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Phase-matching mechanism for high-photon-energy harmonics of a long trajectory driven by a midinfrared laser (2012)

Cheng Gong, Jiaming Jiang, Chuang Li, Liwei Song, Zhinan Zeng, Jing Miao, Xiaochun Ge, Yinghui Zheng, Ruxin Li, and Zhizhan Xu

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-09

Description: Author(s): Cheng Gong, Jiaming Jiang, Chuang Li, Liwei Song, Zhinan Zeng, Jing Miao, Xiaochun Ge, Yinghui Zheng, Ruxin Li, and Zhizhan Xu High-order harmonics were generated with neon gas by using 12-fs midinfrared laser pulses with stabilized carrier-envelope phase (CEP). At some specific CEP, a broad “supercontinuum” of the extreme ultraviolet spectrum can be obtained. Two distinct continuous spectral regimes are found by numerical ... [Phys. Rev. A 85, 033410] Published Thu Mar 08, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Effects of photon momentum in nonrelativistic (γ,2e) processes (2012)

A. G. Galstyan, O. Chuluunbaatar, Yu. V. Popov, and B. Piraux

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-22

Description: Author(s): A. G. Galstyan, O. Chuluunbaatar, Yu. V. Popov, and B. Piraux We study the effects of nonzero photon momentum on the triply differential cross section (TDCS) for ( γ ,2 e ) processes. Due to the low value of the photon momentum, these effects are weak and manifest only in special kinematical conditions such as the back-to-back emission of the electrons with equal ... [Phys. Rev. A 85, 023418] Published Tue Feb 21, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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State-selective electron transfer and ionization in collisions of highly charged ions with ground-state Na(3s) and laser-excited Na^{*}(3p) (2012)

I. Blank, S. Otranto, C. Meinema, R. E. Olson, and R. Hoekstra

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-22

Description: Author(s): I. Blank, S. Otranto, C. Meinema, R. E. Olson, and R. Hoekstra Single electron transfer and ionization in collisions of N 5+ and Ne 8+ with ground state Na( 3 s ) and laser excited Na * ( 3 p ) are investigated both experimentally and theoretically at collision energies from 1 to 10 keV/amu, which includes the classical orbital velocity of the valence electron. State-sel... [Phys. Rev. A 85, 022712] Published Tue Feb 21, 2012

Keywords: Atomic and molecular collisions and interactions

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Evaporation-limited loading of an atomic trap (2012)

Markus Falkenau, Valentin V. Volchkov, Jahn Rührig, Hannes Gorniaczyk, and Axel Griesmaier

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-22

Description: Author(s): Markus Falkenau, Valentin V. Volchkov, Jahn Rührig, Hannes Gorniaczyk, and Axel Griesmaier Recently, we have experimentally demonstrated a continuous loading mechanism for an optical dipole trap from a guided atomic beam [ M. Falkenau, V. V. Volchkov, J. Rührig, A. Griesmaier and T. Pfau Phys. Rev. Lett. 106 163002 (2011) ]. The observed evolution of the number of atoms and temperature in... [Phys. Rev. A 85, 023412] Published Tue Feb 21, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Dynamics of D_{3}^{+} slow dissociation induced by intense ultrashort laser pulses (2012)

B. Gaire, J. McKenna, M. Zohrabi, K. D. Carnes, B. D. Esry, and I. Ben-Itzhak

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-22

Description: Author(s): B. Gaire, J. McKenna, M. Zohrabi, K. D. Carnes, B. D. Esry, and I. Ben-Itzhak The dissociation of D 3 + in intense ultrashort laser pulses is investigated using an improved coincidence three-dimensional momentum imaging method that allows clear separation of all fragmentation channels and the determination of the kinetic energy release down to zero. Our results, using 10-fs, 79... [Phys. Rev. A 85, 023419] Published Tue Feb 21, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Low-density molecular gas of tightly bound Rashba-Dresselhaus fermions (2012)

So Takei, Chien-Hung Lin, Brandon M. Anderson, and Victor Galitski

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-22

Description: Author(s): So Takei, Chien-Hung Lin, Brandon M. Anderson, and Victor Galitski We study interacting Rashba-Dresselhaus fermions in two spatial dimensions. First, we present an exact solution to the two-particle bound-state problem of spin-orbit (SO)-coupled fermions for arbitrary Rashba and Dresselhaus SO interactions. An exact molecular-wave function and the Green's function ... [Phys. Rev. A 85, 023626] Published Tue Feb 21, 2012

Keywords: Matter waves and collective properties of cold atoms and molecules

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Stabilization of one-dimensional solitons against the critical collapse by quintic nonlinear lattices (2012)

Jianhua Zeng and Boris A. Malomed

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-22

Description: Author(s): Jianhua Zeng and Boris A. Malomed It has recently been discovered that stabilization of two-dimensional (2D) solitons against the critical collapse in media with cubic nonlinearity by means of nonlinear lattices (NLs) is a challenging problem. We address the one-dimensional (1D) version of the problem, i.e., the nonlinear-Schrödinge... [Phys. Rev. A 85, 023824] Published Tue Feb 21, 2012

Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics

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Dynamic quantum Kerr effect in circuit quantum electrodynamics (2012)

Yi Yin, H. Wang, M. Mariantoni, Radoslaw C. Bialczak, R. Barends, Y. Chen, M. Lenander, Erik Lucero, M. Neeley, A. D. O'Connell, D. Sank, M. Weides, J. Wenner, T. Yamamoto, J. Zhao, A. N. Cleland, and John M. Martinis

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-22

Description: Author(s): Yi Yin, H. Wang, M. Mariantoni, Radoslaw C. Bialczak, R. Barends, Y. Chen, M. Lenander, Erik Lucero, M. Neeley, A. D. O'Connell, D. Sank, M. Weides, J. Wenner, T. Yamamoto, J. Zhao, A. N. Cleland, and John M. Martinis A superconducting qubit coupled to a microwave resonator provides a controllable system that enables fundamental studies of light-matter interactions. In the dispersive regime, photons in the resonator exhibit induced frequency and phase shifts which are revealed in the resonator transmission spectr... [Phys. Rev. A 85, 023826] Published Tue Feb 21, 2012

Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics

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Slow-light dispersion properties of multiatomic multiband coupled-resonator optical waveguides (2012)

Sunkyu Yu, Xianji Piao, and Namkyoo Park

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-22

Description: Author(s): Sunkyu Yu, Xianji Piao, and Namkyoo Park In this paper, we investigate the dispersion properties of a multiatomic coupled-resonator optical waveguide (CROW), and show the existence of band-dependent group velocities in its slow-light bands. By including the next-nearest-neighbor coupling terms in a coupled-mode theory (CMT) analysis for th... [Phys. Rev. A 85, 023823] Published Tue Feb 21, 2012

Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics

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Theoretical study of angular-resolved two-photon ionization of H_{2} (2012)

