen",
"J. A. W.",
""
],
[
"Beveratos",
"A.",
""
],
[
"Brunner",
"N.",
""
],
[
"Gisin",
"N.",
""
],
[
"Zbinden",
"H.",
""
]
] |
quant-ph/0604212
|
Aurelian Isar
|
A. Isar
|
Purity of states in the theory of open quantum systems
|
17 pages
|
Romanian Journal of Physics, Vol. 43, No. 7-8, p. 481 (1998)
| null | null |
quant-ph
| null |
The condition of purity of states for a damped harmonic oscillator is
considered in the framework of Lindblad theory for open quantum systems. For a
special choice of the environment coefficients, the correlated coherent states
are shown to be the only states which remain pure all the time during the
evolution of the considered system. These states are also the most stable under
evolution in the presence of the environment.
|
[
{
"version": "v1",
"created": "Fri, 28 Apr 2006 16:11:45 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Isar",
"A.",
""
]
] |
quant-ph/0604213
|
Gennady Berman
|
G.P. Berman and A.A. Chumak
|
Photon Distribution Function for Long-Distance Propagation of Partially
Coherent Beams through the Turbulent Atmosphere
|
28 pages, 4 figures
| null |
10.1103/PhysRevA.74.013805
|
LAUR-06-1605
|
quant-ph
| null |
The photon density operator function is used to calculate light beam
propagation through turbulent atmosphere. A kinetic equation for the photon
distribution function is derived and solved using the method of
characteristics. Optical wave correlations are described in terms of photon
trajectories that depend on fluctuations of the refractive index. It is shown
that both linear and quadratic disturbances produce sizable effects for
long-distance propagation. The quadratic terms are shown to suppress the
correlation of waves with different wave vectors. We examine the intensity
fluctuations of partially coherent beams (beams whose initial spatial coherence
is partially destroyed). Our calculations show that it is possible to
significantly reduce the intensity fluctuations by using a partially coherent
beam. The physical mechanism responsible for this pronounced reduction is
similar to that of the Hanbury-Braun, Twiss effect.
|
[
{
"version": "v1",
"created": "Fri, 28 Apr 2006 16:19:46 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Berman",
"G. P.",
""
],
[
"Chumak",
"A. A.",
""
]
] |
quant-ph/0604214
|
N. M. Chase
|
N. M. Chase
|
Wave-Particle Fluctuations, Coherence, and Bose-Einstein Condensation
| null | null | null | null |
quant-ph
| null |
By extending Einstein's separation of wave and particle parts of the second
order thermal fluctuation to encompass "generalized fluctuations" in any Bose
field, P. E. Gordon has proposed alternative definitions for nth order
coherence and nth order coherent states. The main point of this paper is to
explore some of the physical insights to be gained by extending dualism to
higher orders. Recent experiments have examined aspects of the coherence of
Bose-Einstein condensates. It has been argued that the condensate state is
coherent to (at least) second or third order, but the coherence properties of
Bose-Einstein condensates remain somewhat controversial. Using probability
distributions developed by M. O. Scully and V. V. Kocharovsky et. al., we apply
Gordon's dualistic expression of the coherence conditions to investigate
coherence properties in Bose-Einstein condensation. Via numerical calculations,
we present a graphical survey of wave-like and particle-like fluctuations in
condensed and uncondensed fractions. Near the critical point, we find a very
marked peak in the ratio of nth order wave to nth order particle fluctuations
in the condensate. Not surprisingly, n-point correlations between the positions
of condensate atoms also peak near the critical temperature, and this
apparently mirrors, to higher orders, the well-known relation between the
integral of the 2-point correlation function over a certain volume and the rms
fluctuation in the number of particles in that volume.
|
[
{
"version": "v1",
"created": "Fri, 28 Apr 2006 17:23:15 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Chase",
"N. M.",
""
]
] |
quant-ph/0604215
|
Marco Roncaglia
|
L. Campos Venuti, C. Degli Esposti Boschi and M. Roncaglia
|
Long-distance entanglement in spin systems
|
RevTex, 5 pages, 7 .eps figures Two references added in published
version
|
Phys. Rev. Lett. 96, 247206 (2006)
|
10.1103/PhysRevLett.96.247206
| null |
quant-ph cond-mat.str-el
| null |
Most quantum system with short-ranged interactions show a fast decay of
entanglement with the distance. In this Letter, we focus on the peculiarity of
some systems to distribute entanglement between distant parties. Even in
realistic models, like the spin-1 Heisenberg chain, sizable entanglement is
present between arbitrarily distant particles. We show that long distance
entanglement appears for values of the microscopic parameters which do not
coincide with known quantum critical points, hence signaling a transition
detected only by genuine quantum correlations.
|
[
{
"version": "v1",
"created": "Fri, 28 Apr 2006 17:28:42 GMT"
},
{
"version": "v2",
"created": "Tue, 2 May 2006 14:52:21 GMT"
},
{
"version": "v3",
"created": "Mon, 26 Jun 2006 11:12:36 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Venuti",
"L. Campos",
""
],
[
"Boschi",
"C. Degli Esposti",
""
],
[
"Roncaglia",
"M.",
""
]
] |
quant-ph/0604216
|
Samuel Portmann
|
Samuel Portmann, Adrian Wuethrich
|
Minimal Assumption Derivation of a weak Clauser-Horne Inequality
|
25 pages, 3 figures
|
Studies In History and Philosophy of Science Part B: Studies In
History and Philosophy of Modern Physics 38(4), 844-862 (2007)
|
10.1016/j.shpsb.2007.02.002
| null |
quant-ph
| null |
According to Bell's theorem a large class of hidden-variable models obeying
Bell's notion of local causality conflict with the predictions of quantum
mechanics. Recently, a Bell-type theorem has been proven using a weaker notion
of local causality, yet assuming the existence of perfectly correlated event
types. Here we present a similar Bell-type theorem without this latter
assumption. The derived inequality differs from the Clauser-Horne inequality by
some small correction terms, which render it less constraining.
|
[
{
"version": "v1",
"created": "Fri, 28 Apr 2006 19:21:21 GMT"
}
] | 2012-03-05T00:00:00 |
[
[
"Portmann",
"Samuel",
""
],
[
"Wuethrich",
"Adrian",
""
]
] |
quant-ph/0605001
|
Marco Piani
|
A. Miranowicz, M. Piani, P. Horodecki, R. Horodecki
|
Inseparability criteria based on matrices of moments
|
11 pages; shortened version, introduction improved, accepted for
publication in PRA
|
Phys. Rev. A 80, 052303 (2009).
|
10.1103/PhysRevA.80.052303
| null |
quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Inseparability criteria for continuous and discrete bipartite quantum states
based on moments of annihilation and creation operators are studied by
developing the idea of Shchukin-Vogel criterion [Phys. Rev. Lett. {\bf 95},
230502 (2005)]. If a state is separable, then the corresponding matrix of
moments is separable too. Thus, we derive generalized criteria, based on the
separability properties of the matrix of moments, are thus derived. In
particular, a new criterion based on realignment of moments in the matrix is
proposed as an analogue of the standard realignment criterion for density
matrices. Other inseparability inequalities are obtained by applying positive
maps to the matrix of moments. Usefulness of the Shchukin-Vogel criterion to
describe bipartite-entanglement of more than two modes is demonstrated: We
obtain some previously known three-mode inseparability criteria originally
derived from the Cauchy-Schwarz inequality, and we introduce new ones.
