From: Matthew Davis <mdavis_at_physics.uq.edu.au>

Date: Wed, 02 Apr 2008 08:04:28 +1000

Date: Wed, 02 Apr 2008 08:04:28 +1000

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

Apologies for the delay... it's right in the middle of the teaching semester. A

fortnight ago there were 34 new preprints and 15 replacements.

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arXiv:0803.1116

Date: Fri, 7 Mar 2008 15:34:52 GMT (99kb)

Title: Vacancy supersolid of hard-core bosons on the square lattice

Authors: Long Dang, Massimo Boninsegni and Lode Pollet

Categories: cond-mat.stat-mech

Comments: 4 pages, 8 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

The ground state of hard-core bosons on the square lattice with nearest and

next-nearest neighbor repulsion is studied by Quantum Monte Carlo simulations.

A supersolid phase with vacancy condensation and 'star' diagonal ordering is

found for filling less than a quarter. At fillings above one quarter, a

supersolid phase exists between the star and the stripe crystal at

half-filling, with continuous phase transitions between the various phases. No

supersolid phase occurs above quarter-filling, if the ground state at

half-filling is either a checkerboard crystal or a superfluid. No commensurate

supersolid phase is observed.

\\ ( http://arxiv.org/abs/0803.1116 , 99kb)

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arXiv:0803.1125

Date: Fri, 7 Mar 2008 16:04:15 GMT (61kb)

Title: Exact Relations for a Strongly-interacting Fermi Gas from the Operator

Product Expansion

Authors: Eric Braaten, Lucas Platter

Categories: cond-mat.other

Comments: 4 pages, 2 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

The momentum distribution in a Fermi gas with two spin states and a large

scattering length has a tail that falls off like 1/k^4 at large momentum k, as

pointed out by Shina Tan. He used novel methods to derive exact relations

between the coefficient of the tail in the momentum distribution and various

other properties of the system. We present simple derivations of these

relations using the operator product expansion for quantum fields. We identify

the coefficient as the integral over space of the expectation value of a local

operator that measures the density of pairs.

\\ ( http://arxiv.org/abs/0803.1125 , 61kb)

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arXiv:0803.1140

Date: Fri, 7 Mar 2008 17:38:12 GMT (286kb)

Title: Incompressible Liquid, Stripes and Bubbles in rapidly rotating Bose

atoms at $\nu=1$

Authors: Hidetsugu Seki and Kazusumi Ino

Categories: cond-mat.mes-hall

Comments: 11 pages, 22 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We numerically study the system of rapidly rotating Bose atoms at the filling

factor (ratio of particle number to vortex number) $\nu=1$ with the dipolar

interaction. A moderate dipolar interaction stabilizes the incompressible

quantum liquid at $\nu=1$. Further addition induces a collapse of it. The state

after the collapse is a compressible state which has phases with stripes and

bubbles.

There are two types of bubbles with a different array. We also investigate

models constructed from truncated interactions and the models with the

three-body contact interaction. They also have phases with stripes and bubbles.

\\ ( http://arxiv.org/abs/0803.1140 , 286kb)

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arXiv:0803.1167

Date: Fri, 7 Mar 2008 20:10:53 GMT (55kb)

Title: Photoassociation of a Bose-Einstein Condensate near a Feshbach Resonance

Authors: M. Junker, D. Dries, C. Welford, J. Hitchcock, Y. P. Chen and R. G.

Hulet

Categories: cond-mat.other

Comments: 5 pages, 4 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We measure the effect of a magnetically-tuned Feshbach resonance on the rate

and light-induced frequency shift of a photoassociation resonance in ultracold

$^7$Li. The photoassociation rate constant depends strongly on magnetic field,

varying by more than a factor of 10$^4$ for fields near the Feshbach resonance.

Intensity-dependent saturation and rollover in the rate constant are observed

in a thermal gas, while saturation is observed for the first time in a

Bose-Einstein condensate. The frequency shift is also strongly field-dependent

and exhibits an anomalous blue-shift for fields just below the Feshbach

resonance.

\\ ( http://arxiv.org/abs/0803.1167 , 55kb)

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arXiv:0803.1132

Date: Fri, 7 Mar 2008 20:53:30 GMT (372kb)

Title: Dynamics of Low-Density Ultracold Rydberg Gases

Authors: J. O. Day, E. Brekke, T. G. Walker

Categories: quant-ph

Comments: 9 pages, 7 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

Population dynamics in weakly-excited clouds of ultracold $^{87}$Rb Rydberg

atoms were studied by means of trap loss, fluorescence detection, and state

dependent stimulated emission. Rydberg atoms were excited to various nl Rydberg

states via continuous two-photon excitation from a magneto-optical trap. A

stimulated emission probe laser was then used to bring the Rydberg atoms down

to the 6P$_{3/2}$ state, allowing state-dependent detection of the Rydberg

atoms. Measurements of trap loss and fluorescent emission reveal information

about the evolution of the Rydberg populations. In particular, population in

the initial Rydberg state quickly transfers to other Rydberg states by a

non-collisional mechanism, likely superradiant emission. The trap-loss

measurements are consistent with black-body ionization as the dominant loss

mechanism.

\\ ( http://arxiv.org/abs/0803.1132 , 372kb)

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arXiv:0803.1039

Date: Fri, 7 Mar 2008 09:20:05 GMT (36kb)

Title: Frequency Light Shifts Caused by the Effects of Quantization of Atomic

Motion in an Optical Lattice

Authors: A. V. Taichenachev, V. I. Yudin, V. D. Ovsiannikov, V. G. Pal'chikov

Categories: physics.atom-ph physics.optics

Comments: 4 pages,1 figure, RevTex

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

Frequency light shifts resulting from the localization effects and effects of

the quantization of translational atomic motion in an optical lattice is

studied for a forbidden optical transition $J$=0$\to$$J$=0. In the Lamb-Dicke

regime this shift is proportional to the square root from the lattice field

intensity. With allowance made for magneto-dipole and quadrupole transitions,

the shift does not vanish at the magic wavelength, at which the linear in

intensity shift is absent. Preliminary estimates show that this shift can have

a principal significance for the lattice-based atomic clocks with accuracy of

order of 10$^{-16}-10^{-18}$. Apart from this, we find that the numerical value

of the magic frequency depends on the concrete configuration of the lattice

field and it can vary within the limits 1-100 MHz (depending on element) as one

passes from one field configuration to another. Thus, theoretical and

experimental investigations of contributions originated from magneto-dipole and

quadrupole transitions are of principal self-dependent interest.