Ph. V. Demekhin, B. M. Lagutin, and I. D. Petrov

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-22

Description: Author(s): Ph. V. Demekhin, B. M. Lagutin, and I. D. Petrov Cross sections and angular distribution parameters of electrons ejected via two-photon ionization of the hydrogen molecule by linearly and circularly polarized light are computed in the exciting-photon energy range of 8–14 eV, which covers the first four optical resonant states of the molecule. Phot... [Phys. Rev. A 85, 023416] Published Tue Feb 21, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Experimental and theoretical studies of two-color-pump resonance-induced enhancement of odd and even harmonics from a tin plasma (2012)

R. A. Ganeev, V. V. Strelkov, C. Hutchison, A. Zaïr, D. Kilbane, M. A. Khokhlova, and J. P. Marangos

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-25

Description: Author(s): R. A. Ganeev, V. V. Strelkov, C. Hutchison, A. Zaïr, D. Kilbane, M. A. Khokhlova, and J. P. Marangos We study high-order harmonic generation from a laser-produced tin plasma using 780 and 390 nm, 40 fs, 1 kHz pulses. Varying the chirp of the laser radiation, we observe variation of the harmonic frequency and intensity. The enhanced 16th and 17th harmonics are attributed to the influence of the stro... [Phys. Rev. A 85, 023832] Published Fri Feb 24, 2012

Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics

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Quantum-state transmission in a cavity array via two-photon exchange (2012)

Yu-Li Dong, Shi-Qun Zhu, and Wen-Long You

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-25

Description: Author(s): Yu-Li Dong, Shi-Qun Zhu, and Wen-Long You The dynamical behavior of a coupled cavity array is investigated when each cavity contains a three-level atom. For the uniform and staggered intercavity hopping, the whole system Hamiltonian can be analytically diagonalized in the subspace of single-atom excitation. The quantum-state transfer along ... [Phys. Rev. A 85, 023833] Published Fri Feb 24, 2012

Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics

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Phase transitions in dipolar gases in optical lattices (2012)

Y. Sherkunov, Vadim V. Cheianov, and Vladimir Fal'ko

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-25

Description: Author(s): Y. Sherkunov, Vadim V. Cheianov, and Vladimir Fal'ko We investigate the phase diagrams of two-dimensional lattice dipole systems with variable geometry. For bipartite square and triangular lattices with tunable vertical sublattice separation, we find rich phase diagrams featuring a sequence of easy-plane magnetically ordered phases separated by incomm... [Phys. Rev. A 85, 025603] Published Fri Feb 24, 2012

Keywords: Matter waves and collective properties of cold atoms and molecules

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Collective population evolution of two-level atoms based on mean-field theory (2012)

Hiroyuki Takeda

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-25

Description: Author(s): Hiroyuki Takeda I theoretically demonstrate the collective population evolution of two-level atoms, based on the mean-field theory. Optical materials with abrupt changes of electromagnetic local densities of states enable steady-state population inversion of two-level atoms which is generally considered impossible.... [Phys. Rev. A 85, 023837] Published Fri Feb 24, 2012

Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics

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Optimized maximum-confidence discrimination of N mixed quantum states and application to symmetric states (2012)

Ulrike Herzog

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-13

Description: Author(s): Ulrike Herzog We study an optimized measurement which discriminates N mixed quantum states occurring with given prior probabilities. The measurement yields the maximum achievable confidence for each of the N conclusive outcomes, thereby keeping the overall probability of inconclusive outcomes as small as possible... [Phys. Rev. A 85, 032312] Published Mon Mar 12, 2012

Keywords: Quantum information

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Functional relations for the density-functional exchange and correlation functionals connecting functionals at three densities (2012)

Daniel P. Joubert

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-13

Description: Author(s): Daniel P. Joubert It is shown that the density-functional-theory exchange and correlation functionals satisfy 0= γ E h x [ ρ N ]+2 E c γ [ ρ N ]− γ E h x [ ρ N −1 γ ]−2 E c γ [ ρ N −1 γ ]+ 2∫ d 3 r ′ [ ρ N −1 0 ( r )− ρ N −1 γ ( r )] v 0 ([ ρ N ]; r )+ ∫ d 3 r ′ [ ρ N −1 0 ( r )− ρ N −1 γ ( r )] r · ∇ v 0 ([ ρ N ]; r )+∫ d 3 r ′ ρ N ( r ) r · ∇ v c γ ([ ρ N ]; r ) − ∫ d 3 r ′ ρ N −1 γ ( r ) r · ∇ v c γ ([ ρ N −1 γ ]; r ) − ∫ d 3 r ′ f γ ( r ) r · ∇ v h x c γ ([ ρ N ]; r ... [Phys. Rev. A 85, 032511] Published Mon Mar 12, 2012

Keywords: Atomic and molecular structure and dynamics

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Possibility of magic trapping of a three-level system for Rydberg blockade implementation (2012)

Muir J. Morrison and Andrei Derevianko

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-13

Description: Author(s): Muir J. Morrison and Andrei Derevianko The Rydberg blockade mechanism has shown noteworthy promise for scalable quantum computation with neutral atoms. Both qubit states and gate-mediating Rydberg state belong to the same optically trapped atom. The trapping fields, while being essential, induce detrimental decoherence. Here we theoretic... [Phys. Rev. A 85, 033414] Published Mon Mar 12, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Experimental isotope shifts in Stark recurrence spectra of Rydberg D_{2} and H_{2} molecules (2012)

J. Haestad, A. Murphy, J. D. Wright, and T. J. Morgan

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-13

Description: Author(s): J. Haestad, A. Murphy, J. D. Wright, and T. J. Morgan D 2 and H 2 Stark recurrence spectra have been measured at scaled energies of ε =−2.3 and ε =−3.2 . An isotope shift in the scaled-action locations of recurrence peaks is found and explained by the increased density of states associated with perturbing rotational series. This reinforces the insight gaine... [Phys. Rev. A 85, 034502] Published Mon Mar 12, 2012

Keywords: Atomic and molecular structure and dynamics

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Kramers-Kronig relations and high-order nonlinear susceptibilities (2012)

Carsten Brée, Ayhan Demircan, and Günter Steinmeyer

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-13

Description: Author(s): Carsten Brée, Ayhan Demircan, and Günter Steinmeyer As previous theoretical results recently revealed, a Kramers-Kronig transform of multiphoton absorption rates allows for a precise prediction on the dispersion of the nonlinear refractive index n 2 in the near infrared. It was shown that this method allows reproduction of recent experimental results ... [Phys. Rev. A 85, 033806] Published Mon Mar 12, 2012

Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics

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Ferromagnetic transition of a two-component Fermi gas of hard spheres (2012)

F. Arias de Saavedra, F. Mazzanti, J. Boronat, and A. Polls

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-13

Description: Author(s): F. Arias de Saavedra, F. Mazzanti, J. Boronat, and A. Polls We use microscopic many-body theory to analyze the problem of itinerant ferromagnetism in a repulsive atomic Fermi gas of hard spheres. Using simple arguments we show that the available theoretical predictions for the onset of the ferromagnetic transition predict a transition point at a density ( k F a ... [Phys. Rev. A 85, 033615] Published Mon Mar 12, 2012

