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

Date: Thu, 5 Oct 2006 15:02:07 +1000 (EST)

Date: Thu, 5 Oct 2006 15:02:07 +1000 (EST)

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

Hi all,

Sorry for the lateness of this week's email, lectures took priority

unfortunately. This week I am trialling sorting the papers into new and

resubmitted sections. There were 26 new papers last week (I am going to be

interested to see how this number fluctuates.)

Home page: http://www.physics.uq.edu.au/people/mdavis/matts_arXiv/

New abstracts:

------------------------------------------------------------------------------

\\

Paper: cond-mat/0609583

Date: Fri, 22 Sep 2006 16:08:07 GMT (25kb)

Title: Merging of single-particle levels in finite Fermi systems

Authors: V.A.Khodel, J.W.Clark, Haochen Li, M.V.Zverev

Comments: 4 pages, 2 figures

Subj-class: Strongly Correlated Electrons

\\

Properties of the distribution of single-particle levels adjacent to the

Fermi surface in finite Fermi systems are studied, focusing on the case in

which these levels are degenerate. The interaction of the quasiparticles

occupying these levels lifts the degeneracy and affects the distance between

the closest levels on opposite sides of the Fermi surface, as the number of

particles in the system is varied. In addition to the familiar scenario of

level crossing, a new phenomenon is uncovered, in which the merging of

single-particle levels results in the disappearance of well-defined

single-particle excitations. Implications of this finding are discussed for

nuclear, solid-state, and atomic systems.

\\ ( http://arXiv.org/abs/cond-mat/0609583 , 25kb)

------------------------------------------------------------------------------

\\

Paper: cond-mat/0609587

Date: Fri, 22 Sep 2006 17:18:09 GMT (329kb)

Title: Travelling to exotic places with ultracold atoms

Authors: M. Lewenstein, A. Kubasiak, J. Larson, C. Menotti, G. Morigi, K.

Osterloh, and A. Sanpera

Comments: 11 pages, 4 figures. The following article has been submitted to the

Proceedings of ICAP-2006 (Innsbruck)

Subj-class: Other

\\

We review and speculate on two recent developments of quantum optics and

ultracold atoms. First, we discuss a possible realization of "phonon" physics,

or as we call it "refracton" physics with optical lattices. To this aim we

combine the physics of cold atoms with cavity QED, and investigate

superfluid-Mott insulator quantum phase transition. The systems can exhibit

cavity mode modifications due to local changes of refraction index

("refractons"). Second, we discuss the physics of strongly correlated particles

in Abelian, and more interestingly in non-Abelian magnetic fields, using cold

atoms.

\\ ( http://arXiv.org/abs/cond-mat/0609587 , 329kb)

------------------------------------------------------------------------------

\\

Paper: physics/0609196

Date: Fri, 22 Sep 2006 19:45:34 GMT (644kb)

Title: Detection of radio frequency magnetic fields using nonlinear

magneto-optical rotation

Authors: M. P. Ledbetter, V. M. Acosta, S. M. Rochester, D. Budker, S.

Pustelny, V. V. Yashchuk

Comments: 6 pages, 6 figures

Subj-class: Atomic Physics

\\

We describe a room-temperature alkali-metal atomic magnetometer for detection

of small, high frequency magnetic fields. The magnetometer operates by

detecting optical rotation due to the precession of an aligned ground state in

the presence of a small oscillating magnetic field. The resonance frequency of

the magnetometer can be adjusted to any desired value by tuning the bias

magnetic field. We demonstrate a sensitivity of $100\thinspace{\rm

pG/\sqrt{Hz}\thinspace(RMS)}$ in a 3.5 cm diameter, paraffin coated cell. Based

on detection at the photon shot-noise limit, we project a sensitivity of

$20\thinspace{\rm pG/\sqrt{Hz}\thinspace(RMS)}$.