\\ ( http://arxiv.org/abs/0803.1039 , 36kb)

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arXiv:0803.1215

Date: Sat, 8 Mar 2008 05:21:48 GMT (21kb)

Title: Fermionic ground state at unitarity and Haldane Exclusion Statistics

Authors: R.K. Bhaduri, M.V.N. Murthy and M. Brack

Categories: cond-mat.other

Comments: 4 pages, 3 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We consider a few-particle system of trapped neutral fermionic atoms at

ultra-low temperatures, with the attractive interaction tuned to Feshbach

resonance. We calculate the energies and the spatial densities of the few-body

systems using a generalisation of the extended Thomas-Fermi (ETF) method, and

assuming the particles obey the Haldane-Wu fractional exclusion statistics

(FES) at unitarity. This method is different from the scaled ETF version given

by Chang and Bertsch (Phys. Rev. A76,021603(R) (2007)). Our semiclassical FES

results are consistent with the Monte-Carlo calculations of the above authors,

but can hardly be distinguished from their over all scaling of the ETF result

at unitarity.

\\ ( http://arxiv.org/abs/0803.1215 , 21kb)

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arXiv:0803.1341

Date: Mon, 10 Mar 2008 04:00:31 GMT (39kb)

Title: Two ultracold atoms in a completely anisotropic trap

Authors: Jun-Jun Liang, Chao Zhang

Categories: cond-mat.supr-con

Comments: 4 pages, 2 figures

Journal-ref: Phys. Scr. 77 (2008) 025302

License: http://creativecommons.org/licenses/by-nc-sa/3.0/

\\

As a limiting case of ultracold atoms trapped in deep optical lattices, we

consider two interacting atoms trapped in a general anisotropic harmonic

oscillator potential, and obtain exact solutions of the Schrodinger equation

for this system. The energy spectra for different geometries of the trapping

potential are compared.

\\ ( http://arxiv.org/abs/0803.1341 , 39kb)

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arXiv:0803.1349

Date: Mon, 10 Mar 2008 06:48:37 GMT (28kb)

Title: Dynamical mean-field approximation for unitary Fermi gas

Authors: Nir Barnea

Categories: cond-mat.stat-mech

Comments: 4 pages, 3 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

Dynamical mean-field approximation with explicit pairing is utilized to study

the properties of a two-component Fermi gas at unitarity. The problem is

approximated by the lattice Hubbard Hamiltonian, and the continuum limit is

realized by diluting the lattice. We have found that at zero temperature the

predictions of this theory for the energy and the pairing gap agree remarkably

well with the results of full numerical Monte-Carlo simulations. Investigating

the evolution of the system with temperature we identify the existence of a

second order phase transition associated with a jump in the heat capacity and

the collapse of the pairing gap.

\\ ( http://arxiv.org/abs/0803.1349 , 28kb)

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arXiv:0803.1405

Date: Mon, 10 Mar 2008 13:28:40 GMT (311kb,D)

Title: Collisional Properties of p-Wave Feshbach Molecules

Authors: Yasuhisa Inada, Munekazu Horikoshi, Shuta Nakajima, Makoto

Kuwata-Gonokami, Masahito Ueda, Takashi Mukaiyama

Categories: cond-mat.other

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We detected the formation of p-wave Feshbach molecules for all three

combinations of the two lowest atomic spin states of 6Li. By creating a pure

molecular sample in an optical trap, we measured the inelastic collision rates

of p-wave molecules. The elastic collision rate was measured from the

thermalization rate of a breathing mode excited spontaneously upon molecular

formation.

\\ ( http://arxiv.org/abs/0803.1405 , 311kb)

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arXiv:0803.1430

Date: Mon, 10 Mar 2008 14:43:10 GMT (53kb)

Title: A dynamical theory of thermalization of composite quantum systems

Authors: Sumiyoshi Abe, A. R. Usha Devi, A. K. Rajagopal

Categories: cond-mat.stat-mech

Comments: 14 pages, no figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

A quantum theoretical approach to the foundations of thermalization is

presented. This is a dynamical generalization of the kinematical approach

examined in a recent work [S. Popescu, A. J. Short, and A. Winter, Nature

Physics 2, 754 (2006)]. It is shown that a sequential application of the

dynamical interaction of the objective system with its environment, represented

by unital positive operator-valued measures, makes the system evolve to the

chaotic state. The space of the objective system is considered, in which the

system is constrained to have a given value of the fidelity. Then, the maximum

entropy principle yields a thermal state described by the canonical density

matrix. This scheme is illustrated by examples of bipartite systems. Thus, a

confluence of three principles, viz. the maximum entropy principle, unital

dynamical maps, and system-environment entanglement, play a unified role in

establishing thermalization.

\\ ( http://arxiv.org/abs/0803.1430 , 53kb)

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arXiv:0803.1229

Date: Sat, 8 Mar 2008 09:17:03 GMT (49kb)

Title: Atomic current in optical lattices: Esaki-Tsu equation revisited

Authors: Andrey R. Kolovsky

Categories: quant-ph

Comments: 4 pages

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

The paper discusses the master equation approach to derivation of the

Esaki-Tsu equation for drift current. It is shown that the relaxation term in

the master equation can be identified by measuring the velocity distribution of

the carriers. We also show that the standard form of the relaxation term, used

earlier to derive Esaki-Tsu equation, predicts unphysical velocity distribution

and suggest a more elaborated relaxation term, which is argued to correctly

capture the effect of bosonic bath in experiments on atomic current in optical

lattices.