Keywords: Matter waves and collective properties of cold atoms and molecules

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Quantum key distribution with delayed privacy amplification and its application to the security proof of a two-way deterministic protocol (2012)

Chi-Hang Fred Fung, Xiongfeng Ma, H. F. Chau, and Qing-yu Cai

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-10

Description: Author(s): Chi-Hang Fred Fung, Xiongfeng Ma, H. F. Chau, and Qing-yu Cai Privacy amplification (PA) is an essential postprocessing step in quantum key distribution (QKD) for removing any information an eavesdropper may have on the final secret key. In this paper, we consider delaying PA of the final key after its use in one-time pad encryption and prove its security. We ... [Phys. Rev. A 85, 032308] Published Fri Mar 09, 2012

Keywords: Quantum information

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Comment on “Near-threshold behavior of electron-impact excitation of He^{+}(2s) and He^{+}(2p)” (2012)

K. M. Dunseath and M. Terao-Dunseath

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-10

Description: Author(s): K. M. Dunseath and M. Terao-Dunseath Xu and Shakeshaft [ Phys. Rev. A 84 024701 (2011) ] presented theoretical cross sections for excitation of the 2 s and 2 p states of He + at low collision energies, pointing out in particular the presence of cusps at the excitation threshold. We update their discussion of the comparison between theory ... [Phys. Rev. A 85, 036701] Published Fri Mar 09, 2012

Keywords: Atomic and molecular collisions and interactions

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Solution of the time-dependent Dirac equation for multiphoton ionization of highly charged hydrogenlike ions (2012)

Yulian V. Vanne and Alejandro Saenz

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-10

Description: Author(s): Yulian V. Vanne and Alejandro Saenz A theoretical study of the intense-field multiphoton ionization of hydrogenlike systems is performed by solving the time-dependent Dirac equation within the dipole approximation. It is shown that the velocity-gauge results agree to the ones in the length gauge only if the negative-energy states are ... [Phys. Rev. A 85, 033411] Published Fri Mar 09, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Quantum repeaters based on heralded qubit amplifiers (2012)

Jiří Minář, Hugues de Riedmatten, and Nicolas Sangouard

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-14

Description: Author(s): Jiří Minář, Hugues de Riedmatten, and Nicolas Sangouard We present a quantum repeater scheme based on the recently proposed qubit amplifier [ N. Gisin, S. Pironio and N. Sangouard Phys. Rev. Lett. 105 070501 (2010) ]. It relies on an on-demand entangled-photon-pair source which uses on-demand single-photon sources, linear optical elements, and atomic ens... [Phys. Rev. A 85, 032313] Published Tue Mar 13, 2012

Keywords: Quantum information

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Analytic theory of high-order-harmonic generation by an intense few-cycle laser pulse (2012)

M. V. Frolov, N. L. Manakov, A. M. Popov, O. V. Tikhonova, E. A. Volkova, A. A. Silaev, N. V. Vvedenskii, and Anthony F. Starace

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-14

Description: Author(s): M. V. Frolov, N. L. Manakov, A. M. Popov, O. V. Tikhonova, E. A. Volkova, A. A. Silaev, N. V. Vvedenskii, and Anthony F. Starace We present a theoretical model for describing the interaction of an electron, weakly bound in a short-range potential, with an intense, few-cycle laser pulse. General definitions for the differential probability of above-threshold ionization and for the yield of high-order-harmonic generation (HHG) ... [Phys. Rev. A 85, 033416] Published Tue Mar 13, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Experimental studies of partial photodetachment cross sections in K^{−} below the K(7 ^{2}P) threshold (2012)

A. O. Lindahl, J. Rohlén, H. Hultgren, I. Yu. Kiyan, D. J. Pegg, C. W. Walter, and D. Hanstorp

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-14

Description: Author(s): A. O. Lindahl, J. Rohlén, H. Hultgren, I. Yu. Kiyan, D. J. Pegg, C. W. Walter, and D. Hanstorp A collinear beams apparatus has been used to determine photodetachment cross sections for K − in the photon energy range 4.250–4.360 eV. State-selective detection, utilizing a resonance ionization scheme, was applied to measure partial cross sections for those channels which leave the residual K atom... [Phys. Rev. A 85, 033415] Published Tue Mar 13, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Disorder effects on the quantum coherence of a many-boson system (2012)

Zhi-Hai Zhang, Pei Lu, Shiping Feng, and Shi-Jie Yang

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-14

Description: Author(s): Zhi-Hai Zhang, Pei Lu, Shiping Feng, and Shi-Jie Yang The effects of disorder on the quantum coherence for many-boson systems are studied in a double-well model. For the ground state, the disorder enhances the quantum coherence. In the deep Mott regime, dynamical evolution reveals periodical collapses and revivals of the quantum coherence, which is rob... [Phys. Rev. A 85, 033617] Published Tue Mar 13, 2012

Keywords: Matter waves and collective properties of cold atoms and molecules

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Anderson localization of light at the interface between linear and nonlinear dielectric media with an optically induced photonic lattice (2012)

Dragana M. Jović, Milivoj R. Belić, and Cornelia Denz

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-13

Description: Author(s): Dragana M. Jović, Milivoj R. Belić, and Cornelia Denz In a numerical study, we observe Anderson localization of surface modes at the interface between a linear and a nonlinear dielectric medium, containing an optically induced disordered photonic lattice. We discover the threshold for the existence of such localized modes. The influence of Kerr nonline... [Phys. Rev. A 85, 031801] Published Mon Mar 12, 2012

Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics

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29

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Topological phases and multiqubit entanglement (2012)

Markus Johansson, Marie Ericsson, Kuldip Singh, Erik Sjöqvist, and Mark S. Williamson

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-13

Description: Author(s): Markus Johansson, Marie Ericsson, Kuldip Singh, Erik Sjöqvist, and Mark S. Williamson Global phase factors of topological origin, resulting from cyclic local SU evolution, called topological phases, were first described in [ Phys. Rev. Lett. 90 230403 (2003) ], in the case of entangled qubit pairs. In this paper we investigate topological phases in multiqubit systems as the result of... [Phys. Rev. A 85, 032112] Published Mon Mar 12, 2012

Keywords: Fundamental concepts

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30

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Multipartite information causality (2012)

Li-Yi Hsu

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-13

Description: Author(s): Li-Yi Hsu As a physical principle, information causality has thus far only been studied by using bipartite protocols. In this paper, we consider information causality in multireceiver random access codes, in which no receiver can gain any information only from classical communication. To precisely distinguish... [Phys. Rev. A 85, 032115] Published Mon Mar 12, 2012

Keywords: Fundamental concepts

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31

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Phase transitions for random states and a semicircle law for the partial transpose (2012)

