Physical Review A

Physical Review A

Recent articles in Physical Review A
Coherent excitation of a two-level atom driven by a far-off-resonant classical field: Analytical solutions Author(s): Pankaj K. Jha and Yuri V. Rostovtsev We present an analytical treatment of coherent excitation of a two-level atom driven by a far-off-resonant classical field. A class of pulse envelope is obtained for which this problem is exactly solvable. The solutions are given in terms of the Heun function, which is a generalization of the hyperg... [Phys. Rev. A 81, 033827] Published Mon Mar 15, 2010 Effects of noise and parameter deviations in a bichromatic Raman white light cavity Author(s): Qingqing Sun, M. Selim Shahriar, and M. Suhail Zubairy We analyze the effects of noise and parameter deviations in a bichromatic Raman type white light cavity, with potential applications in precision measurements. The results show that the dispersion variation induced by parameter deviation can be controlled with an accuracy of 10^{-4} . The laser phas... [Phys. Rev. A 81, 033826] Published Mon Mar 15, 2010 Optical angular momentum: Multipole transitions and photonics Author(s): David L. Andrews The premise that multipolar decay should produce photons uniquely imprinted with a measurably corresponding angular momentum is shown in general to be untrue. To assume a one-to-one correlation between the transition multipoles involved in source decay and detector excitation is to impose a generall... [Phys. Rev. A 81, 033825] Published Mon Mar 15, 2010 BCS-BEC crossover with unequal-mass fermions Author(s): Roberto B. Diener and Mohit Randeria We investigate the crossover from BCS pairing to molecular Bose-Einstein condensation (BEC) in an atomic gas with two fermion species with masses m_{↑} ≠m_{↓} tuned through a Feshbach resonance. We present results for the T=0 equation of state as a function of the scattering length including t... [Phys. Rev. A 81, 033608] Published Mon Mar 15, 2010 Light-induced atomic desorption and diffusion of Rb from porous alumina Author(s): S. Villalba, H. Failache, and A. Lezama We present a study of light-induced atom desorption (LIAD) of an alkali-metal atom (Rb) in porous alumina. We observe the variation due to LIAD of the rubidium density in a vapor cell as a function of illumination time, intensity, and wavelength. The simple and regular structure of the alumina pores... [Phys. Rev. A 81, 032901] Published Mon Mar 15, 2010 Multilevel Holstein-Primakoff approximation and its application to atomic spin squeezing and ensemble quantum memories Author(s): Z. Kurucz and K. Mølmer We show that an ensemble of identical d-level atoms can be efficiently described by d-1 collective oscillator degrees of freedom in the vicinity of a product state with all atoms in the same, but otherwise arbitrary single-particle state. We apply our description to two different kinds of spin squee... [Phys. Rev. A 81, 032314] Published Mon Mar 15, 2010 Quantum information encoding, protection, and correction from trace-norm isometries Author(s): Francesco Ticozzi and Lorenza Viola We introduce the notion of trace-norm isometric encoding and explore its implications for passive and active methods for protecting quantum information against errors. Beside providing an operational foundation to the “subsystems principle” [E. Knill, Phys. Rev. A 74, 042301 (2006)] for faithful... [Phys. Rev. A 81, 032313] Published Mon Mar 15, 2010 Testing nonlocal realism with entangled coherent states Author(s): Mauro Paternostro and Hyunseok Jeong We investigate the violation of nonlocal realism using entangled coherent states (ECSs) under nonlinear operations and homodyne measurements. We address recently proposed Leggett-type inequalities, including a class of optimized incompatibility inequalities proposed by Branciard [Nature Phys. 4, 681... [Phys. Rev. A 81, 032115] Published Mon Mar 15, 2010 Geometric phase of a central spin coupled to an antiferromagnetic environment Author(s): Xiao-Zhong Yuan, Hsi-Sheng Goan, and Ka-Di Zhu Using the spin-wave approximation, we study the geometric phase (GP) of a central spin (signal qubit) coupled to an antiferromagnetic (AF) environment under the application of an external global magnetic field. The external magnetic field affects the GP of the qubit directly and also indirectly thro... [Phys. Rev. A 81, 034102] Published Fri Mar 12, 2010 Collapse of ultrashort spatiotemporal pulses described by the cubic generalized Kadomtsev-Petviashvili equation Author(s): Hervé Leblond, David Kremer, and Dumitru Mihalache By using a reductive perturbation method, we derive from Maxwell-Bloch equations a cubic generalized Kadomtsev-Petviashvili equation for ultrashort spatiotemporal optical pulse propagation in cubic (Kerr-like) media without the use of the slowly varying envelope approximation. We calculate the colla... [Phys. Rev. A 81, 033824] Published Fri Mar 12, 2010 Two-component Bose-Einstein condensates in D-dimensional optical lattices Author(s): Jian-Jun Wang, Ai-Xia Zhang, Ke-Zhi Zhang, Juan Ma, and Ju-Kui Xue The impurity-induced self-trapping and stable moving soliton and breather of two-component Bose-Einstein condensates (BEC’s) in deep D-dimensional optical lattices are discussed both analytically and numerically. Under the tight-binding approximation and within a time-dependent variational approac... [Phys. Rev. A 81, 033607] Published Fri Mar 12, 2010 Dark soliton decay due to trap anharmonicity in atomic Bose-Einstein condensates Author(s): N. G. Parker, N. P. Proukakis, and C. S. Adams A number of recent experiments with nearly pure atomic Bose-Einstein condensates have confirmed the predicted dark soliton oscillations when under harmonic trapping. However, a dark soliton propagating in an inhomogeneous condensate has also been predicted to be unstable to the emission of sound wav... [Phys. Rev. A 81, 033606] Published Fri Mar 12, 2010 Small phase-space structures and their relevance to pulsed quantum evolution: Stepwise ionization of the excited hydrogen atom in a microwave pulse Author(s): Luca C. Perotti Experiments have shown that the microwave ionization probability of a highly excited, almost monodimensional, hydrogen atom subjected to a microwave pulse sometimes grows in steps when the peak electric field of the pulse is increased. Classical pulsed simulations display the same steps, which have ... [Phys. Rev. A 81, 033407] Published Fri Mar 12, 2010 Linewidth and lifetime of atomic levels and the time evolution of spectra and coincidence spectra Author(s): Ying-Chih Chiang, Philipp V. Demekhin, Alexander I. Kuleff, Simona Scheit, and Lorenz S. Cederbaum The time-dependent theory of an atomic cascade decay process is discussed. We show that it is useful to measure the spectra of the emitted particles (electrons or photons) as a function of time and introduce time-dependent spectra and time-dependent coincidence spectra. The analysis reveals that the... [Phys. Rev. A 81, 032511] Published Fri Mar 12, 2010 Parity violation in atomic ytterbium: Experimental sensitivity and systematics Author(s): K. Tsigutkin, D. Dounas-Frazer, A. Family, J. E. Stalnaker, V. V. Yashchuk, and D. Budker We present a detailed description of the observation of parity violation in the ^{1} S_{0} -^{3} D_{1} 408-nm forbidden transition of ytterbium, a brief report of which appeared earlier. Linearly polarized 408-nm light interacts with Yb atoms in crossed E and B fields. The probability of the 408-nm ... [Phys. Rev. A 81, 032114] Published Fri Mar 12, 2010 Pitchfork bifurcations in blood-cell-shaped dipolar Bose-Einstein condensates Author(s): Stefan Rau, Jörg Main, Patrick Köberle, and Günter Wunner We demonstrate that the method of coupled Gaussian wave packets is a full-fledged alternative to direct numerical solutions of the Gross-Pitaevskii equation of condensates with electromagnetically induced attractive 1/r interaction or with dipole-dipole interaction. Moreover, Gaussian wave packets a... [Phys. Rev. A 81, 031605] Published Fri Mar 12, 2010 Erratum: Reexamination of the helium fine structure [Phys. Rev. A 79, 062516 (2009)] Author(s): Krzysztof Pachucki and Vladimir A. Yerokhin [Phys. Rev. A 81, 039903] Published Thu Mar 11, 2010 Feasibility of Bell tests with the W state Author(s): Amine Laghaout and Gunnar Björk The feasibility of Bell tests depends to a large extent on the tradeoff of difficulty between the preparation and the measurement of entangled systems. Polarization-entangled systems, though easy to measure, pose a relative challenge in their preparation. The opposite holds with entangled energy eig... [Phys. Rev. A 81, 033823] Published Thu Mar 11, 2010 Decay of stationary light pulses in ultracold atoms Author(s): Jin-Hui Wu, M. Artoni, and G. C. La Rocca We develop a general scheme for studying the optical response of ultracold atoms driven into a regime of standing-wave electromagnetically induced transparency. We rely on full numerical solutions of the Maxwell-Liouville equations without invoking secular and adiabatic approximations and arbitrary ... [Phys. Rev. A 81, 033822] Published Thu Mar 11, 2010 Generation of tunable and broadband far-infrared laser pulses during two-color filamentation Author(s): Francis Théberge, Marc Châteauneuf, Gilles Roy, Pierre Mathieu, and Jacques Dubois Tunable far-infrared laser pulses were generated efficiently during two-color filamentation in air. Understanding the creation of few-cycle far-infrared laser pulses is important since it is at the frontier between two possible generation mechanisms. The first one is the four-wave mixing generation,... [Phys. Rev. A 81, 033821] Published Thu Mar 11, 2010 Transient low-frequency fluctuations in semiconductor lasers with optical feedback Author(s): J. Zamora-Munt, C. Masoller, and J. García-Ojalvo Time-delayed systems often exhibit multistability of coexisting attractors, which can result in long chaotic transients on the way to one of the coexisting states. Strong enough noise can transform this transient chaos into noise-sustained dynamics. Here we study the interplay between delay-induced ... [Phys. Rev. A 81, 033820] Published Thu Mar 11, 2010 Effects of photon losses on phase estimation near the Heisenberg limit using coherent light and squeezed vacuum Author(s): Takafumi Ono and Holger F. Hofmann Two-path interferometry with coherent states and a squeezed vacuum can achieve phase sensitivities close to the Heisenberg limit when the average photon number of the squeezed vacuum is close to the average photon number of the coherent light. Here, we investigate the phase sensitivity of such state... [Phys. Rev. A 81, 033819] Published Thu Mar 11, 2010 Light cone dynamics and reverse Kibble-Zurek mechanism in two-dimensional superfluids following a quantum quench Author(s): L. Mathey and A. Polkovnikov We study the dynamics of the relative phase of a bilayer of two-dimensional superfluids after the two superfluids have been decoupled. We find that on short time scales the relative phase shows “light cone”-like dynamics and creates a metastable superfluid state, which can be supercritical. We a... [Phys. Rev. A 81, 033605] Published Thu Mar 11, 2010 Robust entanglement in antiferromagnetic Heisenberg chains by single-spin optimal control Author(s): Xiaoting Wang, Abolfazl Bayat, S. G. Schirmer, and Sougato Bose We demonstrate how near-perfect entanglement (in fact arbitrarily close to maximal entanglement) can be generated between the end spins of an antiferromagnetic isotropic Heisenberg chain of length N, starting from the ground state in the N/2 excitation subspace, by applying a magnetic field along a ... [Phys. Rev. A 81, 032312] Published Thu Mar 11, 2010 Universality of the negativity in the Lipkin-Meshkov-Glick model Author(s): Hannu Wichterich, Julien Vidal, and Sougato Bose The entanglement between noncomplementary blocks of a many-body system, where a part of the system forms an ignored environment, is a largely untouched problem without analytic results. We rectify this gap by studying the logarithmic negativity between two macroscopic sets of spins in an arbitrary t... [Phys. Rev. A 81, 032311] Published Thu Mar 11, 2010 Protection of quantum information and optimal singlet conversion through higher-dimensional quantum systems and environment monitoring Author(s): E. Mascarenhas, B. Marques, D. Cavalcanti, M. Terra Cunha, and M. França Santos We study how to protect quantum information in quantum systems subjected to local dissipation. We show that combining the use of three-level systems, environment monitoring, and local feedback can fully and deterministically protect any available quantum information, including entanglement initially... [Phys. Rev. A 81, 032310] Published Thu Mar 11, 2010 Universality in the equilibration of quantum systems after a small quench Author(s): Lorenzo Campos Venuti and Paolo Zanardi A sudden change in the Hamiltonian parameter drives a quantum system out of equilibrium. For a finite-size system, expectations of observables start fluctuating in time without converging to a precise limit. A new equilibrium state emerges only in the probabilistic sense, when the probability distri... [Phys. Rev. A 81, 032113] Published Thu Mar 11, 2010 Continuous quantum measurement of a light-matter system Author(s): R. Zhao, S. D. Jenkins, C. J. Campbell, D. N. Matsukevich, T. Chanelière, T. A. B. Kennedy, and A. Kuzmich Continuous measurements on correlated quantum systems, in addition to providing information on the state vector of the system in question, induce evolution in the unmeasured degrees of freedom conditioned on the measurement outcome. However, experimentally accessing these nontrivial regimes requires... [Phys. Rev. A 81, 031802] Published Thu Mar 11, 2010 Dynamics of two-site Fermi-Hubbard and Bose-Hubbard systems Author(s): K. Ziegler This paper analyzes dynamical properties of small Fermi-Hubbard and Bose-Hubbard systems, focusing on the structure of the underlying Hilbert space. We evaluate time-dependent quantities such as the return probability to the initial state and the spin imbalance of spin-1/2 fermions. For the symmetri... [Phys. Rev. A 81, 034701] Published Wed Mar 10, 2010 Ultrashort-pulse propagation through free-carrier plasmas Author(s): Jeremy R. Gulley and W. M. Dennis The past decade has seen frequent use of a modified nonlinear Schrödinger equation to describe ultrashort pulse propagation in materials where free-carrier plasmas are present. The optical contribution from the resulting free-current densities in this equation is often described using a classical D... [Phys. Rev. A 81, 033818] Published Wed Mar 10, 2010

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