Matt's arXiv selection: week ending 16 May 2008.

From: Matthew Davis <mdavis_at_physics.uq.edu.au>
Date: Mon, 02 Jun 2008 17:54:20 +1000

The following message was sent to the matts_arxiv list by Matthew Davis <mdavis_at_physics.uq.edu.au>

Hi everyone,

This week there are 27 new preprints and 11 replacements.

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arXiv:0805.1358
Date: Fri, 9 May 2008 14:32:47 GMT (11kb)

Title: Phonon background versus analogue Hawking radiation in Bose-Einstein
condensates
Authors: S. Wuester
Categories: cond-mat.other gr-qc
Comments: 4 pages, no figures
\\
We determine the feasibility of detecting analogue Hawking radiation in a
Bose-Einstein condensate in the presence of atom loss induced heating. We find
that phonons created by three-body losses overshadow those due to analogue
Hawking radiation. To overcome this problem, three-body losses may have to be
suppressed, for example as proposed by Search et al. [Phys. Rev. Lett. 92
140401 (2004)]. The reduction of losses to a few percent of their normal rate
is typically sufficient to suppress the creation of loss phonons on the time
scale of a fast analogue Hawking phonon detection.
\\ ( http://arxiv.org/abs/0805.1358 , 11kb)
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arXiv:0805.1256
Date: Fri, 9 May 2008 00:23:42 GMT (843kb,D)

Title: Dissipation-driven quantum phase transitions in collective spin systems
Authors: S. Morrison and A. S. Parkins
Categories: quant-ph
Comments: 13 pages, 17 figures
\\
We consider two different collective spin systems subjected to strong
dissipation -- on the same scale as interaction strengths and external fields
-- and show that either continuous or discontinuous dissipative quantum phase
transitions can occur as the dissipation strength is varied. First, we consider
a well known model of cooperative resonance fluorescence that can exhibit a
second-order quantum phase transition, and analyze the entanglement properties
near the critical point. Next, we examine a dissipative version of the
Lipkin-Meshkov-Glick interacting collective spin model, where we find that
either first- or second-order quantum phase transitions can occur, depending
only on the ratio of the interaction and external field parameters. We give
detailed results and interpretation for the steady state entanglement in the
vicinity of the critical point, where it reaches a maximum. For the first-order
transition we find that the semiclassical steady states exhibit a region of
bistability and we show that homodyne spectra of the system provide a clear
signature of this behaviour.
\\ ( http://arxiv.org/abs/0805.1256 , 843kb)
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arXiv:0805.1402
Date: Fri, 9 May 2008 19:47:31 GMT (216kb)

Title: QND measurements and state preparation in quantum gases by light
detection
Authors: Igor B. Mekhov, Helmut Ritsch
Categories: quant-ph
Comments: 4 pages, 3 figures
\\
We consider light scattering from ultracold atoms trapped in an optical
lattice into a cavity. The measurement of photons leaking out the cavity
provides a quantum nondemolition (QND) access to various atomic variables.
Depending on the chosen geometry the time resolved light detection projects the
atomic quantum state to various atom-number squeezed and Schroedinger cat
states. Modifications of the atomic and light properties at a single quantum
trajectory are demonstrated. The quantum structure of final states can be
revealed by further observations of the same sample.
\\ ( http://arxiv.org/abs/0805.1402 , 216kb)
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arXiv:0805.1408
Date: Fri, 9 May 2008 20:14:32 GMT (433kb,D)

Title: Solids and supersolids of three-body interacting polar molecules in an
optical lattice
Authors: Kai P. Schmidt, Julien Dorier, Andreas Laeuchli
Categories: cond-mat.str-el cond-mat.stat-mech
Comments: 4+ pages, 4 figures
\\
We study the physics of cold polar molecules loaded into an optical lattice
in the regime of strong three-body interactions, as put forward recently by
B\"uchler [Nat. Phys. 3, 726 (2007)]. To this end quantum Monte Carlo
simulations, exact diagonalization and a semiclassical approach are used to
explore hardcore bosons on the two-dimensional square lattice which interact
solely by long ranged three-body terms. The resulting phase diagram shows a
sequence of solid and supersolid phases. Our findings are directly relevant for
future experimental implementations and open a new route towards the discovery
of a lattice supersolid phase in experiment.
\\ ( http://arxiv.org/abs/0805.1408 , 433kb)
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arXiv:0805.1507
Date: Sun, 11 May 2008 04:35:55 GMT (324kb)