Guillaume Aubrun, Stanisław J. Szarek, and Deping Ye

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-13

Description: Author(s): Guillaume Aubrun, Stanisław J. Szarek, and Deping Ye For a system of N identical particles in a random pure state, there is a threshold k 0 = k 0 ( N )∼ N /5 such that two subsystems of k particles each typically share entanglement if k 〉 k 0 , and typically do not share entanglement if k 〈 k 0 . By “random” we mean here uniformly distributed on the sphere of th... [Phys. Rev. A 85, 030302] Published Mon Mar 12, 2012

Keywords: Quantum information

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32

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Universality and robustness of revivals in the transverse field XY model (2012)

Juho Häppölä, Gábor B. Halász, and Alioscia Hamma

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-13

Description: Author(s): Juho Häppölä, Gábor B. Halász, and Alioscia Hamma We study the structure of the revivals in an integrable quantum many-body system, the transverse field X Y spin chain, after a quantum quench. The time evolutions of the Loschmidt echo, the magnetization, and the single-spin entanglement entropy are calculated. We find that the revival times for all ... [Phys. Rev. A 85, 032114] Published Mon Mar 12, 2012

Keywords: Fundamental concepts

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33

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Barycentric measure of quantum entanglement (2012)

Wojciech Ganczarek, Marek Kuś, and Karol Życzkowski

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-15

Description: Author(s): Wojciech Ganczarek, Marek Kuś, and Karol Życzkowski Majorana representation of quantum states by a constellation of n “stars” (points on the sphere) can be used to describe any pure state of a simple system of dimension n +1 or a permutation symmetric pure state of a composite system consisting of n qubits. We analyze the variance of the distribution ... [Phys. Rev. A 85, 032314] Published Wed Mar 14, 2012

Keywords: Quantum information

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34

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Completeness of classical φ^{4} theory on two-dimensional lattices (2012)

Vahid Karimipour and Mohammad Hossein Zarei

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-15

Description: Author(s): Vahid Karimipour and Mohammad Hossein Zarei We formulate a quantum formalism for the statistical mechanical models of discretized field theories on lattices and then show that the discrete version of φ 4 theory on 2D square lattice is complete in the sense that the partition function of any other discretized scalar field theory on an arbitrary... [Phys. Rev. A 85, 032316] Published Wed Mar 14, 2012

Keywords: Quantum information

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Retrieval of multiple spin waves from a weakly excited, metastable atomic ensemble (2012)

F. Bariani and T. A. B. Kennedy

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-15

Description: Author(s): F. Bariani and T. A. B. Kennedy The emission of light from a multiply excited atomic ensemble is examined and it is shown how symmetric (spin-wave) and nonsymmetric states of excitation radiate into spatially separate field modes. This observation has potential application to single-photon generation and spin-wave entanglement, si... [Phys. Rev. A 85, 033811] Published Wed Mar 14, 2012

Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics

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36

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Algorithmic approach to simulate Hamiltonian dynamics and an NMR simulation of quantum state transfer (2012)

Ashok Ajoy, Rama Koteswara Rao, Anil Kumar, and Pranaw Rungta

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-15

Description: Author(s): Ashok Ajoy, Rama Koteswara Rao, Anil Kumar, and Pranaw Rungta We propose an iterative algorithm to simulate the dynamics generated by any n -qubit Hamiltonian. The simulation entails decomposing the unitary time evolution operator U (unitary) into a product of different time-step unitaries. The algorithm product-decomposes U in a chosen operator basis by identi... [Phys. Rev. A 85, 030303] Published Wed Mar 14, 2012

Keywords: Quantum information

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37

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Thermally generated long-lived quantum correlations for two atoms trapped in fiber-coupled cavities (2012)

Vitalie Eremeev, Víctor Montenegro, and Miguel Orszag

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-15

Description: Author(s): Vitalie Eremeev, Víctor Montenegro, and Miguel Orszag A theoretical model for driving a two-qubit system to a stable long-lived entanglement is discussed. The entire system is represented by two atoms, initially in ground states and disentangled, each one coupled to a separate cavity with the cavities connected by a fiber. The cavities and fiber exchan... [Phys. Rev. A 85, 032315] Published Wed Mar 14, 2012

Keywords: Quantum information

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38

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Dipolar Bose-Einstein condensates with large scattering length (2012)

Luis E. Young-S, S. K. Adhikari, and P. Muruganandam

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-15

Description: Author(s): Luis E. Young-S, S. K. Adhikari, and P. Muruganandam A uniform dilute Bose gas of known density has a universal behavior as the atomic scattering length tends to infinity at unitarity while most of its properties are determined by a universal parameter ξ relating the energies of the noninteracting and unitary gases. The usual mean-field equation is no... [Phys. Rev. A 85, 033619] Published Wed Mar 14, 2012

Keywords: Matter waves and collective properties of cold atoms and molecules

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39

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Prediction of Feshbach resonances using an analytical quantum-defect matrix (2012)

Gao-Ren Wang (王高仁), Ting Xie (谢廷), Wei Zhang (张为), Yin Huang (黄寅), and Shu-Lin Cong (丛书林)

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-15

Description: Author(s): Gao-Ren Wang (王高仁), Ting Xie (谢廷), Wei Zhang (张为), Yin Huang (黄寅), and Shu-Lin Cong (丛书林) We present a theoretical model for describing ultracold atomic collision based on the multichannel quantum-defect theory. An analytical expression for the quantum-defect matrix Y is derived for the truncated 1/ R 6 model potential, and threshold behaviors of the quantum-defect parameters are discussed... [Phys. Rev. A 85, 032706] Published Wed Mar 14, 2012

Keywords: Atomic and molecular collisions and interactions

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40

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Intrapulse quantum spectral correlation of femtosecond optical pulses in optical fiber (2012)

Heongkyu Ju

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-15

Description: Author(s): Heongkyu Ju Intrapulse quantum spectral correlation of photon numbers of a femtosecond optical pulse, which propagates a 5-m-long optical fiber, is presented in a matrix format for quantum noise study by numerical calculation. The calculation includes the higher-order optical effects such as intrapulse-stimulat... [Phys. Rev. A 85, 033810] Published Wed Mar 14, 2012

Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics

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41

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Erratum: Coherent adiabatic transport of atoms in radio-frequency traps [Phys. Rev. A 83, 053620 (2011)] (2012)

T. Morgan, B. O'Sullivan, and Th. Busch

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-15

Description: Author(s): T. Morgan, B. O'Sullivan, and Th. Busch [Phys. Rev. A 85, 039904] Published Wed Mar 14, 2012

Keywords: Errata

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42

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Nonperturbative treatment of electron-impact ionization of Ar(3p) (2012)

Oleg Zatsarinny and Klaus Bartschat

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-16

Description: Author(s): Oleg Zatsarinny and Klaus Bartschat We present triple-differential cross sections for electron-impact ionization of a 3 p electron in Ar. Results from a fully nonperturbative close-coupling formalism using our B -spline R -matrix approach are compared with those from a hybrid distorted-wave plus R -matrix (close-coupling) expansion as wel... [Phys. Rev. A 85, 032708] Published Thu Mar 15, 2012