\\ ( http://arxiv.org/abs/0803.1229 , 49kb)

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arXiv:0803.1406

Date: Mon, 10 Mar 2008 13:15:38 GMT (223kb,D)

Title: Single Particle Tunneling in Strongly Driven Double Well Potentials

Authors: E. Kierig and U. Schnorrberger, A. Schietinger, J. Tomkovic, and M.K.

Oberthaler

Categories: quant-ph

Comments: 4 pages, 5 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We report on the first direct observation of coherent control of single

particle tunneling in a strongly driven double well potential. In our setup

atoms propagate in a periodic arrangement of double wells allowing the full

control of the driving parameters such as frequency, amplitude and even the

space-time symmetry. Our experimental findings are in quantitative agreement

with the predictions of the corresponding Floquet theory and are also compared

to the predictions of a simple two mode model. Our experiments reveal directly

the critical dependence of coherent destruction of tunneling on the generalized

parity symmetry.

\\ ( http://arxiv.org/abs/0803.1406 , 223kb)

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arXiv:0803.1482

Date: Mon, 10 Mar 2008 19:56:27 GMT (429kb)

Title: Quantum States and Phases in Driven Open Quantum Systems with Cold Atoms

Authors: S. Diehl (1,2), A. Micheli (1,2), A. Kantian (1,2), B. Kraus (1,2),

H.P. B\"uchler (3), and P. Zoller (1,2) ((1) Institute for Theoretical

Physics, University of Innsbruck, Austria, (2) Institute for Quantum Optics

and Quantum Information of the Austrian Academy of Sciences, Austria, (3)

Institute for Theoretical Physics III, University of Stuttgart, Germany)

Categories: quant-ph

Comments: 9 pages, 2 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

An open quantum system, whose time evolution is governed by a master

equation, can be driven into a given pure quantum state by an appropriate

design of the system-reservoir coupling. This points out a route towards

preparing many body states and non-equilibrium quantum phases by quantum

reservoir engineering. Here we discuss in detail the example of a \emph{driven

dissipative Bose Einstein Condensate} of bosons and of paired fermions, where

atoms in an optical lattice are coupled to a bath of Bogoliubov excitations via

the atomic current representing \emph{local dissipation}. In the absence of

interactions the lattice gas is driven into a pure state with long range order.

Weak interactions lead to a weakly mixed state, which in 3D can be understood

as a depletion of the condensate, and in 1D and 2D exhibits properties

reminiscent of a Luttinger liquid or a Kosterlitz-Thouless critical phase at

finite temperature, with the role of the ``finite temperature'' played by the

interactions.

\\ ( http://arxiv.org/abs/0803.1482 , 429kb)

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arXiv:0710.1575 (*cross-listing*)

Date: Mon, 8 Oct 2007 15:30:12 GMT (654kb)

Date (revised v2): Mon, 3 Mar 2008 09:25:53 GMT (847kb)

Title: Probing quantum and thermal noise in an interacting many-body system

Authors: S. Hofferberth, I. Lesanovsky, T. Schumm, A. Imambekov, V. Gritsev, E.

Demler, J. Schmiedmayer

Categories: cond-mat.other quant-ph

\\

The probabilistic character of the measurement process is one of the most

puzzling and fascinating aspects of quantum mechanics. In many-body systems

quantum mechanical noise reveals non-local correlations of the underlying

many-body states. Here, we provide a complete experimental analysis of the

shot-to-shot variations of interference fringe contrast for pairs of

independently created one-dimensional Bose condensates. Analyzing different

system sizes we observe the crossover from thermal to quantum noise, reflected

in a characteristic change in the distribution functions from Poissonian to

Gumbel-type, in excellent agreement with theoretical predictions based on the

Luttinger liquid formalism. We present the first experimental observation of

quasi long-range order in one-dimensional atomic condensates, which is a

hallmark of quantum fluctuations in one-dimensional systems. Furthermore, our

experiments constitute the first analysis of the full distribution of quantum

noise in an interacting many-body system.

\\ ( http://arxiv.org/abs/0710.1575 , 847kb)

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arXiv:0802.0386 (*cross-listing*)

Date: Mon, 4 Feb 2008 11:32:54 GMT (280kb)

Title: Long-Range Order in Electronic Transport through Disordered Metal Films

Authors: S. Aigner, L. Della Pietra, Y. Japha, O. Entin-Wohlman, T. David, R.

Salem, R. Folman, J. Schmiedmayer

Categories: cond-mat.mtrl-sci cond-mat.other quant-ph

Journal-ref: Science 319, 1226 - 1229, (2008)

DOI: 10.1126/science.1152458

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

Ultracold atom magnetic field microscopy enables the probing of current flow

patterns in planar structures with unprecedented sensitivity. In

polycrystalline metal (gold) films we observe long-range correlations forming

organized patterns oriented at +/- 45 deg relative to the mean current flow,

even at room temperature and at length scales orders of magnitude larger than

the diffusion length or the grain size. The preference to form patterns at

these angles is a direct consequence of universal scattering properties at

defects. The observed amplitude of the current direction fluctuations scales

inversely to that expected from the relative thickness variations, the grain

size and the defect concentration, all determined independently by standard

methods. This indicates that ultracold atom magnetometry enables new insight

into the interplay between disorder and transport.

\\ ( http://arxiv.org/abs/0802.0386 , 280kb)

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arXiv:0803.1498

Date: Mon, 10 Mar 2008 20:41:38 GMT (18kb)

Title: Evolution from BCS to BKT superfluidity in one-dimensional optical

lattices

Authors: M. Iskin and C. A. R. S \'a de Melo

Categories: cond-mat.supr-con cond-mat.other

Comments: 4 pages with 2 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We analyze the finite temperature phase diagram of fermion mixtures in

one-dimensional optical lattices as a function of interaction strength. At low

temperatures, the system evolves from an anisotropic three-dimensional

Bardeen-Cooper-Schrieffer (BCS) superfluid to an effectively two-dimensional

Berezinskii-Kosterlitz-Thouless (BKT) superfluid as the interaction strength

increases. We calculate the critical temperature as a function of interaction

strength, and identify the region where the dimensional crossover occurs for a

specified optical lattice potential. Finally, we show that the dominant vortex

excitations near the critical temperature evolve from multiplane elliptical

vortex loops in the three-dimensional regime to planar vortex-antivortex pairs

in the two-dimensional regime, and we propose a detection scheme for these

excitations.

\\ ( http://arxiv.org/abs/0803.1498 , 18kb)

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arXiv:0803.1503

Date: Mon, 10 Mar 2008 21:57:31 GMT (59kb)

Title: Variational HFB Equations in the Thomas-Fermi Limit for Ultracold

Trapped Gases

Authors: M. Benarous

Categories: cond-mat.stat-mech

Comments: 16 pages, 6 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We derive variationally the HFB equations for a trapped self-interacting Bose

gas at finite temperature. In the Thomas-Fermi limit, we obtain simple

expressions for the condensate, the non condensate and the anomalous densities.

Their behavior in terms of the condensate fraction meets qualitatively the

experimental data. In particular, the non condensate and the anomalous

densities are peaked at the center of the trap and not at the edges as

predicted by the self-consistent HFB calculations.

\\ ( http://arxiv.org/abs/0803.1503 , 59kb)

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arXiv:0803.1548

Date: Tue, 11 Mar 2008 10:13:45 GMT (519kb)

Title: Adiabatic Loading of Cold Bosons in Three-Dimensional Optical Lattices

and Superfluid-Normal Phase Transition

Authors: S. Yoshimura, S. Konabe, and T. Nikuni

Categories: cond-mat.other

Comments: 4 pages, 8 figures

License: http://creativecommons.org/licenses/by/3.0/

\\

We investigate the effects of the adiabatic loading of optical lattices to

the temperature by applying the mean-field approximation to the

three-dimensional Bose-Hubbard model at finite temperatures. We compute the

lattice-height dependence of the isentropic curves for the given initial

temperatures in case of the homogeneous system i.e., neglecting the trapping

potential. Taking the unit of temperatures as the recoil energy, the adiabatic

cooling/heating through superfluid (SF) - normal (N) phase transition is

clearly understood. It is found that the cooling occurs in SF phase while the

heating occurs in N phase and the efficiency of adibatic cooling/heating is

higher at higher temperatures. We also explain how its behavior can be

understood from the lattice-hight dependence of dispersion relation in each

phase. Furthermore, the connection of the adiabatic heating/cooling between the

cases with/without the trapping potential is discussed.

\\ ( http://arxiv.org/abs/0803.1548 , 519kb)

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arXiv:0803.1647

Date: Tue, 11 Mar 2008 18:29:27 GMT (7kb)

Title: Virial theorem for confined universal Fermi gases

Authors: J. E. Thomas

Categories: cond-mat.stat-mech cond-mat.other

Comments: 3 pages

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

Optically-trapped two-component Fermi gases near a broad Feshbach resonance

exhibit universal thermodynamics, where the properties of the gas are

independent of the details of the two-body scattering interactions. We present

a global proof that such a universal gas obeys the virial theorem for {\it any}

trapping potential $U$ and any spin mixture, without assuming either the local

density approximation or harmonic confinement. The total energy of the gas is

given in scale invariant form by $E=<\epsilon\partial U/\partial\epsilon>$,

where $\epsilon$ is an {\it arbitrary} energy scale in terms of which all

length and energy scales that appear in the confining potential are written.

This result enables model-independent energy measurement in traps that are

anharmonic as well as anisotropic by observing only the cloud profile, and

provides a consistency check for many-body calculations in the universal

regime.

\\ ( http://arxiv.org/abs/0803.1647 , 7kb)

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arXiv:0803.1280 (*cross-listing*)

Date: Sun, 9 Mar 2008 15:10:28 GMT (723kb)

Title: The ground state energy at unitarity

Authors: Dean Lee (North Carolina State University)

Categories: nucl-th cond-mat.other hep-lat

Comments: 27 pages, 9 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We consider two-component fermions on the lattice in the unitarity limit.

This is an idealized limit of attractive fermions where the range of the

interaction is zero and the scattering length is infinite. Using Euclidean time

projection, we compute the ground state energy using four computationally

different but physically identical auxiliary-field methods. The best

performance is obtained using a bounded continuous auxiliary field and a

non-local updating algorithm called hybrid Monte Carlo. With this method we

calculate results for 10 and 14 fermions at lattice volumes 4^3, 5^3, 6^3, 7^3,

8^3 and extrapolate to the continuum limit. For 10 fermions in a periodic cube,

the ground state energy is 0.292(12) times the ground state energy for

non-interacting fermions. For 14 fermions the ratio is 0.329(5).

\\ ( http://arxiv.org/abs/0803.1280 , 723kb)

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arXiv:0803.1478 (*cross-listing*)

Date: Mon, 10 Mar 2008 19:21:51 GMT (19kb)

Title: Measurement-based quantum computer in the gapped ground state of a

two-body Hamiltonian

Authors: Gavin K. Brennen, Akimasa Miyake

Categories: quant-ph cond-mat.other

Comments: 5 pages, 1 figure

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We propose a scheme of the ground-code measurement-based quantum computer,

which enjoys two major advantages. (i) Every logical qubit is encoded in the

gapped degenerate ground subspace of a spin-1 chain with nearest-neighbor

two-body interactions, so that it equips built-in robustness against noise.

(ii) Computation is processed by single-spin measurements along multiple chains

dynamically coupled on demand, so as to keep teleporting only logical

information into a gap-protected ground state of the rest chains after the

interactions with spins to be measured are adiabatically turned off. We

describe implementations using trapped atoms or polar molecules in an optical

lattice, where the gap is expected to be as large as 0.2 KHz or 4.8 KHz

respectively.

\\ ( http://arxiv.org/abs/0803.1478 , 19kb)

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arXiv:0803.1499

Date: Mon, 10 Mar 2008 21:11:52 GMT (42kb)

Title: Multipartite Entanglement in Non-Equilibrium Quantum Phase Transition in

a Collective Atomic System

Authors: Kishore T. Kapale and Girish S. Agarwal

Categories: quant-ph

Comments: 4 pages, 7 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We study multipartite entanglement in non-equilibrium quantum phase

transition (NEQPT) attainable in a coherently driven atomic ensemble undergoing

collective decay. The NEQPT arises in the steady state of the system as the

drive field strength is varied in comparison with the decay parameter. A close

connection is observed between the critical behavior and the multi-partite

entanglement in the system determined via the von Neumann entropy. The

derivative of the von Neumann entropy shows Lambda-type behavior typical of the

second order phase transitions. We further show that the calculated bi- and

tri- partite entropies satisfy the Lieb inequality.

\\ ( http://arxiv.org/abs/0803.1499 , 42kb)

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arXiv:0803.1643

Date: Tue, 11 Mar 2008 18:38:16 GMT (815kb,D)

Title: Quantum Many-Body Dynamics of Coupled Double-Well Superlattices

Authors: Peter Barmettler, Ana Maria Rey, Eugene Demler, Mikhail D. Lukin,

Immanuel Bloch, Vladimir Gritsev

Categories: quant-ph

Comments: 13 pages, 10 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We propose a method for controllable generation of non-local entangled pairs

using spinor atoms loaded in an optical superlattice. Our scheme iteratively

increases the distance between entangled atoms by controlling the coupling

between the double wells. When implemented in a finite linear chain of 2N

atoms, it creates a triplet valence bond state with large persistency of

entanglement (of the order of N). We also study the non-equilibrium dynamics of

the one-dimensional ferromagnetic Heisenberg Hamiltonian and show that the time

evolution of a state of decoupled triplets on each double well leads to the

formation of a highly entangled state where short-distance antiferromagnetic

correlations coexist with longer-distance ferromagnetic ones. We present

methods for detection and characterization of the various dynamically generated

states. These ideas are a step forward towards the use of atoms trapped by

light as quantum information processors and quantum simulators.

\\ ( http://arxiv.org/abs/0803.1643 , 815kb)

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arXiv:0803.1774

Date: Wed, 12 Mar 2008 14:00:12 GMT (272kb)

Title: Disorder-induced trapping versus Anderson localization in Bose-Einstein

condensates expanding in disordered potentials

Authors: Laurent Sanchez-Palencia (LCFIO), David Cl\'ement (LCFIO), Pierre

Lugan (LCFIO), Philippe Bouyer (LCFIO), Alain Aspect (LCFIO)

Categories: cond-mat.other

Comments: To appear in the New Journal of Physics; focus issue "Quantum

Correlations in Tailored Matter - Common perspectives of mesoscopic systems

and quantum gases"; 30 pages, 10 figures

Proxy: ccsd hal-00263549

\\

We theoretically investigate the localization of an expanding Bose-Einstein

condensate with repulsive atom-atom interactions in a disordered potential. We

focus on the regime where the initial inter-atomic interactions dominate over

the kinetic energy and the disorder. At equilibrium in a trapping potential and

for small disorder, the condensate shows a Thomas-Fermi shape modified by the

disorder. When the condensate is released from the trap, a strong suppression

of the expansion is obtained in contrast to the situation in a periodic

potential with similar characteristics. This effect crucially depends on both

the momentum distribution of the expanding BEC and the strength of the

disorder. For strong disorder, the suppression of the expansion results from

the fragmentation of the core of the condensate and from classical reflections

from large modulations of the disordered potential in the tails of the

condensate. We identify the corresponding disorder-induced trapping scenario

for which large atom-atom interactions and strong reflections from single

modulations of the disordered potential play central roles. For weak disorder,

the suppression of the expansion signals the onset of Anderson localization,

which is due to multiple scattering from the modulations of the disordered

potential. We compute analytically the localized density profile of the

condensate and show that the localization crucially depends on the correlation

function of the disorder. In particular, for speckle potentials the long-range

correlations induce an effective mobility edge in 1D finite systems. Numerical

calculations performed in the mean-field approximation support our analysis for

both strong and weak disorder.

\\ ( http://arxiv.org/abs/0803.1774 , 272kb)

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\\

arXiv:0803.1482 (*cross-listing*)

Date: Mon, 10 Mar 2008 19:56:27 GMT (429kb)

Title: Quantum States and Phases in Driven Open Quantum Systems with Cold Atoms

Authors: S. Diehl (1,2), A. Micheli (1,2), A. Kantian (1,2), B. Kraus (1,2),

H.P. B\"uchler (3), and P. Zoller (1,2) ((1) Institute for Theoretical

Physics, University of Innsbruck, Austria, (2) Institute for Quantum Optics

and Quantum Information of the Austrian Academy of Sciences, Austria, (3)

Institute for Theoretical Physics III, University of Stuttgart, Germany)

Categories: quant-ph cond-mat.stat-mech cond-mat.str-el

Comments: 9 pages, 2 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

An open quantum system, whose time evolution is governed by a master

equation, can be driven into a given pure quantum state by an appropriate

design of the system-reservoir coupling. This points out a route towards

preparing many body states and non-equilibrium quantum phases by quantum

reservoir engineering. Here we discuss in detail the example of a \emph{driven

dissipative Bose Einstein Condensate} of bosons and of paired fermions, where

atoms in an optical lattice are coupled to a bath of Bogoliubov excitations via

the atomic current representing \emph{local dissipation}. In the absence of

interactions the lattice gas is driven into a pure state with long range order.