\\ ( http://arXiv.org/abs/physics/0609196 , 644kb)

------------------------------------------------------------------------------

\\

Paper: cond-mat/0609600

Date: Sat, 23 Sep 2006 04:08:54 GMT (87kb)

Title: On-site number statistics of ultracold lattice bosons

Authors: Barbara Capogrosso-Sansone, Evgeny Kozik, Nikolay Prokof'ev, Boris

Svistunov

Comments: 9 pages, 4 figures

Subj-class: Statistical Mechanics; Other

\\

We study on-site occupation number fluctuations in a system of interacting

bosons in an optical lattice. The ground-state distribution is obtained

analytically in the limiting cases of strong and weak interaction, and by means

of exact Monte Carlo simulations in the strongly correlated regime. As the

interaction is increased, the distribution evolves from Poissonian in the

non-interacting gas to a sharply peaked distribution in the Mott-insulator (MI)

regime. In the special case of large occupation numbers, we demonstrate

analytically and check numerically that there exists a wide interval of

interaction strength, in which the on-site number fluctuations remain Gaussian

and are gradually squeezed until they are of order unity near the superfluid

(SF)-MI transition. Recently, the on-site number statistics were studied

experimentally in a wide range of lattice potential depths [Phys. Rev. Lett.

\textbf{96}, 090401 (2006)]. In our simulations, we are able to directly

reproduce experimental conditions using temperature as the only free parameter.

Pronounced temperature dependence suggests that measurements of on-site atom

number fluctuations can be employed as a reliable method of thermometry in both

SF and MI regimes.

\\ ( http://arXiv.org/abs/cond-mat/0609600 , 87kb)

------------------------------------------------------------------------------

\\

Paper: cond-mat/0609604

Date: Sat, 23 Sep 2006 12:54:11 GMT (27kb)

Title: Mixture of bosonic and spin-polarized fermionic atoms in an optical

lattice

Authors: Lode Pollet, Corinna Kollath, Ulrich Schollwoeck, Matthias Troyer

Comments: 4 pages, 5 figures

Subj-class: Other; Statistical Mechanics

\\

We investigate the properties of Bose-Fermi mixtures for experimentally

relevant parameters in one dimension using numerical methods. We find that the

strong attractive interaction between the bosons and fermions leads to the

creat ion of polaronic particles. The effect of the fermions on the bosons is

not only to deepen the parabolic trapping potential, but also to reduce the

bosonic repulsion. This reduction would theoretically lead to an increase in

the bosonic visibility. The opposite was observed however in the experimental

87Rb - 40K systems, most likely due to a sharp rise in temperature.

\\ ( http://arXiv.org/abs/cond-mat/0609604 , 27kb)

------------------------------------------------------------------------------

\\

Paper: cond-mat/0609621

Date: Mon, 25 Sep 2006 01:29:15 GMT (3kb)

Title: Comments on ``Observation of Strong Quantum Depletion in a Gaseous

Bose-Einstein Condensate" [cond-mat/0601184]

Authors: Sang-Hoon Kim

Comments: 1 page, 0 figure

Subj-class: Statistical Mechanics

\\

We suggested a method to estimate the quantum depletion of interacting Bose

particles confined by a three dimensional harmonic trap.

\\ ( http://arXiv.org/abs/cond-mat/0609621 , 3kb)

------------------------------------------------------------------------------

\\

Paper: cond-mat/0609632

Date: Mon, 25 Sep 2006 12:01:31 GMT (7kb)

Title: Feshbach Resonance and Growth of a Bose-Einstein Condensate

Authors: C. Yuce and A. Kilic

Comments: 4 pages

Subj-class: Other

Journal-ref: Phys. Rev. A 74, 033609 (2006)

\\

Gross-Pitaevskii equation with gain is used to model Bose Einstein

condensation (BEC) fed by the surrounding thermal cloud. It is shown that the

number of atoms continuously injected into BEC from the reservoir can be

controlled by applying the external magnetic field via Feshbach resonance.

\\ ( http://arXiv.org/abs/cond-mat/0609632 , 7kb)

------------------------------------------------------------------------------

\\

Paper: quant-ph/0609189

Date: Mon, 25 Sep 2006 13:01:23 GMT (95kb)

Title: Quantum storage and cloning of light states in EIT-like medium

Authors: A. P. Alodjants, S. M. Arakelian

Comments: 13 pages, 4 postscript figures, uses ws-ijmpb.cls

Journal-ref: Int. J. of Modern Physics B, 20 (2006) 1593-1605

DOI: 10.1142/S0217979206034145

\\

In the paper we consider a new approach for storage and cloning of quantum

information by three level atomic (molecular) systems in the presence of the

electromagnetically induced transparency (EIT) effect. For that, the various

schemes of transformation into the bright and dark polaritons for quantum

states of optical field in the medium are proposed. Physical conditions of

realization of quantum nondemolition (QND) storage of quantum optical state are

formulated for the first time. We have shown that the best storage and cloning

of can be achieved with the atomic ensemble in the Bose-Einstein condensation

state. We discuss stimulated Raman two-color photoassociation for experimental

realization of the schemes under consideration.