Keywords: Atomic and molecular collisions and interactions

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43

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Mapping the Berry curvature from semiclassical dynamics in optical lattices (2012)

H. M. Price and N. R. Cooper

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-16

Description: Author(s): H. M. Price and N. R. Cooper We propose a general method by which experiments on ultracold gases can be used to determine the topological properties of the energy bands of optical lattices, as represented by the map of the Berry curvature across the Brillouin zone. The Berry curvature modifies the semiclassical dynamics and hen... [Phys. Rev. A 85, 033620] Published Thu Mar 15, 2012

Keywords: Matter waves and collective properties of cold atoms and molecules

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44

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Low-rank positive-partial-transpose states and their relation to product vectors (2012)

Leif Ove Hansen, Andreas Hauge, Jan Myrheim, and Per Øyvind Sollid

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-07

Description: Author(s): Leif Ove Hansen, Andreas Hauge, Jan Myrheim, and Per Øyvind Sollid Deciding whether a mixed quantum state is separable or entangled is a difficult problem in general. Separable states are positive under partial transposition [they are positive-partial-transpose (PPT) states], but this simple test does not exclude all entangled states. In order to understand the ent... [Phys. Rev. A 85, 022309] Published Mon Feb 06, 2012

Keywords: Quantum information

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45

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Topological angular momentum in electron exchange excitation of a single atom (2012)

J. F. Williams, L. Pravica, and S. N. Samarin

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-07

Description: Author(s): J. F. Williams, L. Pravica, and S. N. Samarin In a single free two-valence-electron atom, the motion of the electron spin is a consequence of quantum statistics and the Pauli exclusion principle. Subsequently, during an electron impact exchange excitation from a 1 S 0 M S =0 to a 3 S 1 M S =0 state, the electron spin is “parallel transported” around a ... [Phys. Rev. A 85, 022701] Published Mon Feb 06, 2012

Keywords: Atomic and molecular collisions and interactions

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46

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Dissipation-induced squeezing (2012)

Gentaro Watanabe and Harri Mäkelä

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-07

Description: Author(s): Gentaro Watanabe and Harri Mäkelä We present a method for phase and number squeezing in two-mode Bose systems using dissipation. The effectiveness of this method is demonstrated by considering cold Bose gases trapped in a double-well potential. The extension of our formalism to an optical lattice gives control of the phase boundarie... [Phys. Rev. A 85, 023604] Published Mon Feb 06, 2012

Keywords: Matter waves and collective properties of cold atoms and molecules

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47

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Electric-quadrupole transition of H_{2} determined to 10^{−9} precision (2012)

C.-F. Cheng (程存峰), Y. R. Sun (孙羽), H. Pan (潘虎), J. Wang (王进), A.-W. Liu (刘安雯), A. Campargue, and S.-M. Hu (胡水明)

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-07

Description: Author(s): C.-F. Cheng (程存峰), Y. R. Sun (孙羽), H. Pan (潘虎), J. Wang (王进), A.-W. Liu (刘安雯), A. Campargue, and S.-M. Hu (胡水明) The S (3) electric-quadrupole transition of the (3-0) overtone of molecular hydrogen has been recorded with a continuous-wave cavity ring-down spectrometer and calibrated with sub-megahertz accuracy using a temperature-stabilized Fabry-Pérot interferometer. The collision-induced frequency shift and t... [Phys. Rev. A 85, 024501] Published Mon Feb 06, 2012

Keywords: Atomic and molecular structure and dynamics

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48

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Erratum: Relations between matrix elements of different weak interactions and interpretation of the parity-nonconserving and electron electric-dipole-moment measurements in atoms and molecules [Phys. Rev. A 84, 052108 (2011)] (2012)

V. A. Dzuba, V. V. Flambaum, and C. Harabati

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-07

Description: Author(s): V. A. Dzuba, V. V. Flambaum, and C. Harabati [Phys. Rev. A 85, 029901] Published Mon Feb 06, 2012

Keywords: Errata

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49

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Phase diagram of Landau-Zener phenomena in coupled one-dimensional Bose quantum fluids (2012)

Santiago F. Caballero-Benítez and Rosario Paredes

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-07

Description: Author(s): Santiago F. Caballero-Benítez and Rosario Paredes We study stationary and dynamical properties of the many-body Landau-Zener dynamics of a Bose quantum fluid confined in two coupled one-dimensional chains by using a many-body generalization recently reported Chen et al. [ Nature Phys. 7 61 (2011) ], within the decoupling approximation and the one-l... [Phys. Rev. A 85, 023605] Published Mon Feb 06, 2012

Keywords: Matter waves and collective properties of cold atoms and molecules

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50

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High-fidelity quantum gates in the presence of dispersion (2012)

B. Khani, S. T. Merkel, F. Motzoi, Jay M. Gambetta, and F. K. Wilhelm

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-07

Description: Author(s): B. Khani, S. T. Merkel, F. Motzoi, Jay M. Gambetta, and F. K. Wilhelm We numerically demonstrate the control of motional degrees of freedom of an ensemble of neutral atoms in an optical lattice with a shallow trapping potential. Taking into account the range of quasimomenta across different Brillouin zones results in an ensemble whose members effectively have inhomoge... [Phys. Rev. A 85, 022306] Published Mon Feb 06, 2012

Keywords: Quantum information

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Back-action of a driven nonlinear resonator on a superconducting qubit (2012)

Maxime Boissonneault, A. C. Doherty, F. R. Ong, P. Bertet, D. Vion, D. Esteve, and A. Blais

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-05

Description: Author(s): Maxime Boissonneault, A. C. Doherty, F. R. Ong, P. Bertet, D. Vion, D. Esteve, and A. Blais We study the backaction of a driven nonlinear resonator on a multilevel superconducting qubit. Using unitary transformations on the multilevel Jaynes-Cummings Hamiltonian and quantum optics master equation, we derive an analytical model that goes beyond linear response theory. Within the limits of v... [Phys. Rev. A 85, 022305] Published Fri Feb 03, 2012

Keywords: Quantum information

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52

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Circular differential scattering of polarized light by a chiral random medium (2012)

Jérôme Crassous, Axelle Amon, and Jeanne Crassous

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-08

Description: Author(s): Jérôme Crassous, Axelle Amon, and Jeanne Crassous Differential scattering of left- and right-handed circularly polarized waves is a general property of scattering media lacking space-inversion symmetry. We show in this paper that this scattering difference has remarkable properties in the case of an almost transparent chiral random medium. By tunin... [Phys. Rev. A 85, 023806] Published Tue Feb 07, 2012

Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics

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53

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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)

Adán Cabello

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-10

Description: Author(s): Adán Cabello [Phys. Rev. A 85, 029903] Published Thu Feb 09, 2012

Keywords: Errata

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54

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Monitoring stimulated emission at the single-photon level in one-dimensional atoms (2012)

D. Valente, S. Portolan, G. Nogues, J. P. Poizat, M. Richard, J. M. Gérard, M. F. Santos, and A. Auffèves

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-10

Description: Author(s): D. Valente, S. Portolan, G. Nogues, J. P. Poizat, M. Richard, J. M. Gérard, M. F. Santos, and A. Auffèves We 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

Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics

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55

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Quantum theory analysis of triple photons generated by a χ^{(3)} process (2012)

A. Dot, A. Borne, B. Boulanger, K. Bencheikh, and J. A. Levenson

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-10

Description: Author(s): A. Dot, A. Borne, B. Boulanger, K. Bencheikh, and J. A. Levenson We 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

Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics

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Bose-Einstein condensate as a quantum memory for a photonic polarization qubit (2012)

Stefan Riedl, Matthias Lettner, Christoph Vo, Simon Baur, Gerhard Rempe, and Stephan Dürr

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-14

Description: Author(s): Stefan Riedl, Matthias Lettner, Christoph Vo, Simon Baur, Gerhard Rempe, and Stephan Dürr A scheme based on electromagnetically induced transparency is used to store light in a Bose-Einstein condensate. In this process, a photonic polarization qubit is stored in atomic Zeeman states. The performance of the storage process is characterized and optimized. The average process fidelity is 1.... [Phys. Rev. A 85, 022318] Published Mon Feb 13, 2012

Keywords: Quantum information

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Fermi liquid of two-dimensional polar molecules (2012)

Zhen-Kai Lu and G. V. Shlyapnikov

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-14

Description: Author(s): Zhen-Kai Lu and G. V. Shlyapnikov We study Fermi-liquid properties of a weakly interacting two-dimensional gas of single-component fermionic polar molecules with dipole moments d oriented perpendicularly to the plane of their translational motion. This geometry allows the minimization of inelastic losses due to chemical reactions fo... [Phys. Rev. A 85, 023614] Published Mon Feb 13, 2012

Keywords: Matter waves and collective properties of cold atoms and molecules

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Static-field-induced states and their manifestation in tunneling ionization dynamics of molecules (2012)

Wei-Chao Jiang, Oleg I. Tolstikhin, Liang-You Peng, and Qihuang Gong

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-14

Description: Author(s): Wei-Chao Jiang, Oleg I. Tolstikhin, Liang-You Peng, and Qihuang Gong The physical origin and properties of quasistationary static-field-induced states (SFISs) are discussed. SFISs can be supported by a combination of any atomic or molecular potential and an external static electric field and do not have counterparts in the absence of the field. A resonant tunneling i... [Phys. Rev. A 85, 023404] Published Mon Feb 13, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Tight lower bound to the geometric measure of quantum discord (2012)

Ali Saif M. Hassan, Behzad Lari, and Pramod S. Joag

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-14

Description: Author(s): Ali Saif M. Hassan, Behzad Lari, and Pramod S. Joag Dakic, Vedral, and Brukner [ B. Dakic, V. Vedral and Č. Brukner Phys. Rev. Lett. 105 190502 (2010) ] gave a geometric measure of quantum discord in a bipartite quantum state as the distance of the state from the closest classical quantum (or zero discord) state and derived an explicit formula for a ... [Phys. Rev. A 85, 024302] Published Mon Feb 13, 2012

Keywords: Quantum information

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Magnetic-field-dependent trap loss of ultracold metastable helium (2012)

J. S. Borbely, R. van Rooij, S. Knoop, and W. Vassen

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-15

Description: Author(s): J. S. Borbely, R. van Rooij, S. Knoop, and W. Vassen We have experimentally studied the magnetic-field dependence of the decay of a Bose-Einstein condensate of metastable 4 He atoms confined in an optical dipole trap, for atoms in the m =+1 and m =−1 magnetic substates, and up to 450 G. Our measurements confirm longstanding calculations of the two-body l... [Phys. Rev. A 85, 022706] Published Tue Feb 14, 2012

Keywords: Atomic and molecular collisions and interactions

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Electron transfer in fast proton-helium collisions (2012)

Hong-Keun Kim, M. S. Schöffler, S. Houamer, O. Chuluunbaatar, J. N. Titze, L. Ph. H. Schmidt, T. Jahnke, H. Schmidt-Böcking, A. Galstyan, Yu. V. Popov, and R. Dörner

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-15

Description: Author(s): Hong-Keun Kim, M. S. Schöffler, S. Houamer, O. Chuluunbaatar, J. N. Titze, L. Ph. H. Schmidt, T. Jahnke, H. Schmidt-Böcking, A. Galstyan, Yu. V. Popov, and R. Dörner We have measured the electron-transfer process in fast collisions (630–1200 keV/u) of protons with helium, which is dependent on the projectile scattering angle and the final electronic state. The fully differential data accompanied by theoretical second-order perturbation theory allow a detailed in... [Phys. Rev. A 85, 022707] Published Tue Feb 14, 2012

Keywords: Atomic and molecular collisions and interactions

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Phase dependence of dynamical manipulation of NaI predissociation (2012)

Yuanxing Liu, Yunquan Liu, and Qihuang Gong

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-15

Description: Author(s): Yuanxing Liu, Yunquan Liu, and Qihuang Gong We propose a dynamic pump-control scheme to manipulate the molecular predissociation process of NaI using two color few-cycle laser pulses. We excite the NaI molecule with a pump pulse (648 nm, 35 fs) and employ another control laser pulse (7.53 μm, 50 fs) to modify the molecular potential energy su... [Phys. Rev. A 85, 023406] Published Tue Feb 14, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Penetration of a vortex dipole across an interface of Bose-Einstein condensates (2012)

Tomohiko Aioi, Tsuyoshi Kadokura, and Hiroki Saito

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-15

Description: Author(s): Tomohiko Aioi, Tsuyoshi Kadokura, and Hiroki Saito The dynamics of a vortex dipole in a quasi-two-dimensional two-component Bose-Einstein condensate is investigated. A vortex dipole is shown to penetrate the interface between the two components when the incident velocity is sufficiently large. A vortex dipole can also disappear or disintegrate at th... [Phys. Rev. A 85, 023618] Published Tue Feb 14, 2012

Keywords: Matter waves and collective properties of cold atoms and molecules

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Quantum phase transitions of ultracold Bose systems in nonrectangular optical lattices (2012)

Zhi Lin, Jun Zhang, and Ying Jiang

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-15

Description: Author(s): Zhi Lin, Jun Zhang, and Ying Jiang In this paper, we investigate systematically the Mott-insulator–superfluid quantum phase transitions for ultracold scalar bosons in triangular, hexagonal, and Kagomé optical lattices. With the help of the field-theoretical effective potential, by treating the hopping term in the Bose-Hubbard model a... [Phys. Rev. A 85, 023619] Published Tue Feb 14, 2012

Keywords: Matter waves and collective properties of cold atoms and molecules

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Three-dimensional Bose gas near a Feshbach resonance (2012)

Dmitry Borzov, Mohammad S. Mashayekhi, Shizhong Zhang, Jun-Liang Song, and Fei Zhou

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-15

Description: Author(s): Dmitry Borzov, Mohammad S. Mashayekhi, Shizhong Zhang, Jun-Liang Song, and Fei Zhou In this paper, we explore the nature of three-dimensional Bose gases at large positive scattering lengths via resummation of dominating processes involving a minimum number of virtual atoms. We focus on the energetics of the nearly fermionized Bose gases beyond the usual dilute limit. We also find t... [Phys. Rev. A 85, 023620] Published Tue Feb 14, 2012

Keywords: Matter waves and collective properties of cold atoms and molecules

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Nonexponential one-body loss in a Bose-Einstein condensate (2012)

S. Knoop, J. S. Borbely, R. van Rooij, and W. Vassen

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-15

Description: Author(s): S. Knoop, J. S. Borbely, R. van Rooij, and W. Vassen We have studied the decay of a Bose-Einstein condensate (BEC) of metastable helium atoms in an optical dipole trap. In the regime where two- and three-body losses can be neglected we show that the Bose-Einstein condensate and the thermal cloud show fundamentally different decay characteristics. The ... [Phys. Rev. A 85, 025602] Published Tue Feb 14, 2012

Keywords: Matter waves and collective properties of cold atoms and molecules

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Photon-number distributions of twin beams generated in spontaneous parametric down-conversion and measured by an intensified CCD camera (2012)

Jan Peřina, Jr., Martin Hamar, Václav Michálek, and Ondřej Haderka

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-15

Description: Author(s): Jan Peřina, Jr., Martin Hamar, Václav Michálek, and Ondřej Haderka The measurement of photon-number statistics of fields composed of photon pairs, generated in spontaneous parametric down-conversion and detected by an intensified charge-coupled device (iCCD) camera, is described. Final quantum detection efficiencies, electronic noises, finite numbers of detector pi... [Phys. Rev. A 85, 023816] Published Tue Feb 14, 2012

Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics

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Pairing instabilities in quasi-two-dimensional Fermi gases (2012)

Ville Pietilä, David Pekker, Yusuke Nishida, and Eugene Demler

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-15

Description: Author(s): Ville Pietilä, David Pekker, Yusuke Nishida, and Eugene Demler We study nonequilibrium dynamics of ultracold two-component Fermi gases in low-dimensional geometries after the interactions are quenched from a weakly interacting to a strongly interacting regime. We develop a T -matrix formalism that takes into account the interplay between Pauli blocking and tight... [Phys. Rev. A 85, 023621] Published Tue Feb 14, 2012

Keywords: Matter waves and collective properties of cold atoms and molecules

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Quantum defects of nonpenetrating Rydberg states of the SO molecule in adiabatic and nonadiabatic regions of the spectrum (2012)

Dmitry L. Dorofeev, Sergei V. Elfimov, and Boris A. Zon

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-15

Description: Author(s): Dmitry L. Dorofeev, Sergei V. Elfimov, and Boris A. Zon This paper is dedicated to the implementation of a generalized approach for calculating quantum defects in high Rydberg states of polar molecules with an account for the dipole moment of the molecular core and l uncoupling of the Rydberg electron. Adiabatic (Born-Oppenheimer) and nonadiabatic (inver... [Phys. Rev. A 85, 022509] Published Tue Feb 14, 2012

Keywords: Atomic and molecular structure and dynamics

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Mixed-partial-wave scattering with spin-orbit coupling and validity of pseudopotentials (2012)

Xiaoling Cui

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-15

Description: Author(s): Xiaoling Cui We present exact solutions of a two-body problem for spin- 1/2 fermions with isotropic spin-orbit (SO) coupling and interacting with an arbitrary short-range potential. We find that in each partial-wave scattering channel, the parametrization of a two-body wave function at short interparticle distanc... [Phys. Rev. A 85, 022705] Published Tue Feb 14, 2012

Keywords: Atomic and molecular collisions and interactions

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Electron scattering and photoionization of one-electron diatomic molecules (2012)

Haruhide Miyagi, Toru Morishita, and Shinichi Watanabe

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-16

Description: Author(s): Haruhide Miyagi, Toru Morishita, and Shinichi Watanabe We develop an efficient numerical procedure for solving the scattering problem on one-electron diatomic molecules in the fixed-nuclei approximation. For this purpose, we use the R -matrix propagation method together with the discrete variable representation method in prolate spheroidal coordinates. T... [Phys. Rev. A 85, 022708] Published Wed Feb 15, 2012

Keywords: Atomic and molecular collisions and interactions

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Homogenization of Bell inequalities (2012)

Yu-Chun Wu and Marek Żukowski

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-22

Description: Author(s): Yu-Chun Wu and Marek Żukowski A technique, which we call homogenization, is applied to transform Clauser and Horne- (CH)-type Bell inequalities that contain lower-order correlations into CH, Shimony, and Holt- (CHSH)-type Bell inequalities, which are defined for highest-order correlation functions. A homogenization leads to ineq... [Phys. Rev. A 85, 022119] Published Tue Feb 21, 2012

Keywords: Fundamental concepts

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Local and nonlocal spatial densities in quantum field theory (2012)

R. E. Wagner, M. R. Ware, E. V. Stefanovich, Q. Su, and R. Grobe

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-22

Description: Author(s): R. E. Wagner, M. R. Ware, E. V. Stefanovich, Q. Su, and R. Grobe We use a one-dimensional model system to compare the predictions of two different yardsticks to compute the position of a particle from its quantum field theoretical state. Based on the first yardstick (defined by the Newton-Wigner position operator), the spatial density can be arbitrarily narrow, a... [Phys. Rev. A 85, 022121] Published Tue Feb 21, 2012

Keywords: Fundamental concepts

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Adiabaticity in the lateral electron-momentum distribution after strong-field ionization (2012)

Jost Henkel, Manfred Lein, Volker Engel, and Ingo Dreissigacker

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-22

Description: Author(s): Jost Henkel, Manfred Lein, Volker Engel, and Ingo Dreissigacker By solving the time-dependent Schrödinger equation for atoms in short laser pulses of different polarizations, it is shown that in strong-field ionization without rescattering, the lateral width of the electron-momentum distribution corresponds adiabatically to the instantaneous laser field on a sub... [Phys. Rev. A 85, 021402] Published Tue Feb 21, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Evaluation of the screened vacuum-polarization corrections to the hyperfine splitting of Li-like bismuth (2012)

O. V. Andreev, D. A. Glazov, A. V. Volotka, V. M. Shabaev, and G. Plunien

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-22

Description: Author(s): O. V. Andreev, D. A. Glazov, A. V. Volotka, V. M. Shabaev, and G. Plunien The rigorous calculation of the vacuum-polarization screening corrections to the hyperfine splitting in Li-like bismuth is presented. The two-electron diagrams with electric and magnetic vacuum-polarization loops are evaluated to all orders in α Z , including the Wichmann-Kroll contributions. This imp... [Phys. Rev. A 85, 022510] Published Tue Feb 21, 2012

Keywords: Atomic and molecular structure and dynamics

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Spectral properties of photon pairs generated by spontaneous four-wave mixing in inhomogeneous photonic crystal fibers (2012)

Liang Cui, Xiaoying Li, and Ningbo Zhao

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-22

Description: Author(s): Liang Cui, Xiaoying Li, and Ningbo Zhao The photonic crystal fiber (PCF) is one of the excellent media for generating photon pairs via spontaneous four-wave mixing. Here we study how the inhomogeneity of PCFs affect the spectral properties of photon pairs from both the theoretical and experimental aspects. The theoretical model shows that... [Phys. Rev. A 85, 023825] Published Tue Feb 21, 2012

Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics

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Atom slowing via dispersive optical interactions (2012)

M. Hamamda, M. Boustimi, F. Correia, J. Baudon, T. Taillandier-Loize, G. Dutier, F. Perales, and M. Ducloy

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-22

Description: Author(s): M. Hamamda, M. Boustimi, F. Correia, J. Baudon, T. Taillandier-Loize, G. Dutier, F. Perales, and M. Ducloy A promising technique of atom slowing is proposed. It is based upon the dispersive interaction of atoms with optical potential pulses generated by a far-off-resonance standing wave modulated in time. Each pulse reduces the velocity by a small amount. By repeating the process thousands of times, the ... [Phys. Rev. A 85, 023417] Published Tue Feb 21, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Phase diagrams of two-dimensional and three-dimensional disordered Bose gases in the local density approximation (2012)

Thomas Bourdel

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-22

Description: Author(s): Thomas Bourdel We study superfluid transitions in bidimensional (2D) and tridimensional (3D) disordered and interacting Bose gases. We work in the limit of long-range correlated disorder such that it can be treated in the local density approximation. We present superfluid transition curves in both the disorder-tem... [Phys. Rev. A 86, 063626] Published Fri Dec 21, 2012

Keywords: Matter waves and collective properties of cold atoms and molecules

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Nonequilibrium quantum phase transitions in the Ising model (2012)

V. M. Bastidas, C. Emary, G. Schaller, and T. Brandes

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-22

Description: Author(s): V. M. Bastidas, C. Emary, G. Schaller, and T. Brandes We establish a set of nonequilibrium quantum phase transitions in the Ising model driven under monochromatic nonadiabatic modulation of the transverse field. We show that besides the Ising-like critical behavior, the system exhibits an anisotropic transition which is absent in equilibrium. The noneq... [Phys. Rev. A 86, 063627] Published Fri Dec 21, 2012

Keywords: Matter waves and collective properties of cold atoms and molecules

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Quantum rainbow scattering at tunable velocities (2012)

M. Strebel, T.-O. Müller, B. Ruff, F. Stienkemeier, and M. Mudrich

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-22

Description: Author(s): M. Strebel, T.-O. Müller, B. Ruff, F. Stienkemeier, and M. Mudrich Elastic scattering cross sections are measured for lithium atoms colliding with rare-gas atoms and SF 6 molecules at tunable relative velocities down to ∼50 m/s. Our scattering apparatus combines a velocity-tunable molecular beam with a magneto-optic trap which provides an ultracold cloud of lithium ... [Phys. Rev. A 86, 062711] Published Fri Dec 21, 2012

Keywords: Atomic and molecular collisions and interactions

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Observation of the 717-nm electric quadrupole transition in triply charged thorium (2012)

A. G. Radnaev, C. J. Campbell, and A. Kuzmich

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-27

Description: Author(s): A. G. Radnaev, C. J. Campbell, and A. Kuzmich We excite the 717-nm electric quadrupole 6 D 3/2 ↔ 7 S 1/2 transition in a laser-cooled 232 Th 3+ ion crystal. The transition frequency and the lifetime of the metastable 7 S 1/2 level are measured to be 417 845 964(30) MHz and 0.60(7) s, respectively. We subsequently employ the 7 S 1/2 level to drive the ion... [Phys. Rev. A 86, 060501] Published Wed Dec 26, 2012

Keywords: Atomic and molecular structure and dynamics

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Initial correlation in a system of a spin coupled to a spin bath through an intermediate spin (2012)

V. Semin, I. Sinayskiy, and F. Petruccione

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-27

Description: Author(s): V. Semin, I. Sinayskiy, and F. Petruccione The strong system-bath correlation is a typical initial condition in many condensed matter and some quantum optical systems. Here, the dynamics of a spin interacting with a spin bath through an intermediate spin are studied. Initial correlations between the spin and the intermediate spin are taken i... [Phys. Rev. A 86, 062114] Published Wed Dec 26, 2012

Keywords: Fundamental concepts

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83

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Time-dependent variational principle for dissipative dynamics (2012)

Christina V. Kraus and Tobias J. Osborne

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-27

Description: Author(s): Christina V. Kraus and Tobias J. Osborne We extend the time-dependent variational principle to the setting of dissipative dynamics. This provides a locally optimal (in time) approximation to the dynamics of any Lindblad equation within a given variational manifold of mixed states. In contrast to the pure-state setting, there is no canonica... [Phys. Rev. A 86, 062115] Published Wed Dec 26, 2012

Keywords: Fundamental concepts

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Analytical study of quadratic and nonquadratic short-time behavior of quantum decay (2012)

Sergio Cordero and Gastón García–Calderón

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-27

Description: Author(s): Sergio Cordero and Gastón García–Calderón The short-time behavior of quantum decay of an unstable state initially located within an interaction region of finite range is investigated using a resonant expansion of the survival amplitude. It is shown that in general the short-time behavior of the survival probability S ( t ) has a dependence on ... [Phys. Rev. A 86, 062116] Published Wed Dec 26, 2012

Keywords: Fundamental concepts

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85

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Towards a complete and continuous Wigner function for an ensemble of spins or qubits (2012)

Derek Harland, M. J. Everitt, Kae Nemoto, T. Tilma, and T. P. Spiller

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-27

Description: Author(s): Derek Harland, M. J. Everitt, Kae Nemoto, T. Tilma, and T. P. Spiller We present a quasiprobability distribution function for ensembles of spin-half particles or qubits that has many properties in common with Wigner's original function for systems of continuous variables. We show that this function provides clear and intuitive graphical representation of a wide variet... [Phys. Rev. A 86, 062117] Published Wed Dec 26, 2012

Keywords: Fundamental concepts

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86

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Delay time as a quantum transient interference effect (2012)

Gastón García-Calderón and Alberto Hernández-Maldonado

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-27

Description: Author(s): Gastón García-Calderón and Alberto Hernández-Maldonado We consider an exact analytical solution to the time-dependent Schrödinger equation with cutoff initial conditions (quantum shutter setup) to show that in such a case the delay time in the dynamics of resonant tunneling near resonance arises from an interference effect of the quantum transients of t... [Phys. Rev. A 86, 062118] