Preview: Recent Articles in Phys. Rev. A
Recent Articles in Phys. Rev. ARecent articles in Physical Review APublished: 2012-02-09T21:06:18-05:00
Exploiting boundary states of imperfect spin chains for high-fidelity state transfer 2012-02-09T10:00:00-05:00 Author(s): M. Bruderer, K. Franke, S. Ragg, W. Belzig, and D. ObreschkowWe study transfer of a quantum state through XX spin chains with static imperfections. We combine the two standard approaches for state transfer based on (i) modulated couplings between neighboring spins throughout the spin chain and (ii) weak coupling of the outermost spins to an unmodulated spin c... [Phys. Rev. A 85, 022312] Published Thu Feb 09, 2012
High-signal-to-noise-ratio laser technique for accurate measurements of spectral line parameters 2012-02-09T10:00:00-05:00 Author(s): A. Cygan, D. Lisak, S. Wójtewicz, J. Domysławska, J. T. Hodges, R. S. Trawiński, and R. CiuryłoAn experiment enabling extremely high signal-to-noise ratios in the measurement of spectral line shapes is described. This approach, which combines high-bandwidth locking of a continuous wave probe laser and the frequency-stabilized cavity ring-down spectroscopy technique, enables long-term signal a... [Phys. Rev. A 85, 022508] Published Thu Feb 09, 2012
Universal dynamic structure factor of a strongly correlated Fermi gas 2012-02-09T10:00:00-05:00 Author(s): Hui Hu and Xia-Ji LiuUniversality of strongly interacting fermions is a topic of great interest in diverse fields. Here we investigate theoretically the universal dynamic density response of resonantly interacting ultracold Fermi atoms in the limit of either high temperature or large frequency. At high temperature, we u... [Phys. Rev. A 85, 023612] Published Thu Feb 09, 2012
Faraday waves in binary nonmiscible Bose-Einstein condensates 2012-02-09T10:00:00-05:00 Author(s): Antun Balaž and Alexandru I. NicolinWe show by extensive numerical simulations and analytical variational calculations that elongated binary nonmiscible Bose-Einstein condensates subject to periodic modulations of the radial confinement exhibit a Faraday instability similar to that seen in one-component condensates. Considering the hy... [Phys. Rev. A 85, 023613] Published Thu Feb 09, 2012
Proposal for isolated-attosecond-pulse generation in the multicycle regime through modulation of the carrier wave 2012-02-09T10:00:00-05:00 Author(s): Yang Xiang, Yueping Niu, and Shangqing GongAn intuitive physical mechanism for isolated-attosecond-pulse generation in a multicycle pulse regime is proposed. We suggest that the continuum spectra of the high-order harmonics can be controlled through the modulation of carrier wave, while keeping the multicycle envelope unchanged approximately... [Phys. Rev. A 85, 023808] Published Thu Feb 09, 2012
Quantum theory analysis of triple photons generated by a χ^{(3)} process 2012-02-09T10:00:00-05:00 Author(s): A. Dot, A. Borne, B. Boulanger, K. Bencheikh, and J. A. LevensonWe present a quantum theoretical analysis of triple photons generated by a phase-matched third-order nonlinear process in a KTP crystal in a weak-interaction regime. We show that the quantum properties of the triple photons can be brought to light through optical second- and third-order sum frequenc... [Phys. Rev. A 85, 023809] Published Thu Feb 09, 2012
Resonance-fluorescence-localization microscopy with subwavelength resolution 2012-02-09T10:00:00-05:00 Author(s): Zeyang Liao, M. Al-Amri, and M. Suhail ZubairyWe evaluate the resonance-fluorescence spectrum of a bunch of two-level atoms driven by a gradient coherent laser field. The result shows that we can determine the positions of atoms from the spectrum even when the atoms locate within the subwavelength range and the dipole-dipole interaction is sign... [Phys. Rev. A 85, 023810] Published Thu Feb 09, 2012
Monitoring stimulated emission at the single-photon level in one-dimensional atoms 2012-02-09T10:00:00-05:00 Author(s): D. Valente, S. Portolan, G. Nogues, J. P. Poizat, M. Richard, J. M. Gérard, M. F. Santos, and A. AuffèvesWe theoretically investigate signatures of stimulated emission at the single-photon level for a two-level atom interacting with a one-dimensional light field. We consider the transient regime where the atom is initially excited, and the steady-state regime where the atom is continuously driven with ... [Phys. Rev. A 85, 023811] Published Thu Feb 09, 2012
Erratum: Bell’s theorem with and without inequalities for the three-qubit Greenberger-Horne-Zeilinger and W states [Phys. Rev. A 65, 032108 (2002)] 2012-02-09T10:00:00-05:00 Author(s): Adán Cabello[Phys. Rev. A 85, 029903] Published Thu Feb 09, 2012
Correlations in optically controlled quantum emitters 2012-02-08T10:00:00-05:00 Author(s): Cristian E. Susa and John H. ReinaWe address the problem of optically controlling and quantifying the dissipative dynamics of quantum and classical correlations in a setup of individual quantum emitters under external laser excitation. We show that both types of correlations, the former measured by the quantum discord, are present i... [Phys. Rev. A 85, 022111] Published Wed Feb 08, 2012
Heisenberg uncertainty relation for position and momentum beyond central potentials 2012-02-08T10:00:00-05:00 Author(s): Łukasz RudnickiRecently, Sánchez-Moreno et al. [ New J. Phys. 8 330 (2006)] have shown that the three-dimensional Heisenberg uncertainty relation σrσp≥3ℏ/2 might be significantly sharpened if the relevant quantum state describes the particle in a central potential. I extend that result to the case of states which... [Phys. Rev. A 85, 022112] Published Wed Feb 08, 2012
Overcoming decoherence in the collapse and revival of spin Schrödinger-cat states 2012-02-08T10:00:00-05:00 Author(s): M. J. Everitt, W. J. Munro, and T. P. SpillerIn addition to being a very interesting quantum phenomenon, Schrödinger-cat-state swapping has the potential for application in the preparation of quantum states that could be used in metrology and other quantum processing. We study in detail the effects of field decoherence on a Schrödinger-cat-sta... [Phys. Rev. A 85, 022113] Published Wed Feb 08, 2012
Optimal nonlocal multipartite entanglement concentration based on projection measurements 2012-02-08T10:00:00-05:00 Author(s): Fu-Guo DengWe propose an optimal nonlocal entanglement concentration protocol (ECP) for multiphoton systems in a partially entangled pure state, resorting to the projection measurement on an additional photon. One party in quantum communication first performs a parity-check measurement on her photon in an N-ph... [Phys. Rev. A 85, 022311] Published Wed Feb 08, 2012
Coupled-cluster response theory for near-edge x-ray-absorption fine structure of atoms and molecules 2012-02-08T10:00:00-05:00 Author(s): Sonia Coriani, Ove Christiansen, Thomas Fransson, and Patrick NormanBased on an asymmetric Lanczos-chain subspace algorithm, damped coupled cluster linear response functions have been implemented for the hierarchy of coupled cluster (CC) models including CC with single excitations (CCS), CC2, CC with single and double excitations (CCSD), and CCSD with noniterative t... [Phys. Rev. A 85, 022507] Published Wed Feb 08, 2012
Resonant control of polar molecules in individual sites of an optical lattice 2012-02-08T10:00:00-05:00 Author(s): Thomas M. Hanna, Eite Tiesinga, William F. Mitchell, and Paul S. JulienneWe study the resonant control of two nonreactive polar molecules in an optical lattice site, focusing on the example of RbCs. Collisional control can be achieved by tuning bound states of the intermolecular dipolar potential by varying the applied electric field or trap frequency. We consider a wide... [Phys. Rev. A 85, 022703] Published Wed Feb 08, 2012