Title: Maximizing the Neel temperature of fermions in a simple-cubic optical
lattice
Authors: C.J.M. Mathy and David A. Huse
Categories: cond-mat.str-el
Comments: 4 pages, 3 figures
\\
For a simple-cubic optical lattice with lattice spacing d, occupied by two
species of fermionic atoms of mass m that interact repulsively, we ask what
conditions maximize the Neel temperature in the Mott insulating phase at
density one atom per site, with equal numbers of the two species. This maximum
occurs near the edge of the regime where the system is well-approximated by the
usual Hubbard model. The correction to the Hubbard-model approximation that
produces a direct'' ferromagnetic interaction between atoms in
nearest-neighbor Wannier orbitals is the leading term that limits how high the
Neel temperature can be made.
\\ ( http://arxiv.org/abs/0805.1507 , 324kb)
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arXiv:0805.1641
Date: Mon, 12 May 2008 13:54:15 GMT (626kb)

Title: Breathing mode frequencies of a rotating Fermi gas in the BCS-BEC
crossover region
Authors: Theja N. De Silva
Categories: cond-mat.other
Comments: 6 pages, 8 fiqures
\\
We study the breathing mode frequencies of a rotating Fermi gas trapped in a
harmonic plus radial quartic potential. We find that as the radial
anharmonicity increases, the lowest order radial mode frequency increases while
the next lowest order radial mode frequency decreases. Then at a critical
anharmonicity, these two modes merge and beyond this merge the cloud is
unstable against the oscillations. The critical anharmonicity depends on both
rotational frequency and the chemical potential. As a result of the large
chemical potential in the BCS regime, even with a weak anharmonicity the lowest
order mode frequency increases with decreasing the attractive interaction. For
large enough anharmonicities in the weak coupling BCS limit, we find that the
excitation of the breathing mode frequencies make the atomic cloud unstable.
\\ ( http://arxiv.org/abs/0805.1641 , 626kb)
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arXiv:0805.1416
Date: Fri, 9 May 2008 20:36:33 GMT (877kb)

Title: Novel Coherent Optical Medium Based on Buffer-Gas-Cooled Rb Vapor
Authors: Tao Hong, Alexey V. Gorshkov, David Patterson, Alexander S. Zibrov,
John M. Doyle, Mikhail D. Lukin, and Mara G. Prentiss
Categories: quant-ph
Comments: 4 pages, 4 figures
\\
We demonstrate a novel coherent optical medium with high optical depth and
low Doppler broadening that offers metastable states with low collisional and
motional decoherence. In our approach, helium buffer gas cools 87Rb atoms to
below 7 K, while at the same time slowing atom diffusion. We demonstrate that
electromagnetically induced transparency (EIT) allows 50% transmission in a
medium with initial OD > 70. Slow pulse propagation experiments in this medium
yield delays exceeding initial pulse duration by a factor > 25. Efficient
four-wave mixing is observed in the high-OD regime, resulting in a pronounced
modification of the atomic optical response.
\\ ( http://arxiv.org/abs/0805.1416 , 877kb)
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arXiv:0805.1576
Date: Mon, 12 May 2008 02:51:49 GMT (13kb)

Title: Manifestation of Hamiltonian chaos in an open quantum system with
ballistic atoms in an optical lattice
Authors: V.Yu. Argonov and S.V. Prants
Categories: quant-ph
Comments: 4 pages, 1 figure
\\
Manifestation of dynamical instability and Hamiltonian chaos in the
fundamental near-resonant matter-radiation interaction has been found
analitically and in a Monte Carlo simulation in the behavior of atoms moving in
a rigid optical lattice. Character of diffusion of spontaneously emitting atoms
changes abruptly in the range of the values of parameters and initial
conditions where their Hamiltonian dynamics is shown to be chaotic
\\ ( http://arxiv.org/abs/0805.1576 , 13kb)
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arXiv:0805.1714
Date: Mon, 12 May 2008 19:08:19 GMT (316kb)

Title: Light scattering and localization in an ultracold and dense atomic
system
Authors: I.M. Sokolov, M.D. Kupriyanova, D.V. Kupriyanov, M.D. Havey
Categories: quant-ph
\\
The quantum optical response of high density ultracold atomic systems is
critical to a wide range of fundamentally and technically important physical
processes. These include quantum image storage, optically based quantum
repeaters and ultracold molecule formation. We present here a microscopic
analysis of the light scattering on such a system, and we compare it with a
corresponding description based on macroscopic Maxwell theory. Results are
discussed in the context of the spectral resonance structure, time-dependent
response, and the light localization problem.
\\ ( http://arxiv.org/abs/0805.1714 , 316kb)
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arXiv:0805.1770
Date: Tue, 13 May 2008 02:19:46 GMT (24kb)

Title: D-anyons: one-dimensional anyons with competing $\delta$-function and
derivative $\delta$-function potentials
Authors: M. T. Batchelor, X.-W. Guan and A. Kundu
Categories: cond-mat.stat-mech
Comments: 9 pages, 2 figures
\\
We propose an exactly solvable model of anyons confined to one dimension with
competing $\delta$-function and derivative $\delta$-function interaction
potentials. The Bethe ansatz equations are derived in terms of the $N$-particle
sector for the quantum anyonic field model of the generalized derivative
nonlinear Schr\"{o}dinger equation. This more general anyon model exhibits
richer physics than that of the recently studied one-dimensional model of
$\delta$-function interacting anyons. We show that the anyonic signature is
inextricably related to the velocities of the colliding particles and the
pairwise dynamical interaction between particles.
\\ ( http://arxiv.org/abs/0805.1770 , 24kb)
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arXiv:0805.1784
Date: Tue, 13 May 2008 06:30:13 GMT (41kb)

Title: Pairing in spin polarized two-species fermionic mixtures with mass
asymmetry
Authors: S. A. Silotri, D. Angom, H. Mishra and Amruta Mishra
Categories: cond-mat.supr-con cond-mat.other
Comments: 8 pages and 6 figures
\\
We discuss on the pairing mechanism of fermions with mismatch in their fermi
momenta due to a mass asymmetry. Using a variational ansatz for the ground
state we also discuss the BCS -BEC crossover of this system. It is shown that
the breached pairing solution with a single fermi surface is stable in the BEC
regime. We also include the temperatures effect on the fermion pairing within
an approximation that is valid for temperatures much below the critical
temperature.
\\ ( http://arxiv.org/abs/0805.1784 , 41kb)
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arXiv:0805.1817
Date: Tue, 13 May 2008 10:30:37 GMT (189kb)

Title: Atom Chip Diffraction of Bose-Einstein Condensates: The Role of
Inter-Atomic Interactions
Authors: T. E. Judd, R. G. Scott, T. M. Fromhold
Categories: cond-mat.other
Comments: 5 pages, 4 figures
\\
We use supercomputer simulations to show that inter-atomic interactions can
strongly affect the phase evolution of Bose-Einstein condensates that are
diffracted from atom chips, thereby explaining recent experiments. Interactions
broaden and depopulate non-central diffraction orders, meaning that the
experiments cannot be fully described by non-interacting theories.
Consequently, interferometers that use many interacting atoms to enhance
sensitivity are highly nonlinear devices requiring complex calibration. We
identify device geometries required to approximate non-interacting behavior.
\\ ( http://arxiv.org/abs/0805.1817 , 189kb)
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arXiv:0805.1832
Date: Tue, 13 May 2008 12:28:48 GMT (164kb)

Title: Bosonic amplification of noise-induced suppression of phase diffusion
Authors: Y. Khodorkovsky, G. Kurizki, A. Vardi
Categories: cond-mat.other
Comments: 5 pages, 4 figures
\\
We study the effect of noise-induced dephasing on collisional phase-diffusion
in the two-site Bose-Hubbard model. Dephasing of the quasi-momentum modes may
slow down phase-diffusion in the quantum Zeno limit. Remarkably, the degree of
suppression is enhanced by a bosonic factor of order $N/\log{N}$ as the
particle number $N$ increases.
\\ ( http://arxiv.org/abs/0805.1832 , 164kb)
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arXiv:0805.1896
Date: Tue, 13 May 2008 17:03:49 GMT (7006kb)

Title: Condensed Matter Physics with Cold Polar Molecules
Authors: G. Pupillo, A. Micheli, H.P. B\"uchler, and P. Zoller
Categories: cond-mat.other cond-mat.stat-mech
Comments: Chapter of the book: "Cold molecules: Creation and applications",
edited by R. V. Krems, B. Friedrich and W. C. Stwalley, and published by
Taylor & Francis
\\
In this review chapter we focus on the many-body dynamics of cold polar
molecules in the strongly interacting regime. In particular, we discuss a
toolbox for engineering many-body Hamiltonians based on the manipulation of the
electric dipole moments of the molecules, and thus of molecular interactions,
using external static and microwave fields. This forms the basis for the
realization of novel quantum phases in these systems.
\\ ( http://arxiv.org/abs/0805.1896 , 7006kb)
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arXiv:0803.2712
Date: Wed, 19 Mar 2008 09:51:39 GMT (691kb)

Title: Nonlinear spectroscopy of photons bound to one atom
Authors: I. Schuster, A. Kubanek, A. Fuhrmanek, T. Puppe, P.W.H. Pinkse, K.
Murr and G. Rempe
Categories: quant-ph cond-mat.other
Comments: 7 figures, Nature Physics
Journal-ref: Nature Physics 4, 382-385 (2008)
DOI: 10.1038/nphys940
\\
Optical nonlinearities typically require macroscopic media, thereby making
their implementation at the quantum level an outstanding challenge. Here we
demonstrate a nonlinearity for one atom enclosed by two highly reflecting
mirrors. We send laser light through the input mirror and record the light from
the output mirror of the cavity. For weak laser intensity, we find the
vacuum-Rabi resonances. But for higher intensities, we find an additional
resonance. It originates from the fact that the cavity can accommodate only an
integer number of photons and that this photon number determines the
characteristic frequencies of the coupled atom-cavity system. We selectively
excite such a frequency by depositing at once two photons into the system and
find a transmission which increases with the laser intensity squared. The
nonlinearity differs from classical saturation nonlinearities and is direct
spectroscopic proof of the quantum nature of the atom-cavity system. It
provides a photon-photon interaction by means of one atom, and constitutes a
step towards a two-photon gateway or a single-photon transistor.
\\ ( http://arxiv.org/abs/0803.2712 , 691kb)
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arXiv:0805.1812
Date: Tue, 13 May 2008 10:52:40 GMT (83kb)

Title: Two-particle states in the Hubbard model
Authors: Manuel Valiente, David Petrosyan
Categories: quant-ph
Comments: 3 pages, 1 figure
\\
We consider a pair of bosonic particles in a 1D tight-binding periodic
potential described by the Hubbard model with attractive or repulsive on-site
interaction. We derive explicit analytic expressions for the two-particle
states, which can be classified as (i) scattering states of asymptotically free
particles and (ii) interaction-bound dimer states. Our results provide a very
transparent framework to understand the properties of interacting pairs of
particles in a lattice.
\\ ( http://arxiv.org/abs/0805.1812 , 83kb)
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arXiv:0805.1948
Date: Wed, 14 May 2008 00:58:43 GMT (226kb,D)

Title: Avalanches of Bose-Einstein Condensates in Leaking Optical Lattices
Authors: G. S. Ng, H. Hennig, R. Fleischmann, T. Kottos, and T. Geisel
Categories: cond-mat.stat-mech cond-mat.other
Comments: 7 pages and 3 figures
\\
One of the most fascinating experimental achievements of the last decade was
the realization of Bose-Einstein Condensation (BEC) of ultra-cold atoms in
optical lattices (OL's). The extraordinary level of control over these
structures allows us to investigate complex solid state phenomena and the
emerging field of atomtronics'' promises a new generation of nanoscale
devices. It is therefore of fundamental and technological importance to
understand their dynamical properties. Here we study the outgoing atomic flux
of BECs loaded in an one-dimensional OL with leaking edges, using a mean field
description provided by the Discrete Non-Linear Schrodinger Equation (DNLSE).
We demonstrate that the atom population inside the OL decays in avalanches of
size $J$. For intermediate values of the interatomic interaction strength their
distribution ${\cal P}(J)$ follows a power law i.e. ${\cal P}(J)\sim1/J^{\alpha}$ characterizing systems at phase transition. This scale
free behaviour of ${\cal P}(J)$ reflects the complexity and the hierarchical
structure of the underlying classical mixed phase space. Our results are
relevant in a variety of contexts (whenever DNLSE is adequate), most
prominently the light emmitance from coupled non-linear optics waveguides.
\\ ( http://arxiv.org/abs/0805.1948 , 226kb)
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arXiv:0805.1988
Date: Wed, 14 May 2008 07:38:11 GMT (99kb)

Title: Ground-state properties of one-dimensional anyon gases
Authors: Yajiang Hao, Yunbo Zhang, Shu Chen
Categories: cond-mat.str-el cond-mat.stat-mech
Comments: 6 pages, 5 figures
\\
We investigate the ground state of the one-dimensional interacting anyonic
system based on the exact Bethe ansatz solution for arbitrary coupling constant
($0\leq c\leq \infty$) and statistics parameter ($0\leq \kappa \leq \pi$). It
is shown that the density of state in quasi-momentum $k$ space and the ground
state energy are determined by the renormalized coupling constant $c'$. The
effect induced by the statistics parameter $\kappa$ exhibits in the momentum
distribution in two aspects: Besides the effect of renormalized coupling, the
anyonic statistics results in the nonsymmetric momentum distribution when the
statistics parameter $\kappa$ deviates from 0 (Bose statistics) and $\pi$
(Fermi statistics) for any coupling constant $c$. The momentum distribution
evolves from a Bose distribution to a Fermi one as $\kappa$ varies from 0 to
$\pi$.
\\ ( http://arxiv.org/abs/0805.1988 , 99kb)
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arXiv:0805.2130
Date: Wed, 14 May 2008 18:22:26 GMT (17kb)

Title: The Trapped Polarized Fermi Gas at Unitarity
Authors: D. Blume
Categories: cond-mat.other
Comments: 4 pages, 2 tables, 2 figures
\\
We consider population-imbalanced two-component Fermi gases under external
harmonic confinement interacting through short-range two-body potentials with
diverging s-wave scattering length. Using the fixed-node diffusion Monte Carlo
method, the energies of the "normal state" are determined as functions of the
population-imbalance and the number of particles. The energies of the trapped
system follow, to a good approximation, a universal curve even for fairly small
systems. A simple parameterization of the universal curve is presented and
related to the equation of state of the bulk system.
\\ ( http://arxiv.org/abs/0805.2130 , 17kb)
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arXiv:0805.1927
Date: Wed, 14 May 2008 00:50:13 GMT (185kb)

Title: Optimal light storage with full pulse shape control
Authors: Irina Novikova, Nathaniel B. Phillips, and Alexey V. Gorshkov
Categories: quant-ph
Comments: 5 pages, 3 figures
\\
We experimentally demonstrate optimal storage and retrieval of light pulses
of arbitrary shape in atomic ensembles. By shaping auxiliary control pulses, we
attain efficiencies approaching the fundamental limit and achieve precise
retrieval into any predetermined temporal profile. Our techniques, demonstrated
in warm Rb vapor, are applicable to a wide range of systems and protocols. As
an example, we present their potential application to the creation of optical
time-bin qubits and to controlled partial retrieval.
\\ ( http://arxiv.org/abs/0805.1927 , 185kb)
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arXiv:0805.2040
Date: Wed, 14 May 2008 11:52:17 GMT (382kb)

Title: Quantum Accelerator Modes near Higher-Order Resonances
Authors: Italo Guarneri and Laura Rebuzzini
Categories: quant-ph
Comments: accepted for publication in Phys. Rev. Lett
\\
Quantum Accelerator Modes have been experimentally observed, and
theoretically explained, in the dynamics of kicked cold atoms in the presence
of gravity, when the kicking period is close to a half-integer multiple of the
Talbot time. We generalize the theory to the case when the kicking period is
sufficiently close to any rational multiple of the Talbot time, and thus
predict new rich families of experimentally observable Quantum Accelerator
Modes.
\\ ( http://arxiv.org/abs/0805.2040 , 382kb)
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arXiv:0805.2078
Date: Wed, 14 May 2008 14:45:26 GMT (11kb,D)

Title: Barrier transmission for the Nonlinear Schr\"odinger Equation:
Engineering nonlinear transport
Authors: K. Rapedius, H. J. Korsch
Categories: quant-ph
Comments: 6 pages, 2 figures
\\
In this communication we report on a peculiar property of barrier
transmission that systems governed by the nonlinear Schroedinger equation share
with the linear one: For unit transmission the potential can be divided at an
arbitrary point into two sub-potentials, a left and a right one, which have
exactly the same transmission. This is a rare case of an exact property of a
nonlinear wave function which will be of interest, e.g., for studies of
coherent transport of Bose-Einstein condensates through mesoscopic waveguide
\\ ( http://arxiv.org/abs/0805.2078 , 11kb)
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arXiv:0805.2120
Date: Wed, 14 May 2008 17:22:58 GMT (381kb)

Title: Quantum Billiards in Optical Lattices
Authors: Simone Montangero, Diego Frustaglia, Tommaso Calarco, Rosario Fazio
Categories: quant-ph
\\
We study finite two dimensional spin lattices with definite geometry (spin
billiards) demonstrating the display of collective integrable or chaotic
dynamics depending on their shape. We show that such systems can be quantum
simulated by ultra-cold atoms in optical lattices and discuss how to identify
their dynamical features in a realistic experimental setup. Possible
applications are the simulation of quantum information tasks in mesoscopic
devices.
\\ ( http://arxiv.org/abs/0805.2120 , 381kb)
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arXiv:0805.1784
Date: Tue, 13 May 2008 06:30:13 GMT (41kb)

Title: Pairing in spin polarized two-species fermionic mixtures with mass
asymmetry
Authors: S. A. Silotri, D. Angom, H. Mishra and Amruta Mishra
Categories: cond-mat.supr-con cond-mat.other physics.atom-ph
Comments: 8 pages and 6 figures
\\
We discuss on the pairing mechanism of fermions with mismatch in their fermi
momenta due to a mass asymmetry. Using a variational ansatz for the ground
state we also discuss the BCS -BEC crossover of this system. It is shown that
the breached pairing solution with a single fermi surface is stable in the BEC
regime. We also include the temperatures effect on the fermion pairing within
an approximation that is valid for temperatures much below the critical
temperature.
\\ ( http://arxiv.org/abs/0805.1784 , 41kb)
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arXiv:0805.2204
Date: Thu, 15 May 2008 04:03:40 GMT (620kb)

Title: Role of the Majorana Fermion and the Edge Mode in Chiral Superfluidity
near a p-Wave Feshbach Resonance
Authors: T. Mizushima, M. Ichioka, K. Machida
Categories: cond-mat.supr-con
Comments: 5 pages, 4 figures
\\
The Majorana zero energy mode of the vortex core and the edge mode are
investigated in chiral p-wave superfluid Fermi gases near p-wave Feshbach
resonance. We find that they survive until the strong coupling BCS regime is
approached from the weak coupling limit, but vanish in the BEC regime. We study
the roles of these modes in connection with (i) vortex visualization by the
density depletion inside the vortex core and (ii) intrinsic angular momentum in
vortex free states. Both (i) and (ii) are found to provide experimental methods
to detect evidence of the p-wave superfluidity.
\\ ( http://arxiv.org/abs/0805.2204 , 620kb)
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arXiv:0805.2210
Date: Thu, 15 May 2008 05:03:31 GMT (534kb)

Title: Dynamical Casimir effect for magnons in a spinor Bose-Einstein
condensate
Authors: Hiroki Saito and Hiroyuki Hyuga
Categories: cond-mat.other
Comments: 8 pages, 3 figures
\\
Magnon excitation in a spinor Bose-Einstein condensate by a driven magnetic
field is shown to have a close analogy with the dynamical Casimir effect. A
time-dependent external magnetic field amplifies quantum fluctuations in the
magnetic ground state of the condensate, leading to magnetization of the
system. The magnetization occurs in a direction perpendicular to the magnetic
field breaking the rotation symmetry. This phenomenon is numerically
demonstrated and the excited quantum field is shown to be squeezed.
\\ ( http://arxiv.org/abs/0805.2210 , 534kb)
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arXiv:0805.2180
Date: Wed, 14 May 2008 22:15:24 GMT (498kb)

Title: Quantum Metrology: Dynamics vs. Entanglement
Authors: Sergio Boixo, Animesh Datta, Matthew J. Davis, Steven T. Flammia, Anil
Shaji, Carlton M. Caves
Categories: quant-ph
Comments: 4 pages, 1 figure
\\
A parameter whose coupling to a quantum probe of $n$ constituents includes
all two-body interactions between the constituents can be measured with an
uncertainty that scales as $1/n^{3/2}$, even when the constituents are
initially unentangled. We devise a protocol that achieves the $1/n^{3/2}$
scaling without generating any entanglement among the constituents, and we
suggest that the protocol might be implemented in a two-component Bose-Einstein
condensate.
\\ ( http://arxiv.org/abs/0805.2180 , 498kb)
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The replacements:

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arXiv:quant-ph/0703044
replaced with revised version Fri, 9 May 2008 18:02:40 GMT (1897kb)

Title: Entanglement in Many-Body Systems
Authors: Luigi Amico, Rosario Fazio, Andreas Osterloh, and Vlatko Vedral
Categories: quant-ph cond-mat.stat-mech hep-th
Comments: 61 pages, 29 figures
Journal-ref: Rev. Mod. Phys. vol. 80, 517-576 (2008)
\\ ( http://arxiv.org/abs/quant-ph/0703044 , 1897kb)
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arXiv:0704.3047
replaced with revised version Mon, 12 May 2008 19:39:59 GMT (949kb)

Title: Observation of atom pairs in spontaneous four wave mixing of two
colliding Bose-Einstein Condensates
Authors: A. Perrin (LCFIO), H. Chang (LCFIO), V. Krachmalnicoff (LCFIO), M.
Schellekens (LCFIO), D. Boiron (LCFIO), A. Aspect (LCFIO), C. I. Westbrook
(LCFIO)
Categories: quant-ph cond-mat.other
Comments: A few typos have been corrected
Journal-ref: Physical Review Letters 99, 15 (2007) 150405
DOI: 10.1103/PhysRevLett.99.150405
\\ ( http://arxiv.org/abs/0704.3047 , 949kb)
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arXiv:0709.1763
replaced with revised version Mon, 12 May 2008 03:16:46 GMT (92kb)

Title: Magnetic Phase Transitions in One-dimensional Strongly Attractive
Three-Component Ultracold Fermions
Authors: X.W. Guan, M.T. Batchelor, C. Lee and H.-Q. Zhou
Categories: cond-mat.stat-mech cond-mat.str-el
Comments: 4 pages, 3 figures, minor revisions to text, replacement figure, refs
\\ ( http://arxiv.org/abs/0709.1763 , 92kb)
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arXiv:0711.4520
replaced with revised version Mon, 12 May 2008 11:57:05 GMT (133kb)

Title: Non-local density correlations as signal of Hawking radiation in BEC
acoustic black holes
Authors: Roberto Balbinot, Alessandro Fabbri, Serena Fagnocchi, Alessio Recati
and Iacopo Carusotto
Categories: cond-mat.other gr-qc hep-th
Comments: Strongly revised version. 5 pages, 3 eps figures
\\ ( http://arxiv.org/abs/0711.4520 , 133kb)
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arXiv:0712.4284
replaced with revised version Mon, 12 May 2008 17:55:30 GMT (494kb)

Title: The $p_{x,y}$-orbital counterpart of graphene: cold atoms in the
honeycomb optical lattice
Authors: Congjun Wu and S. Das Sarma
Categories: cond-mat.str-el cond-mat.mtrl-sci
\\ ( http://arxiv.org/abs/0712.4284 , 494kb)
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arXiv:0712.1805
replaced with revised version Sun, 11 May 2008 18:54:44 GMT (807kb)

Title: Quantum control of EIT dispersion via atomic tunneling in a double-well
Bose-Einstein condensate
Authors: James Owen Weatherall, Christopher P. Search, and Markku Jaaskelainen
Categories: quant-ph
\\ ( http://arxiv.org/abs/0712.1805 , 807kb)
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arXiv:0712.1990
replaced with revised version Sun, 11 May 2008 07:40:08 GMT (363kb)

Title: Atom Interferometry with up to 24-Photon-Momentum-Transfer Beam
Splitters
Authors: Holger Mueller, Sheng-wey Chiow, Quan Long, Sven Herrmann, and Steven
Chu
Categories: physics.atom-ph physics.optics
Comments: New introduction. 4 pages, 4 figures
Journal-ref: Phys. Rev. Lett. 100, 180405 (2008)
\\ ( http://arxiv.org/abs/0712.1990 , 363kb)
------------------------------------------------------------------------------
\\
arXiv:0801.4000
replaced with revised version Tue, 13 May 2008 10:36:06 GMT (145kb)

Title: Self-trapping of impurities in Bose-Einstein condensates: Strong
attractive and repulsive coupling
Authors: M. Bruderer, W. Bao and D. Jaksch
Categories: quant-ph
Comments: 7 pages, 5 figures
Journal-ref: Europhysics Letters 82, 30004 (2008)
DOI: 10.1209/0295-5075/82/30004
\\ ( http://arxiv.org/abs/0801.4000 , 145kb)
------------------------------------------------------------------------------
\\
arXiv:0712.2571
replaced with revised version Wed, 14 May 2008 11:35:18 GMT (559kb,D)

Title: Ultracold atomic gas in non-Abelian "magnetic" fields: the quantum Hall
effect supremacy
Authors: N. Goldman, A. Kubasiak, P. Gaspard and M. Lewenstein
Categories: cond-mat.mes-hall
Comments: 4 pages, 3 figures
\\ ( http://arxiv.org/abs/0712.2571 , 559kb)
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\\
arXiv:0805.1507
replaced with revised version Tue, 13 May 2008 22:25:37 GMT (324kb)

Title: Maximizing the Neel temperature of fermions in a simple-cubic optical
lattice
Authors: C.J.M. Mathy and David A. Huse
Categories: cond-mat.str-el
Comments: 4 pages, 3 figures, minor changes
\\ ( http://arxiv.org/abs/0805.1507 , 324kb)
------------------------------------------------------------------------------
\\
arXiv:0801.4000
replaced with revised version Wed, 14 May 2008 11:56:22 GMT (146kb)

Title: Self-trapping of impurities in Bose-Einstein condensates: Strong
attractive and repulsive coupling
Authors: M. Bruderer, W. Bao and D. Jaksch
Categories: quant-ph
Comments: 7 pages, 5 figures
Journal-ref: EuroPhys. Lett. 82, 30004 (2008)
DOI: 10.1209/0295-5075/82/30004
\\ ( http://arxiv.org/abs/0801.4000 , 146kb)
-----------------------------------------------------------------------------

Till next time,
Matt.

--
=========================================================================
Dr M. J. Davis,               Senior Lecturer in Physics
School of Physical Sciences,  email: mdavis_at_physics.uq.edu.au
University of Queensland,     ph   : +61 7 334 69824
Brisbane, QLD 4072,           fax  : +61 7 336 51242
Australia.                    http://www.physics.uq.edu.au/people/mdavis/
=========================================================================
Matt's arXiv selection: weekly summary of cold-atom papers from arXiv.org
http://www.physics.uq.edu.au/people/mdavis/matts_arXiv/
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Received on Tue Jun 03 2008 - 08:26:18 EST

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