Weak interactions lead to a weakly mixed state, which in 3D can be understood

as a depletion of the condensate, and in 1D and 2D exhibits properties

reminiscent of a Luttinger liquid or a Kosterlitz-Thouless critical phase at

finite temperature, with the role of the ``finite temperature'' played by the

interactions.

\\ ( http://arxiv.org/abs/0803.1482 , 429kb)

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\\

arXiv:0803.1665

Date: Tue, 11 Mar 2008 20:06:39 GMT (318kb)

Title: Many body effects and cluster state quantum computation in strongly

interacting systems of photons

Authors: Dimitris G. Angelakis, Sougato Bose, Alastair Kay, Marcelo F. Santos

Categories: quant-ph

Comments: 10 pages. Contribution to proceedings of "Quantum Information and

Many-Body Quantum Systems" Workshop, 26-31 Mar 2007, Pisa

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We discuss the basic properties of a recently proposed hybrid light-matter

system of strongly interacting photons in an array of coupled cavities each

doped with a single two level system. Using the non-linearity generated from

the photon blockade effect, we predict strong correlations between the hopping

photons in the array, and show the possibility of observing a phase transition

from a polaritonic insulator to a superfluid of photons. In the Mott phase,

this interaction can be mapped to an array of spins. We show how the remaining

Hamiltonian, in conjunction with individual spin manipulation, can thus be used

for simulating spin chains (useful for state transfer protocols) and cluster

state quantum computation.

\\ ( http://arxiv.org/abs/0803.1665 , 318kb)

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\\

arXiv:0803.1760

Date: Wed, 12 Mar 2008 12:36:15 GMT (23kb)

Title: Entanglement of two distant Bose-Einstein condensates by detection of

Bragg-scattered photons

Authors: B. Deb and G. S. Agarwal

Categories: quant-ph

Comments: 8 pages, 7 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We show that it is possible to entangle two distant Bose-Einstein condensates

by detection of Hanbury Brown-Twiss type correlations in photons

Bragg-scattered by the condensates. The generated entanglement is either in

quasiparticle number or quadrature phase variables. We present selective

results which exhibit complementary squeezing behavior in relative

quasi-particle number and phase operators. Our proposed scheme can be

generalized for multiple condensates and also for spinor condensates with Bragg

scattering of polarized light with the latter capable of producing hyper

entanglement.

\\ ( http://arxiv.org/abs/0803.1760 , 23kb)

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\\

arXiv:0803.1799

Date: Wed, 12 Mar 2008 16:51:14 GMT (82kb)

Title: Dynamics and stability of Bose-Einstein condensates with attractive 1/r

interaction

Authors: Holger Cartarius, Toma\v{z} Fab\v{c}i\v{c}, J\"org Main, G\"unter

Wunner

Categories: quant-ph

Comments: 12 pages, 12 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

The time-dependent extended Gross-Pitaevskii equation for Bose-Einstein

condensates with attractive 1/r interaction is investigated with both a

variational approach and numerically exact calculations. We show that these

condensates exhibit signatures known from the nonlinear dynamics of autonomous

Hamiltonian systems. The two stationary solutions created in a tangent

bifurcation at a critical value of the scattering length are identified as

elliptical and hyperbolical fixed points, corresponding to stable and unstable

stationary states of the condensate. The stable stationary state is surrounded

by elliptical islands, corresponding to condensates periodically oscillating in

time, whereas condensate wave functions in the unstable region undergo a

collapse within finite time. For negative scattering lengths below the tangent

bifurcation no stationary solutions exist, i.e., the condensate is always

unstable and collapses.

\\ ( http://arxiv.org/abs/0803.1799 , 82kb)

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\\

arXiv:0803.1810

Date: Wed, 12 Mar 2008 16:40:44 GMT (146kb)

Title: Entanglement Swapping with Storage and Retrieval of Light: A Building

Block of Quantum Repeaters

Authors: Zhen-Sheng Yuan, Yu-Ao Chen, Bo Zhao, Shuai Chen, Joerg Schmiedmayer,

Jian-Wei Pan

Categories: quant-ph

Comments: 18 pages, 4 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

Here we report on the realization of a key element of a quantum repeater:

Entanglement connection between two remote stored atomic qubits mediated by two

photon interference and the transfer of the stored entanglement back to photon

for further transmission. In the experiment, two atomic ensembles, each

entangled with a single photon they emit, are projected into an entangled state

by performing a joint Bell state measurement on the two single photons after

passing through a 300 m long fiber-based communication channel. The

entanglement is stored and later mapped back onto two photons whose

entanglement is verified by the violation of Bell's inequality or by an

entanglement witness. Our method is intrinsically phase insensitive and

establishes the essential element to realize quantum repeaters with stationary

atomic qubits as quantum memories and flying photonic qubits as quantum

messengers.

\\ ( http://arxiv.org/abs/0803.1810 , 146kb)

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\\

arXiv:0803.1889

Date: Thu, 13 Mar 2008 03:48:41 GMT (120kb)

Title: Atom-Pair Tunneling in Optical Lattices Beyond the Bose-Hubbard Model

Authors: J.-Q. Liang, J.-L. Liu, W.-D. Li, Z.-J. Li

Categories: cond-mat.other

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We demonstrate that the Bose-Hubbard model of ultracold spinless atoms in

strongly interacting regime should be extended to include the two-body

interaction of nearest neighbors.. An atom-pair tunneling term appeared

naturally in the extended model, which leads to essentially no effect in the

weak interaction limit, plays a crucial role in the strong atom-atom

interaction regime. The tunneling dynamics of two-atom occupation in a

double-well trap is studied in terms of both the Bose-Hubbard and extended

Hamiltonians showing significant difference and the later results in a good

agreement with the experimental observation of atom-pair tunneling.

