Physical Review A

Physical Review A

Recent articles in Physical Review A
Interface tension of Bose-Einstein condensates Author(s): Bert Van Schaeybroeck Motivated by recent observations of phase-segregated binary Bose-Einstein condensates, we propose a method to calculate the excess energy due to the interface tension of a trapped configuration. By this method one should be able to numerically reproduce the experimental data by means of a simple Tho... [Phys. Rev. A 78, 023624] Published Wed Aug 20, 2008 Atom Fock-state preparation by trap reduction Author(s): A. del Campo and J. G. Muga We study the production of low-atom-number Fock states by sudden reduction of the potential trap in a one-dimensional strongly interacting (Tonks-Girardeau) gas. The fidelity of the Fock-state preparation is characterized by the average and variance of the number of trapped atoms. Two different meth... [Phys. Rev. A 78, 023412] Published Wed Aug 20, 2008 Electric quadrupole moments of metastable states of Ca^{+} , Sr^{+} , and Ba^{+} Author(s): Dansha Jiang, Bindiya Arora, and M. S. Safronova The electric quadrupole moments of the metastable nd_{3∕2} and nd_{5∕2} states of Ca^{+} , Sr^{+} , and Ba^{+} are calculated using the relativistic all-order method including all single, double, and partial triple excitations of the Dirac-Hartree-Fock wave function to provide recommended values... [Phys. Rev. A 78, 022514] Published Wed Aug 20, 2008 Analog Grover search by adiabatic passage in a cavity-laser-atom system Author(s): D. Daems and S. Guérin A physical implementation of the adiabatic Grover search is theoretically investigated in a system of N identical three-level atoms trapped in a single-mode cavity. Some of the atoms are marked through the presence of an energy gap between their two ground states. The search is controlled by two par... [Phys. Rev. A 78, 022330] Published Wed Aug 20, 2008 Three fermions with six single-particle states can be entangled in two inequivalent ways Author(s): Péter Lévay and Péter Vrana Using a generalization of Cayley’s hyperdeterminant as a new measure of tripartite fermionic entanglement we obtain the SLOCC classification of three-fermion systems with six “single-particle” states. A special subclass of such three-fermion systems is shown to have the same properties as the ... [Phys. Rev. A 78, 022329] Published Wed Aug 20, 2008 Optimal light storage with full pulse-shape control Author(s): Irina Novikova, Nathaniel B. Phillips, and Alexey V. Gorshkov We experimentally demonstrate optimal storage and retrieval of light pulses of arbitrary shape in atomic ensembles. By shaping auxiliary control pulses, we attain efficiencies approaching the fundamental limit and achieve precise retrieval into any predetermined temporal profile. Our techniques, dem... [Phys. Rev. A 78, 021802] Published Wed Aug 20, 2008 Experimental quantum key distribution based on a Bell test Author(s): Alexander Ling, Matthew P. Peloso, Ivan Marcikic, Valerio Scarani, Antía Lamas-Linares, and Christian Kurtsiefer We report on a complete free-space field implementation of a modified Ekert protocol for quantum key distribution using entangled photon pairs. For each photon pair we perform a random choice between key generation and a Bell inequality. The amount of violation is used to determine the possible know... [Phys. Rev. A 78, 020301] Published Wed Aug 20, 2008 Erratum: Vortex lattice stability and phase coherence in three-dimensional rapidly rotating Bose-Einstein condensates [Phys. Rev. A 70, 033602 (2004)] Author(s): S. Andrew Gifford and Gordon Baym [Phys. Rev. A 78, 029904] Published Tue Aug 19, 2008 Squeezed single-atom laser in a photonic crystal Author(s): Rong Tan, Gao-xiang Li, and Zbigniew Ficek We study nonclassical and spectral properties of a strongly driven single-atom laser engineered within a photonic crystal that facilitates a frequency-dependent reservoir. In these studies, we apply a dressed atom model approach to derive the master equation of the system and study the properties of... [Phys. Rev. A 78, 023833] Published Tue Aug 19, 2008 Back-action limit of linewidth in an optomechanical oscillator Author(s): Kerry J. Vahala Laser cooling and amplification of mechanical modes in an optical cavity are now possible with several device geometries. Quantum back action sets the fundamental limit to cooling. It has, however, not been considered in the regenerative oscillator, wherein mechanical amplification overcomes loss, l... [Phys. Rev. A 78, 023832] Published Tue Aug 19, 2008 Simulations and experiments on polarization squeezing in optical fiber Author(s): Joel F. Corney, Joel Heersink, Ruifang Dong, Vincent Josse, Peter D. Drummond, Gerd