Few-body bound-state stability of dipolar molecules in two dimensions 2012-02-08T10:00:00-05:00 Author(s): A. G. Volosniev, D. V. Fedorov, A. S. Jensen, and N. T. ZinnerBound structures among dipolar molecules in multilayers are a topic of great interest in the light of recent experiments that have demonstrated the feasibility of the setup. While it is known that two molecules in two adjacent layers will always bind, larger complexes have only been scarcely address... [Phys. Rev. A 85, 023609] Published Wed Feb 08, 2012
Binding and structure of tetramers in the scaling limit 2012-02-08T10:00:00-05:00 Author(s): M. R. Hadizadeh, M. T. Yamashita, Lauro Tomio, A. Delfino, and T. FredericoThe momentum-space structure of the Faddeev-Yakubovsky (FY) components of weakly bound tetramers is investigated at the unitary limit using a renormalized zero-range two-body interaction. The results, obtained by considering a given trimer level with binding energy B3, provide further support to a u... [Phys. Rev. A 85, 023610] Published Wed Feb 08, 2012
Optimal control of quantum superpositions in a bosonic Josephson junction 2012-02-08T10:00:00-05:00 Author(s): M. Lapert, G. Ferrini, and D. SugnyWe show how to optimally control the creation of quantum superpositions in a bosonic Josephson junction within the two-site Bose-Hubbard-model framework. Both geometric and purely numerical optimal-control approaches are used, the former providing a generalization of the proposal of Micheli et al. [... [Phys. Rev. A 85, 023611] Published Wed Feb 08, 2012
Deducing radiation pressure on a submerged mirror from the Doppler shift 2012-02-08T10:00:00-05:00 Author(s): Masud MansuripurRadiation pressure on a flat mirror submerged in a transparent liquid depends not only on the refractive index n of the liquid but also on the phase angle ψ0 of the Fresnel reflection coefficient of the mirror, which could be anywhere between 0∘ and 180∘. Depending on the value of ψ0, the momentum p... [Phys. Rev. A 85, 023807] Published Wed Feb 08, 2012
Photoionization profiles of metal clusters and the Fowler formula 2012-02-08T10:00:00-05:00 Author(s): Abhinav Prem and Vitaly V. KresinMetal-cluster ionization potentials are important characteristics of these “artificial atoms,” but extracting these quantities from cluster photoabsorption spectra, especially in the presence of thermal smearing, remains a big challenge. Here we demonstrate that the classic Fowler theory of surface ... [Phys. Rev. A 85, 025201] Published Wed Feb 08, 2012
Fermi polarons in two dimensions 2012-02-07T10:00:00-05:00 Author(s): Richard Schmidt, Tilman Enss, Ville Pietilä, and Eugene DemlerWe theoretically analyze inverse radio-frequency (rf) spectroscopy experiments in two-component Fermi gases. We consider a small number of impurity atoms interacting strongly with a bath of majority atoms. In two-dimensional geometries we find that the main features of the rf spectrum correspond to ... (image) [Phys. Rev. A 85, 021602] Published Tue Feb 07, 2012
Local-channel-induced rise of quantum correlations in continuous-variable systems 2012-02-07T10:00:00-05:00 Author(s): Francesco Ciccarello and Vittorio GiovannettiIt was recently discovered that the quantum correlations of a pair of disentangled qubits, as measured by the quantum discord, can increase solely because of their interaction with a local dissipative bath. Here, we show that a similar phenomenon can occur in continuous-variable bipartite systems. W... [Phys. Rev. A 85, 022108] Published Tue Feb 07, 2012
NMR implementation of a quantum delayed-choice experiment 2012-02-07T10:00:00-05:00 Author(s): Soumya Singha Roy, Abhishek Shukla, and T. S. MaheshWe report an experimental demonstration of a quantum delayed-choice experiment via nuclear magnetic resonance techniques. Two spin-1/2 nuclei from each molecule of a liquid ensemble are used as target and ancilla qubits. The circuit corresponding to the recently proposed quantum delayed-choice setup... [Phys. Rev. A 85, 022109] Published Tue Feb 07, 2012
Interacting classical and quantum particles 2012-02-07T10:00:00-05:00 Author(s): Alvin J. K. Chua, Michael J. W. Hall, and C. M. SavageWe apply Hall and Reginatto's theory of interacting classical and quantum ensembles to harmonically coupled particles, with a view to understanding its experimental implications. This hybrid theory has no free parameters and makes distinctive predictions that should allow it to be experimentally dis... [Phys. Rev. A 85, 022110] Published Tue Feb 07, 2012
Frequency-modulated pulses for quantum bits coupled to time-dependent baths 2012-02-07T10:00:00-05:00 Author(s): Benedikt Fauseweh, Stefano Pasini, and Götz S. UhrigWe consider the coherent control of a quantum bit by the use of short pulses with finite duration τp. By shaping the pulse, we perturbatively decouple the dynamics of the bath from the dynamics of the quantum bit during the pulse. Such shaped pulses provide single quantum bit gates robust against de... [Phys. Rev. A 85, 022310] Published Tue Feb 07, 2012
Numerical solution of the time-independent Dirac equation for diatomic molecules: B splines without spurious states 2012-02-07T10:00:00-05:00 Author(s): François Fillion-Gourdeau, Emmanuel Lorin, and André D. BandraukTwo numerical methods are used to evaluate the relativistic spectrum of the two-center Coulomb problem (for the H2+ and Th2179+ diatomic molecules) in the fixed nuclei approximation by solving the single-particle time-independent Dirac equation. The first one is based on a min-max principle and uses... [Phys. Rev. A 85, 022506] Published Tue Feb 07, 2012
Two-body Coulomb scattering and complex scaling 2012-02-07T10:00:00-05:00 Author(s): I. Hornyak and A. T. KruppaThe two-body Coulomb scattering problem is solved using the standard complex-scaling method. The explicit enforcement of the scattering boundary condition is avoided. Splitting of the scattering wave function based on the Coulomb modified plane wave is considered. This decomposition leads to a three... [Phys. Rev. A 85, 022702] Published Tue Feb 07, 2012
Number-phase Wigner representation for scalable stochastic simulations of controlled quantum systems 2012-02-07T10:00:00-05:00 Author(s): M. R. Hush, A. R. R. Carvalho, and J. J. HopeSimulation of conditional master equations is important to describe systems under continuous measurement and for the design of control strategies in quantum systems. For large bosonic systems, such as Bose-Einstein condensates and atom lasers, full quantum-field simulations must rely on scalable sto... [Phys. Rev. A 85, 023607] Published Tue Feb 07, 2012
Polariton condensation with nonlinear photons 2012-02-07T10:00:00-05:00 Author(s): Xiaoyong Guo, Zhongzhou Ren, and Zimeng ChiIn this paper we propose a model of polariton condensation with Kerr-type nonlinear photons. We introduce a generalized Dicke Hamiltonian to describe our system. By constructing the partition function as a path integral, the analytical and numerical solutions are presented. On the mean-field level, ... [Phys. Rev. A 85, 023608] Published Tue Feb 07, 2012
Back-reaction effects of quantum vacuum in cavity quantum electrodynamics 2012-02-07T10:00:00-05:00 Author(s): I. Carusotto, S. De Liberato, D. Gerace, and C. CiutiWe theoretically study an optical system in which the back-reaction of quantum vacuum manifests itself as a sizable suppression of the absorption by a three-level emitter embedded in an optical cavity. A theoretical model including the anti-rotating-wave terms of the light-matter interaction Hamilto... [Phys. Rev. A 85, 023805] Published Tue Feb 07, 2012 |
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