|
[
{
"version": "v1",
"created": "Mon, 1 May 2006 18:47:23 GMT"
},
{
"version": "v2",
"created": "Wed, 18 Oct 2006 17:38:43 GMT"
},
{
"version": "v3",
"created": "Wed, 7 Oct 2009 11:49:23 GMT"
}
] | 2009-11-04T00:00:00 |
[
[
"Miranowicz",
"A.",
""
],
[
"Piani",
"M.",
""
],
[
"Horodecki",
"P.",
""
],
[
"Horodecki",
"R.",
""
]
] |
quant-ph/0605002
|
Aziz Kolkiran
|
Aziz Kolkiran and G. S. Agarwal
|
Towards Heisenberg Limit in Magnetometry with Parametric Down Converted
Photons
|
4.2 pages, 6 figures
|
Phys. Rev. A 74, 053810 (2006)
|
10.1103/PhysRevA.74.053810
| null |
quant-ph
| null |
Recent theoretical and experimental papers have shown how one can achieve
Heisenberg limited measurements by using entangled photons. Here we show how
the photons in non-collinear down conversion process can be used for improving
the sensitivity of magneto-optical rotation by a factor of four which takes us
towards the Heisenberg limit. Our results apply to sources with arbitrary
pumping. We also present several generalizations of earlier results for the
collinear geometry. The sensitivity depends on whether the two-photon or
four-photon coincidence detection is used.
|
[
{
"version": "v1",
"created": "Fri, 28 Apr 2006 22:26:06 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Kolkiran",
"Aziz",
""
],
[
"Agarwal",
"G. S.",
""
]
] |
quant-ph/0605003
|
Rubens Ramos Viana
|
Rubens Viana Ramos, Paulo Benicio de Sousa and David Sena Oliveira
|
Solving mathematical problems with quantum search algorithm
|
9 pages, 6 figures
| null | null | null |
quant-ph
| null |
Quantum computation has attracted much attention since it was shown by Shor
and Grover the possibility to implement quantum algorithms able to realize,
respectively, factoring and searching in a faster way than any other known
classical algorithm. It is possible to use Grover algorithm, taking profit of
its ability to find a specific value in a unordered database, to find, for
example, the zero of a logical function; the minimal or maximal value in a
database or to recognize if an odd number is prime or not. Here we show quantum
algorithms to solve those cited mathematical problems. The solution requires
the use of a quantum bit string comparator being used as oracle. This quantum
circuit compares two quantum states and identifies if they are equal or,
otherwise, which of them is the largest. Moreover, we also show the quantum bit
string comparator allow us to implement conditional statements in quantum
computation, a fundamental structure for designing of algorithms.
|
[
{
"version": "v1",
"created": "Sat, 29 Apr 2006 00:02:24 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Ramos",
"Rubens Viana",
""
],
[
"de Sousa",
"Paulo Benicio",
""
],
[
"Oliveira",
"David Sena",
""
]
] |
quant-ph/0605004
|
Samuel J. Lomonaco jr
|
Samuel J. Lomonaco, Jr., and Louis H. Kauffman
|
Topological Quantum Computing and the Jones Polynomial
|
19 pages, 27 figures
| null |
10.1117/12.665361
| null |
quant-ph
| null |
In this paper, we give a description of a recent quantum algorithm created by
Aharonov, Jones, and Landau for approximating the values of the Jones
polynomial at roots of unity of the form exp(2$\pi$i/k). This description is
given with two objectives in mind. The first is to describe the algorithm in
such a way as to make explicit the underlying and inherent control structure.
The second is to make this algorithm accessible to a larger audience.
|
[
{
"version": "v1",
"created": "Sat, 29 Apr 2006 16:40:41 GMT"
}
] | 2012-08-27T00:00:00 |
[
[
"Lomonaco,",
"Samuel J.",
"Jr."
],
[
"Kauffman",
"Louis H.",
""
]
] |
quant-ph/0605005
|
Kimball A. Milton
|
Iver Brevik, Simen A. Ellingsen and Kimball A. Milton
|
Thermal corrections to the Casimir effect
|
21 pages, 9 eps figures, uses iopart.cls. Final version to be
published in New Journal of Physics, contains Conclusion and clarified
remarks
|
New J.Phys.8:236,2006
|
10.1088/1367-2630/8/10/236
| null |
quant-ph hep-th
| null |
The Casimir effect, reflecting quantum vacuum fluctuations in the
electromagnetic field in a region with material boundaries, has been studied
both theoretically and experimentally since 1948. The forces between dielectric
and metallic surfaces both plane and curved have been measured at the 10 to 1
percent level in a variety of room-temperature experiments, and remarkable
agreement with the zero-temperature theory has been achieved. In fitting the
data various corrections due to surface roughness, patch potentials, curvature,
and temperature have been incorporated. It is the latter that is the subject of
the present article. We point out that, in fact, no temperature dependence has
yet been detected, and that the experimental situation is still too fluid to
permit conclusions about thermal corrections to the Casimir effect.
Theoretically, there are subtle issues concerning thermodynamics and
electrodynamics which have resulted in disparate predictions concerning the
nature of these corrections. However, a general consensus has seemed to emerge
that suggests that the temperature correction to the Casimir effect is
relatively large, and should be observable in future experiments involving
surfaces separated at the few micrometer scale.
|
[
{
"version": "v1",
"created": "Sat, 29 Apr 2006 21:30:03 GMT"
},
{
"version": "v2",
"created": "Tue, 2 May 2006 14:18:02 GMT"
},
{
"version": "v3",
"created": "Mon, 22 May 2006 19:58:35 GMT"
},
{
"version": "v4",
"created": "Thu, 6 Jul 2006 22:28:39 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Brevik",
"Iver",
""
],
[
"Ellingsen",
"Simen A.",
""
],
[
"Milton",
"Kimball A.",
""
]
] |
quant-ph/0605006
|
Jian Wang
|
Jian Wang, Quan Zhang, Chao-jing Tang
|
Multiparty simultaneous quantum identity authentication based on
entanglement swapping
| null |
Chin. Phys. Lett., 2006, 23(9):2360-2363
|
10.1088/0256-307X/23/9/004
| null |
quant-ph
| null |
We present a multiparty simultaneous quantum identity authentication protocol
based on entanglement swapping. In our protocol, the multi-user can be
authenticated by a trusted third party simultaneously.
