http://pra.aps.org/ Accepted Papers for Physical Review A en-us Copyright (c) 2008 The American Physical Society 2008-05-13T23:00:14-04:00 assocpub@aps.org rss@aps.org hourly 4 2008-05-13T23:00:14-04:00 rss@aps.org http://pra.aps.org/accepted/A/e707aYebYdc1331962df7354c4ff570e331ad4570 Spatial symmetries inherent to tight focus optical beams are applied to control the field phase generated at interfaces in nonlinear optical processes. We use these symmetries to obtain a background-free pure Raman spectrum in coherent anti-Stokes Raman scattering (CARS) spectroscopy from a resonant... David Gachet, Franck Billard and Herve Rigneault 2008-05-13T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review A Quantum optics, physics of lasers, nonlinear optics, classical optics Quantum optics, physics of lasers, nonlinear optics, classical optics http://pra.aps.org/accepted/A/9e07eN99X441980412ef9ed4fb7c449b6535c0e94 A numerical approach that allows for the solution of the time-dependent Schrödinger equation (TDSE) describing molecules exposed to intense short laser pulses was developed. The molecular response to the strong field is described within the single-active electron approximation (SAE). The method... Manohar Awasthi, Yulian V. Vanne, Alejandro Saenz, Alberto Castro and Piero Decleva 2008-05-13T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review A Atomic and molecular processes in external fields, including interactions with strong fields and short pulses Atomic and molecular processes in external fields, including interactions with strong fields and short pulses http://pra.aps.org/accepted/A/8807cY94Te319b0a08181a8281b752f6b94961133 We demonstrate that Byzantine Agreement (detectable broadcast) is also solvable in the continuous variable scenario with multipartite entangled Gaussian states and Gaussian operations (homodyne detection). Within this scheme we find that Byzantine Agreement requires a minimum amount of entanglement ... Rodion Neigovzen, Carles Rodo, Gerardo Adesso and Anna Sanpera 2008-05-13T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review A Quantum information Quantum information http://pra.aps.org/accepted/A/1907aY6bZ6d12718965e7315d102f7bf803be473d We investigate theoretically the energy levels of two identical Fermions in a harmonic potential trap under a p-wave Feshbach resonance. The magnetic fields needed to affect the energy levels differ strongly among the levels, and they can be at values far from the free space resonant field. S. K. Yip 2008-05-13T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review A Matter waves Matter waves http://pra.aps.org/accepted/A/f607eN5fX9312e0e543d1d793c5b3b52249a5b21a A sufficient condition for an electron density to be v-representable is suggested and a direct proof is presented. In Levy’s constrained search or Lieb’s ensemble constrained search, if the minimum is achieved by wave functions which satisfy the steadiness condition for current density and have cont... Ji Luo 2008-05-13T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review A Atomic and molecular structure and dynamics Atomic and molecular structure and dynamics http://pra.aps.org/accepted/A/80071YaeQ431d10cf9b850885c87371e2e12f7e28 We present experimental and theoretical results showing the improved beam quality and reduced divergence of an atom laser produced by an optical Raman transition, compared to one produced by an RF transition. We show that Raman outcoupling can eliminate the diverging lens effect that the condensate ... M. Jeppesen, J. Dugue, G. Dennis, M. T. Johnsson, C. Figl, N. P. Robins and J. D. Close 2008-05-13T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review A Matter waves Matter waves http://pra.aps.org/accepted/A/8907bNd4D8f1dc0833c00f211278dcd2377eee5ac 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.... Scott E. Hoffmann, Joel F. Corney and Peter D. Drummond 2008-05-13T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review A Matter waves Matter waves http://pra.aps.org/accepted/A/41077N13Dd51150cc20975e2b10d9ded7d5f78d6b We determine the exact many-body properties of a bosonic Tonks-Girardeau gas confined in a harmonic potential with a tunable d-function barrier at the trap center. This is done by calculating the reduced single particle density matrix, the pair-distribution function, and momentum distribution of the... J. Goold and Th. Busch 2008-05-13T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review A Matter waves Matter waves http://pra.aps.org/accepted/A/5d079NbdY741c30bb4e80013e954f446ff8d353ba The energy law giving the eigen energies of a -cn/Rn-cm/Rm potential (studied by LeRoy in 1980), is revisited. For n=3, m=6, an analytical law giving the density of states is deduced. In the context of weakly bound levels an energy law giving the vibrational number v versus the binding energy e is g... Haikel Jelassi, BrunoViaris deLesegno and Laurence Pruvost 2008-05-13T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review A Atomic and molecular structure and dynamics Atomic and molecular structure and dynamics http://pra.aps.org/accepted/A/5c073N28Dc81190052786482797864b5c704f85aa The stability of a linear AC trap for neutral polar molecules is investigated both theoretically and experimentally. While the overall stability is found to be well described by the linearized equations of motion within the usual framework of stability diagrams, instabilities similar to those observ... Peter Lutzow, Melanie Schnell and Gerard Meijer 2008-05-12T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review A Atomic and molecular processes in external fields, including interactions with strong fields and short pulses Atomic and molecular processes in external fields, including interactions with strong fields and short pulses http://pra.aps.org/accepted/A/1a076N68Z9c1e807c3265564b80776ac54029fbe3 We introduce a class of generalized geometric measures of entanglement. For pure quantum states of N elementary subsystems, they are defined as the distances from the sets of K-separable states (K=2,¼,N). The entire set of generalized geometric measures provides a quantification and hierarchical ord... M. Blasone, F. Dell Anno, S. De Siena and F. Illuminati 2008-05-12T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review A Quantum information Quantum information http://pra.aps.org/accepted/A/e5074N39Z1f11c0ac2602fd25445dc8c476840645 The response of a Nd3+:YAG laser is examined experimentally when the pump polarization direction is abruptly changed from one to the other stress-induced principal axis of the cavity. As a result, the laser output polarization changes direction but only after a significant delay. We numerically solv... Guy Verschaffelt, Guy Vander Sande, Jan Danckaert, Bernard Segard, Pierre Glorieux and Thomas Erneux 2008-05-12T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review A Quantum optics, physics of lasers, nonlinear optics, classical optics Quantum optics, physics of lasers, nonlinear optics, classical optics http://pra.aps.org/accepted/A/e9071NaeCe318e05c2910d19d3156534cda65393b The behaviors of one-dimensional quantum random walks are strikingly different from those of classical ones. However, when decoherence is involved, the limiting distributions take on many classical features over time. In this paper, we study the decoherence on both position and "coin" spaces of the ... Kai Zhang 2008-05-12T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review A Quantum information Quantum information http://pra.aps.org/accepted/A/34072N07Ed612802121e6c35a23d5cd82828144d8 Exact reduced dynamics for two independent qudits dephasingly coupled to a common zero-temperature, super-Ohmic bosonic environment is studied. It is shown that the qudit-qudit subsystem initially prepared in a separable state evolves into an entangled state. Details of entanglement origination depe... Jerzy Dajka and Jerzy Luczka 2008-05-12T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review A Quantum information Quantum information http://pra.aps.org/accepted/A/8807aY7cZ6b1e71ca7f32cd97cdd579bd1c6d3847 We study the dynamics of entanglement in the XY spin chain subject to a staggered magnetic field and contrast it to the previously discussed uniform field case. We find that in the isotropic (XX) limit a staggered field can provide almost equally favorable conditions for a high-fidelity transfer of ... R. H. Crooks and D. V. Khveshchenko 2008-05-12T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review A Quantum information Quantum information http://pra.aps.org/accepted/A/e9070NbaE1a1f503422214422e46f9b8c1591ce98 Doubly-resonant-multi-photon ionization of PbF has been achieved via the X1® A and A® D transitions. Excitation of the A to D state by narrow bandwidth laser radiation is found to have a cross section of sD=100±30 Mb. The ionization potential is found to be 7.55(1) eV, in agreement with ou... P. Sivakumar, C. P. McRaven, Dustin Combs, N. E. Shafer Ray and Victor Ezhov 2008-05-12T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review A Atomic and molecular structure and dynamics Atomic and molecular structure and dynamics http://pra.aps.org/accepted/A/d007dN34Z6d1940fc1f980a56158341323935978d We discuss the extent to which measured time-dependent fragment kinetic energy release (KER) spectra and calculated nuclear probability densities can reveal 1) the transition frequencies between stationary vibrational states, 2) the nodal structure of stationary vibrational states, 3) the ground-sta... Uwe Thumm, Thomas Niederhausen and