\\ ( http://arXiv.org/abs/quant-ph/0609189 , 95kb)

------------------------------------------------------------------------------

\\

Paper: physics/0609203

Date: Fri, 22 Sep 2006 22:37:28 GMT (254kb)

Title: Exploring the phase space of the quantum delta kicked accelerator

Authors: G. Behinaein, V. Ramareddy, P. Ahmadi, and G.S. Summy

Comments: 4 pages, 5 figures

Subj-class: Atomic Physics

\\

We experimentally explore the underlying pseudo-classical phase space

structure of the quantum delta kicked accelerator. This was achieved by

exposing a Bose-Einstein condensate to the spatially corrugated potential

created by pulses of an off-resonant standing light wave. For the first time

quantum accelerator modes were realized in such a system. By utilizing the

narrow momentum distribution of the condensate we were able to observe the

discrete momentum state structure of a quantum accelerator mode.

\\ ( http://arXiv.org/abs/physics/0609203 , 254kb)

------------------------------------------------------------------------------

\\

Paper: physics/0609220

Date: Mon, 25 Sep 2006 05:35:15 GMT (76kb)

Title: Experimental verification of minima in excited long-range Rydberg states

of Rb_2

Authors: Chris H. Greene, Edward L. Hamilton, Heather Crowell, Cedomil Vadla,

and Kay Niemax

Comments: 3 figures, 5 pages in two-column format

Subj-class: Atomic Physics; Chemical Physics

\\

Recent theoretical studies with alkali atoms A$^{\ast}$ excited to high

Rydberg states predicted the existence of ultra long-range molecular bound

states. Such excited dimers have large electric dipole moments which, in

combination with their long radiative lifetimes, make them excellent candidates

for manipulation in applications. This letter reports on experimental

investigations of the self-broadening of Rb principal series lines, which

revealed multiple satellites in the line wings. The positions of the satellites

agree quantitatively with theoretically-predicted minima in the excited

long-range Rydberg states of Rb$_2$.

\\ ( http://arXiv.org/abs/physics/0609220 , 76kb)

------------------------------------------------------------------------------

\\

Paper: cond-mat/0609642

Date: Mon, 25 Sep 2006 21:50:00 GMT (585kb)

Title: Dynamics of vortex matter in rotating two-species Bose-Einstein

condensates

Authors: S. J. Woo, S. Choi, L. O. Baksmaty, and N. P. Bigelow

Subj-class: Other

\\

In a rotating two-component Bose-Einstein condensate (BEC), the traditional

triangular vortex lattice can be replaced by a rectangular vortex lattice or

even a structure characterized in terms of vortex sheets, depending on the

interspecies interactions. We study the dynamics of this system by analyzing

the Bogoliubov excitation spectrum. Excitations familiar to BEC vortex systems

are found such as Tkachenko modes, hydrodynamic modes and surface waves,

however, the complex two-component morphology also gives rise to new phenomena

including shear flow between vortex sheets.

\\ ( http://arXiv.org/abs/cond-mat/0609642 , 585kb)

------------------------------------------------------------------------------

\\

Paper: cond-mat/0609661

Date: Tue, 26 Sep 2006 09:58:33 GMT (343kb)

Title: Convergence rate of dimension reduction in Bose-Einstein condensates

Authors: Weizhu Bao, Yunyi Ge, Dieter Jaksch, Peter A. Markowich and Rada M.

Weishaeupl

Comments: 27pages; 9 figures

Subj-class: Materials Science

\\

In this paper, we study dimension reduction of the three-dimensional (3D)

Gross-Pitaevskii equation

(GPE) modelling Bose-Einstein condensation under different limiting

interaction and trapping frequencies parameter regimes.