\\ ( http://arxiv.org/abs/0803.1889 , 120kb)

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\\

arXiv:0803.2015

Date: Thu, 13 Mar 2008 17:37:48 GMT (684kb)

Title: Noise correlation spectroscopy of the broken order of a Mott insulating

phase

Authors: V. Guarrera, N. Fabbri, L. Fallani, C. Fort, K. M. R. van der Stam,

and M. Inguscio

Categories: cond-mat.other

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We use a two-color lattice to break the homogeneous site occupation of an

atomic Mott Insulator of bosonic 87Rb. We detect the disruption of the ordered

Mott domains via noise correlation analysis of the atomic density distribution

after time-of-flight. The appearance of additional correlation peaks evidences

the redistribution of the atoms into a strongly inhomogeneous insulating state,

in quantitative agreement with the predictions.

\\ ( http://arxiv.org/abs/0803.2015 , 684kb)

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\\

arXiv:0803.1501 (*cross-listing*)

Date: Mon, 10 Mar 2008 21:38:20 GMT (230kb)

Title: Self-consistent crystalline condensate in chiral Gross-Neveu and

Bogoliubov-de Gennes systems

Authors: Gokce Basar and Gerald V. Dunne

Categories: hep-th cond-mat.supr-con hep-lat hep-ph quant-ph

Comments: 5 pages, 5 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We derive a new exact self-consistent crystalline condensate in the 1+1

dimensional chiral Gross-Neveu model. This also yields a new exact crystalline

solution for the one dimensional Bogoliubov-de Gennes equations and the

Eilenberger equation of semiclassical superconductivity. We show that the

functional gap equation can be reduced to a solvable nonlinear equation, and

discuss implications for the temperature-chemical potential phase diagram.

\\ ( http://arxiv.org/abs/0803.1501 , 230kb)

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\\

arXiv:0803.1887

Date: Thu, 13 Mar 2008 03:45:17 GMT (54kb)

Title: Hybrid phase-space simulation method for interacting Bose fields

Authors: Scott E. Hoffmann, Joel F. Corney and Peter D. Drummond

Categories: quant-ph

Comments: 13 pages; 6 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We introduce an approximate phase-space technique to simulate the quantum

dynamics of interacting bosons. With the future goal of treating Bose-Einstein

condensate systems, the method is designed for systems with a natural

separation into highly occupied (condensed) modes and lightly occupied modes.

The method self-consistently uses the Wigner representation to treat highly

occupied modes and the positive-P representation for lightly occupied modes. In

this method, truncation of higher-derivative terms from the Fokker-Planck

equation is usually necessary. However, at least in the cases investigated

here, the resulting systematic error, over a finite time, vanishes in the limit

of large Wigner occupation numbers. We tested the method on a system of two

interacting anharmonic oscillators, with high and low occupations,

respectively. The Hybrid method successfully predicted atomic quadratures to a

useful simulation time 60 times longer than that of the positive-P method. The

truncated Wigner method also performed well in this test. For the prediction of

the correlation in a quantum nondemolition measurement scheme, for this same

system, the Hybrid method gave excellent agreement with the exact result, while

the truncated Wigner method showed a large systematic error.

\\ ( http://arxiv.org/abs/0803.1887 , 54kb)

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The replacements:

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\\

arXiv:0803.0059

Date: Sat, 1 Mar 2008 11:13:43 GMT (454kb)

Date (revised v2): Tue, 4 Mar 2008 09:14:59 GMT (469kb)

Title: Probing Mott lobes via the AC Josephson effect

Authors: M.X. Huo, Ying Li, Z. Song and C.P. Sun

Categories: quant-ph cond-mat.str-el

Comments: 5 pages, 4 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

The alternating-current (AC) Josephson effect is studied in a system

consisting of two weakly coupled Bose Hubbard models. In the framework of the

mean field theory, Gross-Pitaevskii equations show that the amplitude of the

Josephson current is proportional to the product of superfluid order

parameters. In addition, the chemical potential--current relation for a small

size system is obtained via the exact numerical computation. This allows us to

propose a feasible experimental scheme to measure the Mott lobes of the quantum

phase transition.

\\ ( http://arxiv.org/abs/0803.0059 , 469kb)

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\\

arXiv:0704.3906

replaced with revised version Mon, 10 Mar 2008 18:24:31 GMT (64kb)

Title: Area laws in quantum systems: mutual information and correlations

Authors: M.M. Wolf, F. Verstraete, M.B. Hastings, J.I. Cirac

Categories: quant-ph cond-mat.stat-mech

Comments: 5 pages, 2 figures, published version with appendix

Journal-ref: Phys. Rev. Lett. 100, 070502 (2008)

\\ ( http://arxiv.org/abs/0704.3906 , 64kb)

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\\

arXiv:0706.3879

replaced with revised version Mon, 10 Mar 2008 03:22:38 GMT (130kb)

Title: Coherent Quantum Optical Control with Subwavelength Resolution

Authors: Alexey V. Gorshkov, Liang Jiang, Markus Greiner, Peter Zoller, and

Mikhail D. Lukin

Categories: quant-ph cond-mat.mes-hall cond-mat.other

Comments: 4 pages, 2 figures. V2: changes in presentation (text, figures,

tables) and new references - final version as published in Phys. Rev. Lett.

Journal-ref: Phys. Rev. Lett. 100, 093005 (2008)

DOI: 10.1103/PhysRevLett.100.093005

\\ ( http://arxiv.org/abs/0706.3879 , 130kb)

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\\

arXiv:0708.3241

replaced with revised version Mon, 10 Mar 2008 19:43:56 GMT (148kb)

Title: Supersolid Bose-Fermi Mixtures in Optical Lattices

Authors: I. Titvinidze, M. Snoek, W. Hofstetter

Categories: cond-mat.other

Comments: 4 pages, 5 pictures, Published version

Journal-ref: Phys. Rev. lett. 100, 100401 (2008)

DOI: 10.1103/PhysRevLett.100.100401

\\ ( http://arxiv.org/abs/0708.3241 , 148kb)

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\\

arXiv:0711.3015

replaced with revised version Sun, 9 Mar 2008 10:22:21 GMT (534kb,D)

Title: Quantum magnetism and criticality

Authors: Subir Sachdev

Categories: cond-mat.str-el cond-mat.supr-con hep-th quant-ph

Comments: 39 pages, 10 figures, review article for non-specialists; (v2) added

clarifications and references; (v3) minor corrections; (v4) added footnote on

hydrodynamic long-time tails

Journal-ref: Nature Physics 4, 173 (2008)

DOI: 10.1038/nphys894

\\ ( http://arxiv.org/abs/0711.3015 , 534kb)

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\\

arXiv:0802.3158

replaced with revised version Mon, 10 Mar 2008 17:48:40 GMT (59kb)

Title: Probing ultra-cold Fermi atoms with a single ion

Authors: Y. Sherkunov, B. Muzykantskii, N. d'Ambrumenil, B.D Simons

Categories: cond-mat.str-el

Comments: 4 pages, 2 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\ ( http://arxiv.org/abs/0802.3158 , 59kb)

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\\

arXiv:0803.0846

replaced with revised version Mon, 10 Mar 2008 10:47:03 GMT (520kb)

Title: Ground State Properties of a Tonks-Girardeau Gas in a Split Trap

Authors: J. Goold and Th. Busch

Categories: cond-mat.other quant-ph

Comments: 7 pages, 9 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\ ( http://arxiv.org/abs/0803.0846 , 520kb)

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\\

arXiv:0706.3879

replaced with revised version Mon, 10 Mar 2008 03:22:38 GMT (130kb)

Title: Coherent Quantum Optical Control with Subwavelength Resolution

Authors: Alexey V. Gorshkov, Liang Jiang, Markus Greiner, Peter Zoller, and

Mikhail D. Lukin

Categories: quant-ph cond-mat.mes-hall cond-mat.other

Comments: 4 pages, 2 figures. V2: changes in presentation (text, figures,

tables) and new references - final version as published in Phys. Rev. Lett.

Journal-ref: Phys. Rev. Lett. 100, 093005 (2008)

DOI: 10.1103/PhysRevLett.100.093005

\\ ( http://arxiv.org/abs/0706.3879 , 130kb)

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\\

arXiv:0706.0839

replaced with revised version Tue, 11 Mar 2008 12:39:03 GMT (166kb)

Title: Correlated bosons on a lattice: Dynamical mean-field theory for

Bose-Einstein condensed and normal phases

Authors: Krzysztof Byczuk and Dieter Vollhardt

Categories: cond-mat.other quant-ph

Comments: 17 pages, 4 figures, extended version

\\ ( http://arxiv.org/abs/0706.0839 , 166kb)

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\\

arXiv:0710.1213

replaced with revised version Tue, 11 Mar 2008 13:36:21 GMT (117kb)

Title: Exploiting soliton decay and phase fluctuations in atom chip

interferometry of Bose-Einstein condensates

Authors: R.G. Scott, T.E. Judd, T.M. Fromhold

Categories: cond-mat.other

Comments: 5 pages, 5 figures

\\ ( http://arxiv.org/abs/0710.1213 , 117kb)

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\\

arXiv:0710.4493

replaced with revised version Tue, 11 Mar 2008 16:55:41 GMT (631kb)

Title: Transport of strong-coupling polarons in optical lattices

Authors: M. Bruderer, A. Klein, S. R. Clark, D. Jaksch

Categories: quant-ph

Comments: 25 pages, 6 figures

Journal-ref: New J. Phys. 10, 033015 (2008)

DOI: 10.1088/1367-2630/10/3/033015

\\ ( http://arxiv.org/abs/0710.4493 , 631kb)

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\\

arXiv:0706.4434

replaced with revised version Wed, 12 Mar 2008 09:52:21 GMT (75kb)

Title: Pairing of 1D Bose-Fermi mixtures with unequal masses

Authors: M. Rizzi, A. Imambekov

Categories: cond-mat.str-el cond-mat.other

Comments: 7 pages, 5 figures

Journal-ref: Phys. Rev. A 77, 023621 (2008) (6 pages)

DOI: 10.1103/PhysRevA.77.023621

\\ ( http://arxiv.org/abs/0706.4434 , 75kb)

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\\

arXiv:0803.1405

replaced with revised version Wed, 12 Mar 2008 04:10:59 GMT (311kb,D)

Title: Collisional Properties of p-Wave Feshbach Molecules

Authors: Yasuhisa Inada, Munekazu Horikoshi, Shuta Nakajima, Makoto

Kuwata-Gonokami, Masahito Ueda, Takashi Mukaiyama

Categories: cond-mat.other

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\ ( http://arxiv.org/abs/0803.1405 , 311kb)

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arXiv:0711.3006 (*cross-listing*)

replaced with revised version Wed, 12 Mar 2008 20:56:08 GMT (24kb,D)

Title: Strongly paired fermions: Cold atoms and neutron matter

Authors: Alexandros Gezerlis and J. Carlson

Categories: nucl-th cond-mat.other

Comments: 5 pages, 4 figures; 3 references added; v2 corresponds to the

published version

Report-no: LA-UR-07-7894

Journal-ref: Phys. Rev. C 77, 032801(R) (2008)

DOI: 10.1103/PhysRevC.77.032801

\\ ( http://arxiv.org/abs/0711.3006 , 24kb)

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\\

arXiv:0803.1430

replaced with revised version Thu, 13 Mar 2008 14:39:20 GMT (54kb)

Title: A dynamical theory of thermalization in composite quantum systems

Authors: Sumiyoshi Abe, A. R. Usha Devi, A. K. Rajagopal

Categories: cond-mat.stat-mech quant-ph

Comments: 14 pages, no figures. The title slightly changed

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\ ( http://arxiv.org/abs/0803.1430 , 54kb)

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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/ ========================================================================= Legal stuff: Unless stated otherwise, this e-mail represents only the views of the sender and not the views of the University of Queensland =========================================================================Received on Wed Apr 02 2008 - 09:39:35 EST

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