Bernold Feuerstein 2008-05-12T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review A Atomic and molecular processes in external fields, including interactions with strong fields and short pulses Atomic and molecular processes in external fields, including interactions with strong fields and short pulses http://pra.aps.org/accepted/A/07074Y39X091a71706ff6d382e44918fb47922c57 We consider a system of quantum degenerate spin polarized fermions in a harmonic trap at zero temperature, interacting via dipole-dipole forces. We introduce a variational Wigner function to describe the deformation and compression of the Fermi gas in phase space and use it to examine the stability ... Takahiko Miyakawa, Takaaki Sogo and Pu Han 2008-05-09T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review A Matter waves Matter waves http://pra.aps.org/accepted/A/f9075Ye4Ac919302395003b4dc3da7c0059336ddb Yanpeng Zhang, Blake Anderson and Min Xiao 2008-05-09T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review A Quantum optics, physics of lasers, nonlinear optics, classical optics Quantum optics, physics of lasers, nonlinear optics, classical optics http://pra.aps.org/accepted/A/8507dN1bC3d19e05e28a4d4799d75bd7c9573a51e In the last few years there has been a lot of interest in quantum repeater protocols using only atomic ensembles and linear optics. Here we show that the local generation of high-fidelity entangled pairs of atomic excitations, in combination with the use of two-photon detections for long-distance en... Nicolas Sangouard, Christoph Simon, Bo Zhao, YuAo Chen, Hugues deRiedmatten, JianWei Pan and Nicolas Gisin 2008-05-09T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review A Quantum information Quantum information http://pra.aps.org/accepted/A/67079Nb0Dd61140c424e287648d7d15142166e116 We present the computation of two-photon transition spectra between ro-vibrational states of the H2+ molecular ion, including the effects of hyperfine structure and excitation polarization. The reduced two-photon matrix elements are obtained by means of a variational method. We discuss the implicati... JeanPhilippe Karr, Franck Bielsa, Albane Douillet, Jofre Pedregosa, Vladimir I. Korobov and Laurent Hilico 2008-05-09T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review A Atomic and molecular processes in external fields, including interactions with strong fields and short pulses Atomic and molecular processes in external fields, including interactions with strong fields and short pulses http://pra.aps.org/accepted/A/e207eN9cCf412c03223c3607f4cf58639de63a11d We have performed high-accuracy quantum mechanical calculations for the three lowest S-states of the beryllium ion (9Be+). The nonrelativistic part of the calculations was done with the variational approach and explicitly included the nuclear motion (i.e. the finite-nuclear-mass approach). The nonre... Monika Stanke, Jacek Komasa, Dariusz Kedziera, Sergiy Bubin and Ludwik Adamowicz 2008-05-09T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review A Atomic and molecular structure and dynamics Atomic and molecular structure and dynamics http://pra.aps.org/accepted/A/75078N6eCa61dc07523185c9134e4308d960916f6 The Lamb shift of a hydrogen atom due to the surface plasmon polariton (SPP) modes is calculated and we observe both band edge and surface enhancement. The atom sits inside a thin metal slab which is sandwiched by two semi-infinite dielectrics. The SPP dispersion relation shows a band gap if the two... Qingqing Sun, M. Al Amri, Ali Kamli and M.Suhail Zubairy 2008-05-09T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review A Atomic and molecular structure and dynamics Atomic and molecular structure and dynamics http://pra.aps.org/accepted/A/a6070NfbA72We710b0f724745ef77cfd42f6e4c2d It is a well known fact that the presence of material bodies in the vicinity of an atom affects its interaction with the always present quantized electromagnetic field. In this paper, we focus on how the spontaneous emission rate of a given excited atom is altered when this atom is placed inside a p... F. S. S. Rosa, T. N. C. Mendes, A. Tenorio and C. Farina 2008-05-09T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review A Fundamental concepts Fundamental concepts http://pra.aps.org/accepted/A/6207dN97De8Ece1cb0921eb2090e748bdfb2627df We analyse the rotation of bright solitary waves formed of atomic Bose-Einstein condensates with attractive atomic interactions. By employing a variational technique and assuming an irrotational quadrupolar flow field, we map out the variational solutions in the rotating frame. In particular, we sho... N. A. Jamaludin, N. G. Parker and A. M. Martin 2008-05-09T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review A Matter waves Matter waves