Leuchs, and Ulrik L. Andersen We investigate polarization squeezing of ultrashort pulses in optical fiber, over a wide range of input energies and fiber lengths. Comparisons are made between experimental data and quantum dynamical simulations to find good quantitative agreement. The numerical calculations, performed using both t... [Phys. Rev. A 78, 023831] Published Tue Aug 19, 2008 Dissipative soliton resonances Author(s): W. Chang, A. Ankiewicz, J. M. Soto-Crespo, and N. Akhmediev We have found a dissipative soliton resonance which applies to nonlinear dynamical systems governed by the complex cubic-quintic Ginzburg-Landau equation. Specifically, for particular values of the equation parameters, the soliton energy increases indefinitely. These equation parameters can easily b... [Phys. Rev. A 78, 023830] Published Tue Aug 19, 2008 Fundamental photophysics and optical loss processes in Si-nanocrystal-doped microdisk resonators Author(s): Rohan D. Kekatpure and Mark L. Brongersma We report a detailed analytical, numerical, and experimental study of microdisk resonators doped with nanometer sized silicon quantum dots (nanocrystals). An intuitive analytical ray-optics-based model is developed and used to capture the behavior of the quality factor (Q) as a function of the disk ... [Phys. Rev. A 78, 023829] Published Tue Aug 19, 2008 Transmission spectrum of Doppler-broadened two-level atoms in a cavity in the strong-coupling regime Author(s): J. Gea-Banacloche, Haibin Wu, and Min Xiao We present the theory of “normal mode splitting” (sometimes also called, in the low-intensity limit, “vacuum Rabi splitting”) for a Doppler-broadened two-level medium in an optical cavity, and illustrate it with experimental results. We note that, in the extreme Doppler limit, the absorptive... [Phys. Rev. A 78, 023828] Published Tue Aug 19, 2008 Breathing mode frequencies of a rotating Fermi gas in the BCS-BEC crossover region Author(s): Theja N. De Silva We study the breathing mode frequencies of a rotating Fermi gas trapped in a harmonic plus radial quartic potential. We find that as the radial anharmonicity increases, the lowest order radial mode frequency increases while the next lowest order radial mode frequency decreases. Then at a critical an... [Phys. Rev. A 78, 023623] Published Tue Aug 19, 2008 Recoil collisions as a portal to field-assisted ionization at near-uv frequencies in the strong-field double ionization of helium Author(s): A. Emmanouilidou We explore the dependence of the double ionization of the He atom on the frequency of a strong laser field while keeping the ponderomotive energy constant. As we increase the frequency we find that the remarkable “fingerlike” structure for high momenta recently found for ω=0.055a.u. persists fo... [Phys. Rev. A 78, 023411] Published Tue Aug 19, 2008 Nuclear kinetic energy spectra of D _{2} ^{+} in an intense laser field: Beyond the Born-Oppenheimer approximation Author(s): Mohsen Vafaee Simultaneously, the vibrational nuclear dynamics and full dimensional electronic dynamics of a deuterium molecular ion exposed to a linear polarized intense laser field are studied. The time-dependent Schrödinger equation of an aligned D _{2} ^{+} ion with electric laser field is solved for a simul... [Phys. Rev. A 78, 023410] Published Tue Aug 19, 2008 Efficient generation of random multipartite entangled states using time-optimal unitary operations Author(s): A. Borras, A. P. Majtey, and M. Casas We review the generation of random pure states using a protocol of repeated two-qubit gates. We study the dependence of the convergence to states with Haar multipartite entanglement distribution. We investigate the optimal generation of such states in terms of the physical (real) time needed to appl... [Phys. Rev. A 78, 022328] Published Tue Aug 19, 2008 Induced entanglement enhanced by quantum criticality Author(s): Qing Ai, Tao Shi, Guilu Long, and C. P. Sun Two-qubit entanglement can be induced by a quantum data bus interacting with them. In this paper, with the quantum spin chain in the transverse field as an illustration of the quantum data bus, we show that such induced entanglement can be enhanced by the quantum phase transition (QPT) of the quantu... [Phys. Rev. A 78, 022327] Published Tue Aug 19, 2008 Loss in hybrid qubit-bus couplings and gates Author(s): Sebastien G. Louis, W. J. Munro, T. P. Spiller, and Kae Nemoto We provide a characterization and analysis of the effects of dissipation on oscillator assisted (qubus) quantum gates. The effects can be understood and minimized by looking at the dynamics of the signal coherence and its entanglement with the continuous variable probe. Adding loss in between succes... [Phys. Rev. A 78, 022326] Published Tue Aug 19, 2008 Nonlocal density correlations as a signature of Hawking radiation from acoustic black holes Author(s): Roberto Balbinot, Alessandro Fabbri, Serena Fagnocchi, Alessio Recati, and Iacopo Carusotto We have used the analogy between gravitational systems and nonhomogeneous fluid flows to calculate the density-density correlation function of an atomic Bose-Einstein condensate in the presence of an acoustic black hole. The emission of correlated pairs of phonons by Hawking-like process results int... [Phys. Rev. A 78, 021603] Published Tue Aug 19, 2008 Anomalies in electrostatic calibrations for the measurement of the Casimir force in a sphere-plane geometry Author(s): W. J. Kim, M. Brown-Hayes, D. A. Dalvit, J. H. Brownell, and R. Onofrio We have performed precision electrostatic calibrations in the sphere-plane geometry and observed anomalous behavior. Namely, the scaling exponent of the electrostatic signal with distance was found to be smaller than expected on the basis of the pure Coulombian contribution and the residual potentia... [Phys. Rev. A 78, 020101] Published Tue Aug 19, 2008 Erratum: Photoassociation adiabatic passage of ultracold Rb atoms to form ultracold Rb_{2} molecules [Phys. Rev. A 75, 013405 (2007)] Author(s): Evgeny A. Shapiro, Moshe Shapiro, Avi Pe’er, and Jun Ye [Phys. Rev. A 78, 029903] Published Mon Aug 18, 2008 Erratum: Multislit interference patterns in high-order harmonic generation in C_{60} [Phys. Rev. A 76, 063406 (2007)] Author(s): M. F. Ciappina, A. Becker, and A. Jaroń-Becker [Phys. Rev. A 78, 029902] Published Mon Aug 18, 2008 High-efficiency photon-number-resolving multichannel detector Author(s): Michal Mičuda, Ondřej Haderka, and Miroslav Ježek A balanced eight-port photon-number-resolving detector is developed. The employed scheme is based on an optical-fiber time-multiplexed device with the unique total optical transmittance reaching 93% and a pair of avalanche photodiodes. The balanced operation is achieved even for imperfect unbalanced... [Phys. Rev. A 78, 025804] Published Mon Aug 18, 2008 Sound speed of a Bose-Einstein condensate in an optical lattice Author(s): Z. X. Liang (梁兆新), Xi Dong (董希), Z. D. Zhang (张志东), and Biao Wu (吴飙) The speed of sound of a Bose-Einstein condensate in an optical lattice is studied both analytically and numerically in all spatial three dimensions. Our investigation shows that the sound speed depends strongly on the strength of the lattice. In the one-dimensional case, the speed of sound falls mon... [Phys. Rev. A 78, 023622] Published Mon Aug 18, 2008 Single-photon core-valence double ionization of molecular oxygen Author(s): E. Andersson, M. Stenrup, J. H. Eland, L. Hedin, M. Berglund, L. Karlsson, Å. Larson, H. Ågren, J.-E. Rubensson, and R. Feifel Single-photon core-valence double ionization of molecular oxygen has been studied using a magnetic bottle time-of-flight electron coincidence spectrometer. The K^{−1} V^{−1} double ionization electron spectrum of O_{2} is reported and is assigned with the aid of ab initio calculations. A direct ... [Phys. Rev. A 78, 023409] Published Mon Aug 18, 2008 Monotonically convergent optimal control theory of quantum systems under a nonlinear interaction with the control field Author(s): M. Lapert, R. Tehini, G. Turinici, and D. Sugny We consider the optimal control of quantum systems interacting nonlinearly with an electromagnetic field. We propose monotonically convergent algorithms to solve the optimal equations. The monotonic behavior of the algorithm is ensured by a nonstandard choice of the cost, which is not quadratic in t... [Phys. Rev. A 78, 023408] Published Mon Aug 18, 2008 Perfect state transfer in long-range interacting spin chains Author(s): Giulia Gualdi, Vojtech Kostak, Irene Marzoli, and Paolo Tombesi We investigate the most general conditions under which a finite ferromagnetic long-range interacting spin chain achieves unitary fidelity and the shortest transfer time in transmitting an unknown input qubit. A deeper insight into system dynamics, allows us to identify an ideal system involving send... [Phys. Rev. A 78, 022325] Published Mon Aug 18, 2008 Nonthreshold anomalous time advance in multichannel scattering Author(s): Wytse van Dijk, Kyle Spyksma, and Matthew West We investigate scattering in a one-dimensional two-channel system using a model that is analytically tractable. We find anomalously large time advance over a small energy range of the transmission in the incident channel. This time advance for transmission occurs at energies above threshold of the s... [Phys. Rev. A 78, 022108] Published Mon Aug 18, 2008

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