|
[
{
"version": "v1",
"created": "Sun, 30 Apr 2006 04:27:02 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Wang",
"Jian",
""
],
[
"Zhang",
"Quan",
""
],
[
"Tang",
"Chao-jing",
""
]
] |
quant-ph/0605007
|
I. Boztosun
|
F. Yasuk, I. Boztosun and A. Durmus
|
Orthogonal polynomial solutions to the non-central modified Kratzer
potential
|
New sections are added
| null | null | null |
quant-ph math-ph math.MP
| null |
We investigate the analytical solution of a new exactly solvable non-central
potential of $V(r,\theta) = D({\frac{r - a}{r}})^2+{\frac{\beta}{r^2\sin^2
\theta}}+{\frac{\gamma \cos \theta}{r^2\sin^2 \theta}}$ type, which may be
called as the modified non-central Kratzer potential. The energy eigenvalues as
well as the corresponding eigenfunctions are calculated for various values of
$n$ and $m$ quantum numbers within the framework of the Nikiforov-Uvarov and
Asymtotic Iteration Methods for the $CO$ diatomic molecule as an application of
this potential. In this paper, we first present the effect of the non-central
term on the bound-state energy eigenvalues: this effect is determined
explicitly for different $n$ and $m$ quantum numbers with $\beta=\gamma$=0.0,
0.1, 1.0 and 5.0 values and the results are compared with the findings of the
modified Kratzer potential for different $n$ and $l$ quantum numbers. Then, we
show that the angle-dependent non-central part behaves like a centrifugal
barrier and it reduces the depth of the attractive potential pocket, which
effects the bound-state energy eigenvalues.
|
[
{
"version": "v1",
"created": "Sun, 30 Apr 2006 14:58:44 GMT"
},
{
"version": "v2",
"created": "Thu, 14 Sep 2006 23:51:46 GMT"
},
{
"version": "v3",
"created": "Sun, 11 Feb 2007 16:53:57 GMT"
}
] | 2009-09-29T00:00:00 |
[
[
"Yasuk",
"F.",
""
],
[
"Boztosun",
"I.",
""
],
[
"Durmus",
"A.",
""
]
] |
quant-ph/0605008
|
Joseph Henson
|
David Craig, Fay Dowker, Joe Henson, Seth Major, David Rideout and
Rafael D. Sorkin
|
A Bell Inequality Analog in Quantum Measure Theory
|
38 pages, TeX. Several changes and added comments to bring out the
meaning more clearly. Minor rewording and extra acknowledgements, now closer
to published version
|
J.Phys.A40:501-523,2007
|
10.1088/1751-8113/40/3/010
| null |
quant-ph gr-qc
| null |
One obtains Bell's inequalities if one posits a hypothetical joint
probability distribution, or {\it measure}, whose marginals yield the
probabilities produced by the spin measurements in question. The existence of a
joint measure is in turn equivalent to a certain causality condition known as
``screening off''. We show that if one assumes, more generally, a joint {\it
quantal measure}, or ``decoherence functional'', one obtains instead an
analogous inequality weaker by a factor of $\sqrt{2}$. The proof of this
``Tsirel'son inequality'' is geometrical and rests on the possibility of
associating a Hilbert space to any strongly positive quantal measure. These
results lead both to a {\it question}: ``Does a joint measure follow from some
quantal analog of `screening off'?'', and to the {\it observation} that
non-contextual hidden variables are viable in histories-based quantum
mechanics, even if they are excluded classically.
|
[
{
"version": "v1",
"created": "Sun, 30 Apr 2006 15:52:18 GMT"
},
{
"version": "v2",
"created": "Thu, 6 Jul 2006 05:50:29 GMT"
},
{
"version": "v3",
"created": "Mon, 11 Dec 2006 14:46:15 GMT"
}
] | 2010-04-14T00:00:00 |
[
[
"Craig",
"David",
""
],
[
"Dowker",
"Fay",
""
],
[
"Henson",
"Joe",
""
],
[
"Major",
"Seth",
""
],
[
"Rideout",
"David",
""
],
[
"Sorkin",
"Rafael D.",
""
]
] |
quant-ph/0605009
|
Dennis Kretschmann
|
Dennis Kretschmann, Dirk Schlingemann, Reinhard F. Werner
|
The Information-Disturbance Tradeoff and the Continuity of Stinespring's
Representation
|
18 pages, 2 eps figures
| null | null | null |
quant-ph
| null |
Stinespring's dilation theorem is the basic structure theorem for quantum
channels: it states that any quantum channel arises from a unitary evolution on
a larger system. Here we prove a continuity theorem for Stinespring's dilation:
if two quantum channels are close in cb-norm, then it is always possible to
find unitary implementations which are close in operator norm, with
dimension-independent bounds. This result generalizes Uhlmann's theorem from
states to channels and allows to derive a formulation of the
information-disturbance tradeoff in terms of quantum channels, as well as a
continuity estimate for the no-broadcasting theorem. We briefly discuss further
implications for quantum cryptography, thermalization processes, and the black
hole information loss puzzle.
|
[
{
"version": "v1",
"created": "Sun, 30 Apr 2006 18:58:21 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Kretschmann",
"Dennis",
""
],
[
"Schlingemann",
"Dirk",
""
],
[
"Werner",
"Reinhard F.",
""
]
] |
quant-ph/0605010
|
Olivier Landry
|
Olivier Landry, J.A.W. van Houwelingen, Alexios Beveratos, Hugo
Zbinden, and Nicolas Gisin
|
Quantum teleportation over the Swisscom telecommunication network
|
6 pages, 7 figures, updated references on May 3rd. To be published in
Journal of the Optical Society of America B, Feature issue "Optical
Quantum-Information Science", February 2007
|
J. Opt. Soc. Am. B vol. 24 no. 2 (2007) page 398
|
10.1364/JOSAB.24.000398
| null |
quant-ph
| null |
We present a quantum teleportation experiment in the quantum relay
configuration using the installed telecommunication network of Swisscom. In
this experiment, the Bell state measurement occurs well after the entanglement
has been distributed, at a point where the photon upon which data is teleported
is already far away, and the entangled qubits are photons created from a
different crystal and laser pulse than the teleported qubit. A raw fidelity of
0.93+/-0.04 has been achieved using a heralded single-photon source.
|
[
{
"version": "v1",
"created": "Mon, 1 May 2006 08:54:39 GMT"
},
{
"version": "v2",
"created": "Wed, 3 May 2006 12:39:52 GMT"
}
] | 2015-06-26T00:00:00 |
[
[
"Landry",
"Olivier",
""
],
[
"van Houwelingen",
"J. A. W.",
""
],
[
"Beveratos",
"Alexios",
""
],
[
"Zbinden",
"Hugo",
""
],
[
"Gisin",
"Nicolas",
""
]
] |
quant-ph/0605011
|
Yehonatan Knoll
|
Yehonatan Knoll and Irad Yavneh
|
Coupled wave-particle dynamics as a possible ontology behind Quantum
Mechanics and long-range interactions
|
Withdrawn. See arXiv:0902.4606v1
| null | null | null |
quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The preliminary ideas presented in this paper have been fully developed in
arXiv:0902.4606v1 .
|
[
{
"version": "v1",
"created": "Mon, 1 May 2006 14:48:10 GMT"
},
{
"version": "v2",
"created": "Mon, 29 May 2006 13:53:01 GMT"
},
{
"version": "v3",
"created": "Sun, 1 Mar 2009 15:40:23 GMT"
}
] | 2009-03-01T00:00:00 |
[
[
"Knoll",
"Yehonatan",
""
],
[
"Yavneh",
"Irad",
""
]
] |
quant-ph/0605012
|
Santosh Pisharody
|
J. M. Murray, S. N. Pisharody, H. Wen, C. Rangan, P. H. Bucksbaum
|
Information hiding and retrieval in Rydberg wave packets using
half-cycle pulses
|
4 pages, 4 figures
| null |
10.1103/PhysRevA.74.043402
| null |
quant-ph
| null |
We demonstrate an information hiding and retrieval scheme with the relative
phases between states in a Rydberg wave packet acting as the bits of a data
register. We use a terahertz half-cycle pulse (HCP) to transfer phase-encoded
information from an optically accessible angular momentum manifold to another
manifold which is not directly accessed by our laser pulses, effectively hiding
the information from our optical interferometric measurement techniques. A
subsequent HCP acting on these wave packets reintroduces the information back
into the optically accessible data register manifold which can then be `read'
out.
|
[
{
"version": "v1",
"created": "Mon, 1 May 2006 19:45:52 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Murray",
"J. M.",
""
],
[
"Pisharody",
"S. N.",
""
],
[
"Wen",
"H.",
""
],
[
"Rangan",
"C.",
""
],
[
"Bucksbaum",
"P. H.",
""
]
] |
quant-ph/0605013
|
Anil Shaji
|
Sergio Boixo, Carlton M. Caves, Animesh Datta, Anil Shaji
|
On Decoherence in Quantum Clock Synchronization
|
12 Pages, 3 Figures
|
Laser Physics, 16, 1525 (2006). Special Issue on Quantum
Information and Quantum Computation.
|
10.1134/S1054660X06110065
| null |
quant-ph
| null |
We study two quantum versions of the Eddington clock-synchronization protocol
in the presence of decoherence. The first protocol uses maximally entangled
states to achieve the Heisenberg limit for clock synchronization. The second
protocol achieves the limit without using entanglement. We show the equivalence
of the two protocols under any single-qubit decoherence model that does not
itself provide synchronization information.
|
[
{
"version": "v1",
"created": "Mon, 1 May 2006 20:00:09 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Boixo",
"Sergio",
""
],
[
"Caves",
"Carlton M.",
""
],
[
"Datta",
"Animesh",
""
],
[
"Shaji",
"Anil",
""
]
] |
quant-ph/0605014
|
Konrad Kieling
|
D. Gross, K. Kieling, J. Eisert
|
Potential and limits to cluster state quantum computing using
probabilistic gates
|
18 pages, 10 figures, replaced with published version
|
Phys. Rev. A 74, 042343 (2006)
|
10.1103/PhysRevA.74.042343
| null |
quant-ph
| null |
We establish bounds to the necessary resource consumption when building up
cluster states for one-way computing using probabilistic gates. Emphasis is put
on state preparation with linear optical gates, as the probabilistic character
is unavoidable here. We identify rigorous general bounds to the necessary
consumption of initially available maximally entangled pairs when building up
one-dimensional cluster states with individually acting linear optical quantum
gates, entangled pairs and vacuum modes. As the known linear optics gates have
a limited maximum success probability, as we show, this amounts to finding the
optimal classical strategy of fusing pieces of linear cluster states. A formal
notion of classical configurations and strategies is introduced for
probabilistic non-faulty gates. We study the asymptotic performance of
strategies that can be simply described, and prove ultimate bounds to the
performance of the globally optimal strategy. The arguments employ methods of
random walks and convex optimization. This optimal strategy is also the one
that requires the shortest storage time, and necessitates the fewest
invocations of probabilistic gates. For two-dimensional cluster states, we
find, for any elementary success probability, an essentially deterministic
preparation of a cluster state with quadratic, hence optimal, asymptotic
scaling in the use of entangled pairs. We also identify a percolation effect in
state preparation, in that from a threshold probability on, almost all
preparations will be either successful or fail. We outline the implications on
linear optical architectures and fault-tolerant computations.
|
[
{
"version": "v1",
"created": "Mon, 1 May 2006 20:00:26 GMT"
},
{
"version": "v2",
"created": "Wed, 7 Mar 2007 12:16:46 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Gross",
"D.",
""
],
[
"Kieling",
"K.",
""
],
[
"Eisert",
"J.",
""
]
] |
quant-ph/0605015
|
Kurt Jacobs
|
Kurt Jacobs
|
Applications of Feedback Control in Quantum Systems
|
Plenary paper for ASCC06. Gives an introductory review of the field
|
Proceedings of the 6th Asian Control Conference, p. 35 (2006)
| null | null |
quant-ph
| null |
We give an introduction to feedback control in quantum systems, as well as an
overview of the variety of applications which have been explored to date. This
introductory review is aimed primarily at control theorists unfamiliar with
quantum mechanics, but should also be useful to quantum physicists interested
in applications of feedback control. We explain how feedback in quantum systems
differs from that in traditional classical systems, and how in certain cases
the results from modern optimal control theory can be applied directly to
quantum systems. In addition to noise reduction and stabilization, an important
application of feedback in quantum systems is adaptive measurement, and we
discuss the various applications of adaptive measurements. We finish by
describing specific examples of the application of feedback control to cooling
and state-preparation in nano-electro-mechanical systems and single trapped
atoms.
|
[
{
"version": "v1",
"created": "Tue, 2 May 2006 17:11:34 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Jacobs",
"Kurt",
""
]
] |
quant-ph/0605016
|
Xingxiang Zhou
|
Xingxiang Zhou and Ari Mizel
|
Quantum manipulation and simulation using Josephson junction arrays
| null |
Physica C 432, 59 (2005)
|
10.1016/j.physc.2005.07.010
| null |
quant-ph
| null |
We discuss the prospect of using quantum properties of large scale Josephson
junction arrays for quantum manipulation and simulation. We study the
collective vibrational quantum modes of a Josephson junction array and show
that they provide a natural and practical method for realizing a high quality
cavity for superconducting qubit based QED. We further demonstrate that by
using Josephson junction arrays we can simulate a family of problems concerning
spinless electron-phonon and electron-electron interactions. These protocols
require no or few controls over the Josephson junction array and are thus
relatively easy to realize given currently available technology.
|
[
{
"version": "v1",
"created": "Mon, 1 May 2006 21:03:23 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Zhou",
"Xingxiang",
""
],
[
"Mizel",
"Ari",
""
]
] |
quant-ph/0605017
|
Xingxiang Zhou
|
Xingxiang Zhou and Ari Mizel
|
Nonlinear coupling of nano mechanical resonators to Josephson quantum
circuits
| null | null |
10.1103/PhysRevLett.97.267201
| null |
quant-ph
| null |
We propose a technique to couple the position operator of a nano mechanical
resonator to a SQUID device by modulating its magnetic flux bias. By tuning the
magnetic field properly, either linear or quadratic couplings can be realized,
with a discretely adjustable coupling strength. This provides a way to realize
coherent nonlinear effects in a nano mechanical resonator by coupling it to a
Josephson quantum circuit. As an example, we show how squeezing of the nano
mechanical resonator state can be realized with this technique. We also propose
a simple method to measure the uncertainty in the position of the nano
mechanical resonator without quantum state tomography.
|
[
{
"version": "v1",
"created": "Mon, 1 May 2006 21:10:02 GMT"
}
] | 2015-06-26T00:00:00 |
[
[
"Zhou",
"Xingxiang",
""
],
[
"Mizel",
"Ari",
""
]
] |
quant-ph/0605018
|
Dragomir Z. Djokovic
|
Dragomir Z. Djokovic
|
Poincare series for local unitary invariants of mixed states of the
qubit-qutrit system
|
5 pages, no figures
| null | null | null |
quant-ph
| null |
We consider the mixed states of the bipartite quantum system with the first
party a qubit and the second a qutrit. The group of local unitary
transformations of the system, ignoring the overall phase factor, is the direct
product G of SU(2) and SU(3). We compute the simply graded Poincare series of
the algebra of G-invariant polynomial functions on the set of mixed states of
the system, and construct several low degree invariants.
|
[
{
"version": "v1",
"created": "Mon, 1 May 2006 22:11:15 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Djokovic",
"Dragomir Z.",
""
]
] |
quant-ph/0605019
|
Farhan Saif
|
Farhan Saif
|
Nature of quantum recurrences in coupled higher dimensional systems
| null | null |
10.1140/epjd/e2006-00091-5
| null |
quant-ph
| null |
We investigate recurrence phenomena in coupled two degrees of freedom
systems. It is shown that an initial well localized wave packet displays
recurrences even in the presence of coupling in these systems. We discuss the
interdependence of these time scales namely, classical period and quantum
revival time, and explain significance of initial conditions.
|
[
{
"version": "v1",
"created": "Mon, 1 May 2006 22:41:22 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Saif",
"Farhan",
""
]
] |
quant-ph/0605020
|
Dominic Meiser
|
D. Meiser, P. Meystre
|
The Super-Strong Coupling Regime of Cavity Quantum Electrodynamics
|
Figures rearranged and introduction rewritten
| null |
10.1103/PhysRevA.74.065801
| null |
quant-ph cond-mat.other physics.atom-ph
| null |
We describe a qualitatively new regime of cavity quantum electrodynamics, the
super strong coupling regime. This regime is characterized by atom-field
coupling strengths of the order of the free spectral range of the cavity,
resulting in a significant change in the spatial mode functions of the light
field. It can be reached in practice for cold atoms trapped in an optical
dipole potential inside the resonator. We present a nonperturbative scheme that
allows us to calculate the frequencies and linewidths of the modified field
modes, thereby providing a good starting point for a quantization of the
theory.
|
[
{
"version": "v1",
"created": "Tue, 2 May 2006 01:06:10 GMT"
},
{
"version": "v2",
"created": "Thu, 8 Jun 2006 23:43:51 GMT"
},
{
"version": "v3",
"created": "Fri, 7 Jul 2006 20:54:51 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Meiser",
"D.",
""
],
[
"Meystre",
"P.",
""
]
] |
quant-ph/0605021
|
Tohya Hiroshima
|
Tohya Hiroshima, Gerardo Adesso, and Fabrizio Illuminati
|
Monogamy inequality for distributed Gaussian entanglement
|
4 pages, no figures. Several improvements, proof made more
transparent, conclusions enriched
|
Phys. Rev. Lett. 98, 050503 (2007)
|
10.1103/PhysRevLett.98.050503
| null |
quant-ph cond-mat.stat-mech math-ph math.MP physics.optics
| null |
We show that for all n-mode Gaussian states of continuous variable systems,
the entanglement shared among n parties exhibits the fundamental monogamy
property. The monogamy inequality is proven by introducing the Gaussian tangle,
an entanglement monotone under Gaussian local operations and classical
communication, which is defined in terms of the squared negativity in complete
analogy with the case of n-qubit systems. Our results elucidate the structure
of quantum correlations in many-body harmonic lattice systems.
|
[
{
"version": "v1",
"created": "Tue, 2 May 2006 02:10:34 GMT"
},
{
"version": "v2",
"created": "Wed, 10 May 2006 10:55:06 GMT"
},
{
"version": "v3",
"created": "Wed, 7 Jun 2006 07:48:31 GMT"
},
{
"version": "v4",
"created": "Wed, 8 Nov 2006 12:20:44 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Hiroshima",
"Tohya",
""
],
[
"Adesso",
"Gerardo",
""
],
[
"Illuminati",
"Fabrizio",
""
]
] |
quant-ph/0605022
|
Julius Ruseckas
|
J. Ruseckas and B. Kaulakys
|
Quantum Trajectory method for the Quantum Zeno and anti-Zeno effects
|
12 figures, accepted for publication in Phys. Rev. A replaced with
single-spaced version
|
Phys. Rev. A 73, 052101 (2006)
|
10.1103/PhysRevA.73.052101
| null |
quant-ph
| null |
We perform stochastic simulations of the quantum Zeno and anti-Zeno effects
for two level system and for the decaying one. Instead of simple projection
postulate approach, a more realistic model of a detector interacting with the
environment is used. The influence of the environment is taken into account
using the quantum trajectory method. The simulation of the measurement for a
single system exhibits the probabilistic behavior showing the collapse of the
wave-packet. When a large ensemble is analysed using the quantum trajectory
method, the results are the same as those produced using the density matrix
method. The results of numerical calculations are compared with the analytical
expressions for the decay rate of the measured system and a good agreement is
found. Since the analytical expressions depend on the duration of the
measurement only, the agreement with the numerical calculations shows that
otherparameters of the model are not important.
|
[
{
"version": "v1",
"created": "Tue, 2 May 2006 06:51:43 GMT"
},
{
"version": "v2",
"created": "Fri, 5 May 2006 08:47:26 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Ruseckas",
"J.",
""
],
[
"Kaulakys",
"B.",
""
]
] |
quant-ph/0605023
|
Fu Jian
|
Jian Fu
|
Possible approach to improve sensitivity of a Michelson interferometer
|
8 pages, 3 figures, new version
| null |
10.1088/0256-307X/24/8/011
| null |
quant-ph
| null |
We propose a possible approach to achieve an 1/N sensitivity of Michelson
interferometer by using a properly designed random phase modulation. Different
from other approaches, the sensitivity improvement does not depend on
increasing optical powers or utilizing the quantum properties of light.
Moreover the requirements for optical losses and the quantum efficiencies of
photodetection systems might be lower than the quantum approaches and the
sensitivity improvement is frequency independent in all detection band.
|
[
{
"version": "v1",
"created": "Tue, 2 May 2006 08:59:51 GMT"
},
{
"version": "v2",
"created": "Wed, 3 May 2006 07:01:08 GMT"
},
{
"version": "v3",
"created": "Tue, 8 Aug 2006 15:27:29 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Fu",
"Jian",
""
]
] |
quant-ph/0605024
|
Akbar Fahmi Shakib
|
A. Fahmi
|
Entanglement-assisted Enhanced Information Transmission Over a Quantum
Channel with Correlated Noise; A General Expression
|
10 pages, 5 eps figure
| null | null | null |
quant-ph
| null |
Entanglement and entanglement-assisted are useful resources to enhance the
mutual information of the Pauli channels, when the noise on consecutive uses of
the channel has some partial correlations. In this paper, We study quantum
communication channels with correlated noise and derive a general expression
for the mutual information of quantum channel, for the product, maximally
entangled state coding and entanglement-assisted systems with correlated noise
in the Pauli quantum channels. Hence, we suggest more efficient coding in the
entanglement-assisted systems for the transmission of classical information and
derive a general expression for the entanglement-assisted classical capacity.
Our results show that in the presence of memory, a higher amount of classical
information is transmitted by two or four consecutive uses of
entanglement-assisted systems.
|
[
{
"version": "v1",
"created": "Tue, 2 May 2006 11:26:47 GMT"
},
{
"version": "v2",
"created": "Thu, 4 May 2006 05:24:01 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Fahmi",
"A.",
""
]
] |
quant-ph/0605025
|
Damaskinsky Evgeniy Viktorovich
|
E.V. Damaskinsky and M.A. Sokolov
|
Remarks on quantization of Pais-Uhlenbeck oscillators
| null | null |
10.1088/0305-4470/39/33/017
| null |
quant-ph
| null |
This work is concerned with a quantization of the Pais-Uhlenbeck oscillators
from the point of view of their multi-Hamiltonian structures. It is shown that
the 2n-th order oscillator with a simple spectrum is equivalent to the usual
anisotropic n - dimensional oscillator.
|
[
{
"version": "v1",
"created": "Tue, 2 May 2006 12:22:52 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Damaskinsky",
"E. V.",
""
],
[
"Sokolov",
"M. A.",
""
]
] |
quant-ph/0605026
|
Antonio Maria Scarfone
|
A. Lavagno, A.M. Scarfone, and P. Narayana Swamy
|
Classical and quantum q-deformed physical systems
|
9 pages, accepted for publication in "The European Physical Journal
C"
|
Eur.Phys.J.C47:253-261,2006
|
10.1140/epjc/s2006-02557-y
| null |
quant-ph cond-mat.other hep-th math.QA
| null |
On the basis of the non-commutative q-calculus, we investigate a
q-deformation of the classical Poisson bracket in order to formulate a
generalized q-deformed dynamics in the classical regime. The obtained
q-deformed Poisson bracket appears invariant under the action of the
q-symplectic group of transformations. In this framework we introduce the
q-deformed Hamilton's equations and we derive the evolution equation for some
simple q-deformed mechanical systems governed by a scalar potential dependent
only on the coordinate variable. It appears that the q-deformed Hamiltonian,
which is the generator of the equation of motion, is generally not conserved in
time but, in correspondence, a new constant of motion is generated. Finally, by
following the standard canonical quantization rule, we compare the well known
q-deformed Heisenberg algebra with the algebra generated by the q-deformed
Poisson bracket.
|
[
{
"version": "v1",
"created": "Tue, 2 May 2006 12:27:41 GMT"
}
] | 2009-01-07T00:00:00 |
[
[
"Lavagno",
"A.",
""
],
[
"Scarfone",
"A. M.",
""
],
[
"Swamy",
"P. Narayana",
""
]
] |
quant-ph/0605027
|
Minh Dung Dang
|
Minh-Dung Dang
|
Coin-Flipping-based Quantum Oblivious Transfer
|
Withdrawal
| null | null | null |
quant-ph
| null |
When submitting ``Coin-Flipping-based Quantum Oblivious Transfer''
(quant-ph/0605027v4) to Indocrypt-2006, I received valuable reviews. Due to the
attacks in these reviews, my major protocols, for cheat-sensitive and
coin-flipping-based 2-1 oblivious transfers, are insecure. I would have
withdrawn the paper. But I think I'd rather post the attacks made by the
reviewer. Besides, as ``coin-flipping-based 2-1 OT'' is an important case-study
in ``Two-party Models and the No-go Theorems'' (quant-ph/0608165), the paper is
also touched by the attack. It will be reconsidered, and the case-study will be
eliminated from it. I would like to thank the ``anonymous'' reviewer for those
valuable attacks and comments.
|
[
{
"version": "v1",
"created": "Tue, 2 May 2006 16:25:05 GMT"
},
{
"version": "v2",
"created": "Tue, 9 May 2006 15:50:29 GMT"
},
{
"version": "v3",
"created": "Mon, 26 Jun 2006 14:47:01 GMT"
},
{
"version": "v4",
"created": "Mon, 21 Aug 2006 08:16:19 GMT"
},
{
"version": "v5",
"created": "Tue, 26 Sep 2006 22:00:23 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Dang",
"Minh-Dung",
""
]
] |
quant-ph/0605028
|
Ralph Beil
|
R. G. Beil
|
Correspondence of Bell State and One-Particle State Transformations
|
19 pages, 1 figure
| null | null | null |
quant-ph
| null |
There is a direct correspondence between two-particle, entangled quantum
states, for example, Bell states, and the relative values of the component
one-particle states. This leads to a new rationale for quantum computing which
makes use of sequential processing of one-particle states rather than the
parallel processing associated with multiparticle states. It is shown that
deterministic transformations can correspond to certain Bell state operations.
There are some implications for the continuing discussion of quantum realism
and entanglement. A principle of relative realism is advocated.
|
[
{
"version": "v1",
"created": "Tue, 2 May 2006 16:34:41 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Beil",
"R. G.",
""
]
] |
quant-ph/0605029
|
Roberto Passante
|
S. Spagnolo, R. Passante and L. Rizzuto
|
Field fluctuations near a conducting plate and Casimir-Polder forces in
the presence of boundary conditions
|
10 pages
| null |
10.1103/PhysRevA.73.062117
| null |
quant-ph
| null |
We consider vacuum fluctuations of the quantum electromagnetic field in the
presence of an infinite and perfectly conducting plate. We evaluate how the
change of vacuum fluctuations due to the plate modifies the Casimir-Polder
potential between two atoms placed near the plate. We use two different methods
to evaluate the Casimir-Polder potential in the presence of the plate. They
also give new insights on the role of boundary conditions in the Casimir-Polder
interatomic potential, as well as indications for possible generalizations to
more complicated boundary conditions.
|
[
{
"version": "v1",
"created": "Tue, 2 May 2006 18:48:00 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Spagnolo",
"S.",
""
],
[
"Passante",
"R.",
""
],
[
"Rizzuto",
"L.",
""
]
] |
quant-ph/0605030
|
Markus Mueller
|
Markus Mueller
|
Strongly Universal Quantum Turing Machines and Invariance of Kolmogorov
Complexity
|
18 pages, 1 figure. The operation R is now really a quantum operation
(it was not before); corrected some typos, III.B more readable, Conjecture
3.15 is now a theorem
|
IEEE Trans. Inf. Th., Vol. 54/2 pp. 763-780 (2008)
|
10.1109/TIT.2007.913263
| null |
quant-ph cs.IT math-ph math.IT math.MP
| null |
We show that there exists a universal quantum Turing machine (UQTM) that can
simulate every other QTM until the other QTM has halted and then halt itself
with probability one. This extends work by Bernstein and Vazirani who have
shown that there is a UQTM that can simulate every other QTM for an arbitrary,
but preassigned number of time steps. As a corollary to this result, we give a
rigorous proof that quantum Kolmogorov complexity as defined by Berthiaume et
al. is invariant, i.e. depends on the choice of the UQTM only up to an additive
constant. Our proof is based on a new mathematical framework for QTMs,
including a thorough analysis of their halting behaviour. We introduce the
notion of mutually orthogonal halting spaces and show that the information
encoded in an input qubit string can always be effectively decomposed into a
classical and a quantum part.
|
[
{
"version": "v1",
"created": "Tue, 2 May 2006 20:27:34 GMT"
},
{
"version": "v2",
"created": "Fri, 11 Aug 2006 14:35:05 GMT"
},
{
"version": "v3",
"created": "Sat, 11 Aug 2007 17:00:35 GMT"
}
] | 2016-11-18T00:00:00 |
[
[
"Mueller",
"Markus",
""
]
] |
quant-ph/0605031
|
Michael B. Weissman
|
M. B. Weissman
|
Irreversibility in Collapse-Free Quantum Dynamics and the Second Law of
Thermodynamics
|
13 pages
| null | null | null |
quant-ph
| null |
Proposals to solve the problems of quantum measurement via non-linear
CPT-violating modifications of quantum dynamics are argued to provide a
possible fundamental explanation for the irreversibility of statistical
mechanics as well. The argument is expressed in terms of collapse-free
accounts. The reverse picture, in which statistical irreversibility generates
quantum irreversibility, is argued to be less satisfactory because it leaves
the Born probability rule unexplained.
|
[
{
"version": "v1",
"created": "Tue, 2 May 2006 21:13:25 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Weissman",
"M. B.",
""
]
] |
quant-ph/0605032
|
Jae-Seung Lee
|
Jae-Seung Lee and A. K. Khitrin
|
Projective measurement in nuclear magnetic resonance
|
9 pages incluing 3 figures
|
Appl. Phys. Lett. 89, 074105 (2006)
|
10.1063/1.2337158
| null |
quant-ph
| null |
It is demonstrated that nuclear magnetic resonance experiments using
pseudopure spin states can give possible outcomes of projective quantum
measurement and probabilities of such outcomes. The physical system is a
cluster of six dipolar-coupled nuclear spins of benzene in a liquid-crystalline
matrix. For this system with the maximum total spin S=3, the results of
measuring $S_X$ are presented for the cases when the state of the system is one
of the eigenstates of $S_Z$.
|
[
{
"version": "v1",
"created": "Tue, 2 May 2006 21:37:30 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Lee",
"Jae-Seung",
""
],
[
"Khitrin",
"A. K.",
""
]
] |
quant-ph/0605033
|
Sangchul Oh
|
Sangchul Oh and Jaewan Kim
|
Entanglement between qubits induced by a common environment with a gap
|
accepted for publication in Physical Review A
|
Phys. Rev. A 73, 062306 (2006)
|
10.1103/PhysRevA.73.062306
| null |
quant-ph
| null |
We study a system of two qubits interacting with a common environment,
described by a two-spin boson model. We demonstrate two competing roles of the
environment: inducing entanglement between the two qubits and making them
decoherent. For the environment of a single harmonic oscillator, if its
frequency is commensurate with the induced two-qubit coupling strength, the two
qubits could be maximally entangled and the environment could be separable. In
the case of the environment of a bosonic bath, the gap of its spectral density
function is essential to generate entanglement between two qubits at
equilibrium and for it to be used as a quantum data bus.
|
[
{
"version": "v1",
"created": "Wed, 3 May 2006 06:29:08 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Oh",
"Sangchul",
""
],
[
"Kim",
"Jaewan",
""
]
] |
quant-ph/0605034
|
Marek Zukowski
|
Marek Zukowski
|
On the Paradoxical Book of Bell
|
Replacement. The critical missing NOT is put into footnote 1. Note
that in the published version NOT is still missing
|
Stud. Hist. Phil. Mod. Phys. 36, 566 (2005)
| null | null |
quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This is an essay-review on a recently re-issued book of John Bell "Speakable
and Unspeakable in Quantum Mechanics". The discussion concentrates around the
Bell Theorem, its assumptions, consequences and frequent overinterpretations.
|
[
{
"version": "v1",
"created": "Wed, 3 May 2006 07:45:34 GMT"
},
{
"version": "v2",
"created": "Thu, 22 Jan 2015 21:10:17 GMT"
}
] | 2015-01-26T00:00:00 |
[
[
"Zukowski",
"Marek",
""
]
] |
quant-ph/0605035
|
Moiseev Sergei Andreevich
|
S.A.Moiseev
|
Quantum memory protocol in QED cavity based on Photon echo
|
5 pages, 1 figure
| null | null | null |
quant-ph
| null |
A new protocol of the optical quantum memory based on the resonant
interactions of the multi atomic system with a cavity light mode is proposed.
The quantum memory is realized using a controllable inversion of the
inhomogeneous broadening of the resonant atomic transition and impact
interaction (on request) of additional short 2 - laser pulse resonant to an
adjacent atomic transition. We demonstrate that the quantum memory protocol is
effective for arbitrary storage time and can be used for new quantum
manipulations with transient entangled states in the field-atoms evolution. The
effect of the fast absorption and emission of the light field is predicted.
|
[
{
"version": "v1",
"created": "Wed, 3 May 2006 09:50:06 GMT"
},
{
"version": "v2",
"created": "Thu, 28 Sep 2006 12:25:49 GMT"
},
{
"version": "v3",
"created": "Wed, 4 Oct 2006 13:04:57 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Moiseev",
"S. A.",
""
]
] |
quant-ph/0605036
|
Heinz-Peter Breuer
|
Heinz-Peter Breuer
|
Optimal entanglement criterion for mixed quantum states
|
4 pages, no figures, replaced by published version (minor changes),
Journal-reference added
|
Phys. Rev. Lett. 97, 080501 (2006)
|
10.1103/PhysRevLett.97.080501
| null |
quant-ph
| null |
We develop a strong and computationally simple entanglement criterion. The
criterion is based on an elementary positive map Phi which operates on state
spaces with even dimension N >= 4. It is shown that Phi detects many entangled
states with positive partial transposition (PPT) and that it leads to a class
of optimal entanglement witnesses. This implies that there are no other
witnesses which can detect more entangled PPT states. The map Phi yields a
systematic method for the explicit construction of high-dimensional manifolds
of bound entangled states.
|
[
{
"version": "v1",
"created": "Wed, 3 May 2006 11:20:10 GMT"
},
{
"version": "v2",
"created": "Tue, 22 Aug 2006 20:21:42 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Breuer",
"Heinz-Peter",
""
]
] |
quant-ph/0605037
|
Marcus Aguiar de
|
M.V.S. Bonanca and M.A.M. de Aguiar
|
Quantum Dissipation and Decoherence via Interaction with Low-Dimensional
Chaos: a Feynman-Vernon Approach
|
31 pages, 4 figures
|
Phys. Rev. A 74 (2006) 12105.
|
10.1103/PhysRevA.74.012105
| null |
quant-ph
| null |
We study the effects of dissipation and decoherence induced on a harmonic
oscillator by the coupling to a chaotic system with two degrees of freedom.
Using the Feynman-Vernon approach and treating the chaotic system
semiclassically we show that the effects of the low dimensional chaotic
environment are in many ways similar to those produced by thermal baths. The
classical correlation and response functions play important roles in both
classical and quantum formulations. Our results are qualitatively similar to
the high temperature regime of the Caldeira-Leggett model.
|
[
{
"version": "v1",
"created": "Wed, 3 May 2006 12:16:36 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Bonanca",
"M. V. S.",
""
],
[
"de Aguiar",
"M. A. M.",
""
]
] |
quant-ph/0605038
|
Fedor Jelezko
|
T. Gaebel, M. Domhan, I. Popa, C. Wittmann, P. Neumann, F. Jelezko,
J.R. Rabeau, N. Stavrias, A. D. Greentree, S. Prawer, J. Meijer, J. Twamley,
P. R. Hemmer, and J. Wrachtrup
|
Room temperature coherent control of coupled single spins in solid
| null |
Nature Physics 2: 408-413 (2006)
|
10.1038/nphys318
| null |
quant-ph
| null |
Coherent coupling between single quantum objects is at the heart of modern
quantum physics. When coupling is strong enough to prevail over decoherence, it
can be used for the engineering of correlated quantum states. Especially for
solid-state systems, control of quantum correlations has attracted widespread
attention because of applications in quantum computing. Such coherent coupling
has been demonstrated in a variety of systems at low temperature1, 2. Of all
quantum systems, spins are potentially the most important, because they offer
very long phase memories, sometimes even at room temperature. Although precise
control of spins is well established in conventional magnetic resonance3, 4,
existing techniques usually do not allow the readout of single spins because of
limited sensitivity. In this paper, we explore dipolar magnetic coupling
between two single defects in diamond (nitrogen-vacancy and nitrogen) using
optical readout of the single nitrogen-vacancy spin states. Long phase memory
combined with a defect separation of a few lattice spacings allow us to explore
the strong magnetic coupling regime. As the two-defect system was well-isolated
from other defects, the long phase memory times of the single spins was not
diminished, despite the fact that dipolar interactions are usually seen as
undesirable sources of decoherence. A coherent superposition of spin pair
quantum states was achieved. The dipolar coupling was used to transfer spin
polarisation from a nitrogen-vacancy centre spin to a nitrogen spin, with
optical pumping of a nitrogen-vacancy centre leading to efficient
initialisation. At the level anticrossing efficient nuclear spin polarisation
was achieved. Our results demonstrate an important step towards controlled spin
coupling and multi-particle entanglement in the solid state.
|
[
{
"version": "v1",
"created": "Wed, 3 May 2006 12:47:09 GMT"
}
] | 2015-06-26T00:00:00 |
[
[
"Gaebel",
"T.",
""
],
[
"Domhan",
"M.",
""
],
[
"Popa",
"I.",
""
],
[
"Wittmann",
"C.",
""
],
[
"Neumann",
"P.",
""
],
[
"Jelezko",
"F.",
""
],
[
"Rabeau",
"J. R.",
""
],
[
"Stavrias",
"N.",
""
],
[
"Greentree",
"A. D.",
""
],
[
"Prawer",
"S.",
""
],
[
"Meijer",
"J.",
""
],
[
"Twamley",
"J.",
""
],
[
"Hemmer",
"P. R.",
""
],
[
"Wrachtrup",
"J.",
""
]
] |
quant-ph/0605039
|
W. M. Stuckey
|
Michael Silberstein, Michael Cifone and W.M. Stuckey
|
An Argument for 4D Blockworld from a Geometric Interpretation of
Non-relativistic Quantum Mechanics
|
39 pp text, 20 figures. Submitted to Relativity and the
Dimensionality of the World (Springer-Verlag)
| null | null | null |
quant-ph
| null |
We use a new distinctly "geometrical" interpretation of non-relativistic
quantum mechanics (NRQM) to argue for the fundamentality of the 4D blockworld
ontology. Our interpretation rests on two formal results: Kaiser, Bohr &
Ulfbeck and Anandan showed independently that the Heisenberg commutation
relations of NRQM follow from the relativity of simultaneity (RoS) per the
Poincare Lie algebra, and Bohr, Ulfbeck & Mottelson showed that the density
matrix for a particular NRQM experimental outcome may be obtained from the
spacetime symmetry group of the experimental configuration. Together these
formal results imply that contrary to accepted wisdom, NRQM, the measurement
problem and so-called quantum non-locality do not provide reasons to abandon
the 4D blockworld implication of RoS. After discussing the full philosophical
implications of these formal results, we motivate and derive the Born rule in
the context of our ontology of spacetime relations via Anandan. Finally, we
apply our explanatory and descriptive methodology to a particular experimental
set-up (the so-called "quantum liar experiment") and thereby show how the
blockworld view is not only consistent with NRQM, not only an implication of
our geometrical interpretation of NRQM, but it is necessary in a non-trivial
way for explaining quantum interference and "non-locality" from the spacetime
perspective.
|
[
{
"version": "v1",
"created": "Wed, 3 May 2006 14:27:46 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Silberstein",
"Michael",
""
],
[
"Cifone",
"Michael",
""
],
[
"Stuckey",
"W. M.",
""
]
] |
quant-ph/0605040
|
Todd Fugleberg
|
K. Choy, G. Passante, D. Ahrensmeier, M.E. Carrington, T. Fugleberg,
R. Kobes and G. Kunstatter
|
The Dynamics of Entanglement in the Adiabatic Search and Deutsch
Algorithms
|
29 pages, 25 figures
| null |
10.1139/P07-084
| null |
quant-ph
| null |
The goal of this paper is to study the effect of entanglement on the running
time of a quantum computation. Adiabatic quantum computation is suited to this
kind of study, since it allows us to explicitly calculate the time evolution of
the entanglement throughout the calculation. On the other hand however, the
adiabatic formalism makes it impossible to study the roles of entanglement and
fidelity separately, which means that results have to be interpreted carefully.
We study two algorithms: the search algorithm and the Deutsch-Jozsa algorithm.
We find some evidence that entanglement can be considered a resource in quantum
computation.
|
[
{
"version": "v1",
"created": "Wed, 3 May 2006 17:04:42 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Choy",
"K.",
""
],
[
"Passante",
"G.",
""
],
[
"Ahrensmeier",
"D.",
""
],
[
"Carrington",
"M. E.",
""
],
[
"Fugleberg",
"T.",
""
],
[
"Kobes",
"R.",
""
],
[
"Kunstatter",
"G.",
""
]
] |
quant-ph/0605041
|
Ashwin Nayak
|
Ashwin Nayak (1), Pranab Sen (2) ((1) U. Waterloo & Perimeter, (2)
TIFR)
|
Invertible Quantum Operations and Perfect Encryption of Quantum States
|
9 pages. Version 3 has minor edits, a correction to Theorem 2.2, and
a proof sketch.Author affiliation updated.Version 4 has an additional
reference. To appear in QIC
| null | null | null |
quant-ph cs.CR cs.IT math.IT
| null |
In this note, we characterize the form of an invertible quantum operation,
i.e., a completely positive trace preserving linear transformation (a CPTP map)
whose inverse is also a CPTP map. The precise form of such maps becomes
important in contexts such as self-testing and encryption. We show that these
maps correspond to applying a unitary transformation to the state along with an
ancilla initialized to a fixed state, which may be mixed.
The characterization of invertible quantum operations implies that one-way
schemes for encrypting quantum states using a classical key may be slightly
more general than the ``private quantum channels'' studied by Ambainis, Mosca,
Tapp and de Wolf (FOCS 2000). Nonetheless, we show that their results, most
notably a lower bound of 2n bits of key to encrypt n quantum bits, extend in a
straightforward manner to the general case.
|
[
{
"version": "v1",
"created": "Wed, 3 May 2006 17:29:56 GMT"
},
{
"version": "v2",
"created": "Thu, 20 Jul 2006 16:03:24 GMT"
},
{
"version": "v3",
"created": "Thu, 21 Sep 2006 05:22:20 GMT"
},
{
"version": "v4",
"created": "Thu, 2 Nov 2006 18:15:14 GMT"
}
] | 2018-03-22T00:00:00 |
[
[
"Nayak",
"Ashwin",
""
],
[
"Sen",
"Pranab",
""
]
] |
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