Convergence rates for the dimension reduction of 3D ground state and dynamics

of the GPE in the case of disk-shaped condensation and cigar-shaped

condensation are reported based on our asymptotic and numerical results. In

addition, the parameter regimes in which the 3D GPE cannot be reduced to lower

dimensions are identified.

\\ ( http://arXiv.org/abs/cond-mat/0609661 , 343kb)

------------------------------------------------------------------------------

\\

Paper: cond-mat/0609668

Date: Tue, 26 Sep 2006 14:17:03 GMT (13kb)

Title: Exact results for the Spectra of Bosons and Fermions with Contact

Interaction

Authors: Stefan Mashkevich (Schrodinger, New York / University, Kiev), Sergey

Matveenko (Landau Inst., Moscow), St\'ephane Ouvry (LPTMS, Orsay)

Comments: 16 pages, LaTeX 2e

Subj-class: Mesoscopic Systems and Quantum Hall Effect; Strongly Correlated

Electrons

\\

An N-body bosonic model with delta-contact interactions projected on the

lowest Landau level is considered. For a given number of particles in a given

angular momentum sector, any energy level can be obtained exactly by means of

diagonalizing a finite matrix: they are roots of algebraic equations. A

complete solution of the three-body problem is presented, some general

properties of the N-body spectrum are pointed out, and a number of novel exact

analytic eigenstates are obtained. The FQHE N-fermion model with

Laplacian-delta interactions is also considered along the same lines of

analysis. New exact eigenstates are proposed, along with the Slater

determinant, whose eigenvalues are shown to be related to Catalan numbers.

\\ ( http://arXiv.org/abs/cond-mat/0609668 , 13kb)

------------------------------------------------------------------------------

\\

Paper: quant-ph/0609202

Date: Tue, 26 Sep 2006 19:49:29 GMT (45kb)

Title: Loschmidt echo in the Bose-Hubbard model: turning back time in an

optical lattice

Authors: Fernando M. Cucchietti

Report-no: LA-UR-06-5903

\\

I show how to perform a Loschmidt echo (time reversal) in the Bose-Hubbard

model implemented with cold bosonic atoms in an optical lattice. The echo is

obtained by applying a linear phase imprint on the lattice and a change in

magnetic field to tune the boson-boson scattering length through a Feshbach

resonance. I discuss how the echo can measure the fidelity of the quantum

simulation, the intensity of an external potential (e.g. gravity), or the

critical point of the superfluid-insulator quantum phase transition.

\\ ( http://arXiv.org/abs/quant-ph/0609202 , 45kb)

------------------------------------------------------------------------------

\\

Paper: quant-ph/0609178

Date: Fri, 22 Sep 2006 20:00:22 GMT (406kb)

Title: Coexistence of unlimited bipartite and multipartite

Einstein-Podolsky-Rosen entanglement

Authors: Gerardo Adesso, Marie Ericsson, Fabrizio Illuminati

Comments: 12 pages + 3 figures

Subj-class: Quantum Physics; Mathematical Physics; Optics; Other

\\

Quantum mechanics imposes 'monogamy' constraints on the sharing of

entanglement. We show that, despite these limitations, entanglement can be

simultaneously present in unlimited two-body and many-body forms in continuous

variable systems. This is demonstrated in experimentally producible multimode

states of light fields or atomic ensembles, which therefore enable infinitely

more freedom in the distribution of information, as opposed to system of qubits

where such entanglement structure is impossible. This is a central finding for

the quantification, understanding and potential exploitation of shared quantum

correlations, and may lead to novel realisations of robust multiparty

communication networks and scalable quantum computation.

\\ ( http://arXiv.org/abs/quant-ph/0609178 , 406kb)

------------------------------------------------------------------------------

\\

Paper: cond-mat/0609678

Date: Wed, 27 Sep 2006 02:06:00 GMT (284kb)

Title: An efficient and spectrally accurate numerical method for computing

dynamics of rotating Bose-Einstein condensates

Authors: Weizhu Bao, Hanquan Wang

Comments: 21 pages; 7 figures

Subj-class: Other

Journal-ref: J. Comput. Phys., Vol. 217, No. 2, 2006, pp. 612-626

\\

In this paper, we propose an efficient and spectrally accurate numerical

method for computing the dynamics of rotating Bose-Einstein condensates (BEC)

in two dimensions (2D) and 3D based on the Gross-Pitaevskii equation (GPE) with

an angular momentum rotation term. By applying a time-splitting technique for

decoupling the nonlinearity and properly using the alternating direction

implicit (ADI) technique for the coupling in the angular momentum rotation term

in the GPE, at every time step, the GPE in rotational frame is decoupled into a

nonlinear ordinary differential equation (ODE) and two partial differential

equations with constant coefficients. This allows us to develop new

time-splitting spectral (TSSP) methods for computing the dynamics of BEC in a

rotational frame.The new numerical method is explicit, unconditionally stable,

and of spectral accuracy in space and second order accuracy in time. Moreover,

it is time reversible and time transverse invariant, and conserves the position

density in the discretized level if the GPE does. Extensive numerical results

are presented to confirm the above properties of the new numerical method for

rotating BEC in 2D and 3D.

\\ ( http://arXiv.org/abs/cond-mat/0609678 , 284kb)

------------------------------------------------------------------------------

\\

Paper: cond-mat/0609681

Date: Wed, 27 Sep 2006 07:11:18 GMT (102kb)

Title: Number Statistics of Ultracold Bosons in Optical Lattice

Authors: Yu Chuan Wen, Jing Yu Gan, Xiancong Lu, Yue Yu

Comments: 5 pages, 4 figures

Subj-class: Strongly Correlated Electrons

\\

We study the number statistics of ultracold bosons in optical Lattice using

the slave particle technique and quantum Monte Carlo simulations. For

homogeneous Bose-Hubbard model, we use the slave particle technique to obtain

the number statistics near the superfluid to normal-liquid phase transition.

The qualitatively behavior agree with the recent experiment probing number

fluctuation [Phys. Rev. Lett. \textbf{96}, 090401 (2006)]. We also perform

quantum Monte Carlo simulations to 1D system with external harmonic trap. The

results qualitatively agree with the experiments.

\\ ( http://arXiv.org/abs/cond-mat/0609681 , 102kb)

------------------------------------------------------------------------------

\\

Paper: cond-mat/0609683

Date: Wed, 27 Sep 2006 07:58:21 GMT (287kb)

Title: Bose-Einstein condensates in accelerated double-periodic optical

lattices: Coupling and Crossing of resonances

Authors: D. Witthaut, E. M. Graefe, S. Wimberger, H. J. Korsch

Comments: 12 pages, 17 figures

Subj-class: Other

\\

We study the properties of coupled linear and nonlinear resonances. The

fundamental phenomena and the level crossing scenarios are introduced for a

nonlinear two-level system with one decaying state, describing the dynamics of

a Bose-Einstein condensate in a mean-field approximation (Gross-Pitaevskii or

nonlinear Schroedinger equation). An important application of the discussed

concepts is the dynamics of a condensate in tilted optical lattices. In

particular the properties of resonance eigenstates in double-periodic lattices

are discussed, in the linear case as well as within mean-field theory. The

decay is strongly altered, if an additional period-doubled lattice is

introduced. Our analytic study is supported by numerical computations of

nonlinear resonance states, and future applications of our findings for

experiments with ultracold atoms are discussed.

\\ ( http://arXiv.org/abs/cond-mat/0609683 , 287kb)

------------------------------------------------------------------------------

\\

Paper: cond-mat/0609685

Date: Wed, 27 Sep 2006 19:47:21 GMT (274kb)

Title: Criterion for bosonic superfluidity in an optical lattice

Authors: Roberto B. Diener, Qi Zhou, Hui Zhai, and Tin-Lun Ho

Comments: 4 pages, 2 figures

Subj-class: Other

\\

We show that the current method of determining superfluidity in optical

lattices based on a visibly "sharp" bosonic momentum distribution $n({\bf k})$

can be misleading, for even a {\em normal} Bose gas can have a similarly

"sharp" $n({\bf k})$. We show that superfluidity can be detected from the

so-called "'visibility" $(v)$ of $n({\bf k})$ $-$ that $v$ must be 1 within

$O(N^{-2/3})$, where $N$ is the number of bosons. Many current experiments,

however, have interpreted states with $v<1$ as superfluid. Such states are in

fact normal, reflecting strong temperature effects in the system. These normal

states, however, allow one to explore the physics in the quantum critical

regime.

\\ ( http://arXiv.org/abs/cond-mat/0609685 , 274kb)

------------------------------------------------------------------------------

\\

Paper: cond-mat/0609692

Date: Wed, 27 Sep 2006 11:48:06 GMT (30kb)

Title: Phase diagram of a dilute fermion gas with density imbalance

Authors: C.-H. Pao, S.-T. Wu, and S.-K. Yip

Comments: Proceeding for M$^2$S-HTSC VIII meeting, July 9-14 2006, Dresden; To

appear in Physica C

Subj-class: Other; Superconductivity

\\

We map out the phase diagram of a dilute two-component atomic fermion gas

with unequal populations and masses under a Feshbach resonance. As in the case

of equal masses, no uniform phase is stable for an intermediate coupling

regime. For majority component heavier, the unstable region moves towards the

BEC side. When the coupling strength is increased from the normal phase, there

is an increased parameter space where the transition is into the FFLO state.

The converse is true if the majority is light.

\\ ( http://arXiv.org/abs/cond-mat/0609692 , 30kb)

------------------------------------------------------------------------------

\\

Paper: cond-mat/0609703

Date: Wed, 27 Sep 2006 13:58:13 GMT (62kb)

Title: Coherent control of a self-trapped Bose-Einstein condensate

Authors: C.E. Creffield

Comments: 4 pages, 5 EPS figures

Subj-class: Other

\\

We study the behavior of a Bose-Einstein condensate held in an optical

lattice. We first show how a self-trapping transition can be induced in the

system by either increasing the number of atoms occupying a lattice site, or by

raising the interaction strength above a critical value. We then investigate

how applying a periodic driving potential to the self-trapped state can be used

to coherently control the emission of a precise number of correlated bosons

from the trapping-site. This allows the formation and transport of entangled

bosonic states, which are of great relevance to novel technologies such as

quantum information processing.

\\ ( http://arXiv.org/abs/cond-mat/0609703 , 62kb)

------------------------------------------------------------------------------

\\

Paper: cond-mat/0609706

Date: Wed, 27 Sep 2006 14:29:44 GMT (20kb)

Title: Interacting bosons in a nearly-resonant potential well

Authors: Joseph P. Straley and Eugene B. Kolomeisky

Comments: 4 pages, 3 figures

Subj-class: Other

\\

We establish that the ability of a localized attractive potential to bind

weakly-interacting bosons is dramatically enhanced in the vicinity of the

threshold of formation of the single-particle bound-state of the well.

Specifically, for repulsive particles and a super-threshold well the

equilibrium number of bound bosons diverges upon approaching the

single-particle threshold from above. For attractive interactions and a

sub-threshold well a collective bound state always forms for a sufficiently

large number of bosons despite the inability of interparticle attraction alone

to form a two-body bound state.

\\ ( http://arXiv.org/abs/cond-mat/0609706 , 20kb)

------------------------------------------------------------------------------

\\

Paper: cond-mat/0609711

Date: Wed, 27 Sep 2006 16:35:46 GMT (20kb)

Title: Superfluidity as a quantum exchange effect

Authors: Yongle Yu

Comments: 5 pages, 4 figures

Subj-class: Statistical Mechanics

\\

We show that superfluidity of a Bose system with a repulsive interaction is a

quantum exchange effect. As the strength of the interaction increases, the

critical velocity is increased and superfluidity is enhanced. Since the

interaction also depletes the Bose-Einstein condensate, Bose-Einstein

condensation and superfluidity are not only independent of each other, but are

affected by the interaction strength in the opposite way.

\\ ( http://arXiv.org/abs/cond-mat/0609711 , 20kb)

------------------------------------------------------------------------------

\\

Paper: quant-ph/0609208

Date: Wed, 27 Sep 2006 09:57:49 GMT (221kb)

Title: Continuous transfer and laser guiding between two cold atom traps

Authors: Emiliya Dimova (LAC), Olivier Morizot (LPL), Guillaume Stern (LAC),

Carlos L. Garrido Alzar (LPL), Andrea Fioretti (LAC), Vincent Lorent (LPL),

Daniel Comparat (LAC), H\'{e}l\`{e}ne Perrin (LPL), Pierre Pillet (LAC)

Comments: 10 pages, 8 figures

Proxy: ccsd ccsd-00101449

\\

We have demonstrated and modeled a simple and efficient method to transfer

atoms from a first Magneto-Optical Trap (MOT) to a second one. Two independent

setups, with cesium and rubidium atoms respectively, have shown that a high

power and slightly diverging laser beam optimizes the transfer between the two

traps when its frequency is red-detuned from the atomic transition. This

pushing laser extracts a continuous beam of slow and cold atoms out of the

first MOT and also provides a guiding to the second one through the dipolar

force. In order to optimize the transfer efficiency, the dependence of the

atomic flux on the pushing laser parameters (power, detuning, divergence and

waist) is investigated. The atomic flux is found to be proportional to the

first MOT loading rate. Experimentally, the transfer efficiency reaches 70%,

corresponding to a transfer rate up to 2.7x10^8 atoms/s with a final velocity

of 5.5 m/s. We present a simple analysis of the atomic motion inside the

pushing--guiding laser, in good agreement with the experimental data.

\\ ( http://arXiv.org/abs/quant-ph/0609208 , 221kb)

------------------------------------------------------------------------------

\\

Paper: cond-mat/0609725

Date: Thu, 28 Sep 2006 10:13:02 GMT (121kb)

Title: Association of molecules using a resonantly modulated magnetic field

Authors: Thomas M. Hanna, Thorsten Koehler, and Keith Burnett

Comments: 8 pages, 8 figures

Subj-class: Other

\\

We study the process of associating molecules from atomic gases using a

magnetic field modulation that is resonant with the molecular binding energy.

We show that maximal conversion is obtained by optimising the amplitude and

frequency of the modulation for the particular temperature and density of the

gas. For small modulation amplitudes, resonant coupling of an unbound atom pair

to a molecule occurs at a modulation frequency corresponding to the sum of the

molecular binding energy and the relative kinetic energy of the atom pair. An

atom pair with an off-resonant energy has a probability of association which

oscillates with a frequency and time-varying amplitude which are primarily

dependent on its detuning. Increasing the amplitude of the modulation tends to

result in less energetic atom pairs being resonantly coupled to the molecular

state, and also alters the dynamics of the transfer from continuum states with

off-resonant energies. This leads to maxima and minima in the total conversion

from the gas as a function of the modulation amplitude. Increasing the

temperature of the gas leads to an increase in the modulation frequency

providing the best fit to the thermal distribution, and weakens the resonant

frequency dependence of the conversion. Mean-field effects can alter the

optimal modulation frequency and lead to the excitation of higher modes. Our

simulations predict that resonant association can be effective for binding

energies of order $h \times 1$ MHz.

\\ ( http://arXiv.org/abs/cond-mat/0609725 , 121kb)

------------------------------------------------------------------------------

\\

Paper: quant-ph/0609214

Date: Wed, 27 Sep 2006 20:51:22 GMT (363kb)

Title: Long-distance teleportation of atomic qubit via optical interferometry

Authors: Y. P. Huang, M. G. Moore

\\

The problem of long-distance teleportation of single-atom qubits via a common

photonic channel is examined within the framework of a Mach-Zender optical

interferometer. As expected, when a coherent state is used as input, a

high-finesse optical cavity is required to overcome sensitivity to spontaneous

emission. However, we find that a number-squeezed light field in a twin-Fock

state can in principle create useful entanglement without cavity-enhancement.

Both approaches require single photon counting detectors, and best results are

obtained by combining cavity-feedback with twin-fock inputs. Such an approach

may allow a fidelity of $.99$ using a two-photon input and currently available

mirror and detector technology. In addition, the present approach can be

conveniently extended to generate multi-site entanglement and entanglement

swapping, both of which are necessities in quantum networks.

\\ ( http://arXiv.org/abs/quant-ph/0609214 , 363kb)

------------------------------------------------------------------------------

Updated preprints:

------------------------------------------------------------------------------

\\

Paper: cond-mat/0603479

replaced with revised version Fri, 22 Sep 2006 08:27:53 GMT (9kb)

Title: Ground state energy density of a dilute Bose gas in the canonical

transformation

Authors: Hyun Sik Noh, Sang-Hoon Kim, Chul Koo Kim, and Mukunda P. Das

Comments: 5 pages, 0 figure. submitted to Phys. Rev. A

Subj-class: Statistical Mechanics

\\ ( http://arXiv.org/abs/cond-mat/0603479 , 9kb)

------------------------------------------------------------------------------

\\

Paper: cond-mat/0609468

replaced with revised version Fri, 22 Sep 2006 09:12:11 GMT (196kb)

Title: Solitons in a trapped spin-1 atomic condensate

Authors: Wenxian Zhang,\"O. E. M\"ustecapl{\i}o\u{g}lu, and L. You

Comments: 8 pages, 8 color eps figures

Subj-class: Other

\\ ( http://arXiv.org/abs/cond-mat/0609468 , 196kb)

-----------------------------------------------------------------------------

\\

Paper: quant-ph/0508186

replaced with revised version Fri, 22 Sep 2006 08:00:02 GMT (55kb)

Title: Atomic density of an harmonically trapped ideal gas near Bose-Einstein

transition temperature

Authors: Rodolphe Hoppeler (LCFIO), Jose Viana Gomes (LCFIO), Denis Boiron

(LCFIO)

Proxy: ccsd ccsd-00008200

\\ ( http://arXiv.org/abs/quant-ph/0508186 , 55kb)

------------------------------------------------------------------------------

\\

Paper: cond-mat/0603340

replaced with revised version Tue, 26 Sep 2006 02:38:03 GMT (25kb)

Title: Calogero-Sutherland gas of ultracold Bose atoms

Authors: Yue Yu

Comments: 4 pages,1 figure,update version

Subj-class: Other; Statistical Mechanics; Mathematical Physics

\\ ( http://arXiv.org/abs/cond-mat/0603340 , 25kb)

------------------------------------------------------------------------------

\\

Paper: cond-mat/0604339

replaced with revised version Tue, 26 Sep 2006 09:05:50 GMT (587kb)

Title: Generic Phase Diagram of Fermion Superfluids with Population Imbalance

Authors: K. Machida, T. Mizushima, M. Ichioka

Comments: 5 pages, 5 figures, replaced by the version to appear in PRL

Subj-class: Superconductivity

Journal-ref: Phys. Rev. Lett. 97, 120407 (2006)

\\ ( http://arXiv.org/abs/cond-mat/0604339 , 587kb)

------------------------------------------------------------------------------

\\

Paper: cond-mat/0605581

replaced with revised version Wed, 27 Sep 2006 19:57:57 GMT (76kb)

Title: Response to Comment on "Pairing and Phase Separation in a Polarized

Fermi Gas"

Authors: Guthrie B. Partridge, Wenhui Li, Ramsey I. Kamar, Yean-An Liao, and

Randall G. Hulet

Subj-class: Superconductivity; Strongly Correlated Electrons

\\ ( http://arXiv.org/abs/cond-mat/0605581 , 76kb)

------------------------------------------------------------------------------

\\

Paper: cond-mat/0607102

replaced with revised version Wed, 27 Sep 2006 11:02:25 GMT (536kb)

Title: Observing the Formation of Long-range Order during Bose-Einstein

Condensation

Authors: Stephan Ritter, Anton \"Ottl, Tobias Donner, Thomas Bourdel, Michael

K\"ohl, Tilman Esslinger

Comments: 4 pages, 4 figures; revised version contains new data on the momentum

distribution of the gas

Subj-class: Statistical Mechanics

\\ ( http://arXiv.org/abs/cond-mat/0607102 , 536kb)

------------------------------------------------------------------------------

\\

Paper: quant-ph/0605234

replaced with revised version Wed, 27 Sep 2006 20:35:06 GMT (322kb)

Title: Integration of fiber coupled high-Q silicon nitride microdisks with atom

chips

Authors: Paul E. Barclay, Benjamin Lev, Kartik Srinivasan, Oskar Painter, Hideo

Mabuchi

Comments: Published vesion. Minor changes

Subj-class: Quantum Physics; Optics

Journal-ref: Appl. Phys. Lett. 89, 131108 (2006)

DOI: 10.1063/1.2356892

\\ ( http://arXiv.org/abs/quant-ph/0605234 , 322kb)

------------------------------------------------------------------------------

Till next week,

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 Thu Oct 05 2006 - 15:02:07 EST

*
This archive was generated by hypermail 2.2.0
: Thu May 08 2008 - 11:51:41 EST
*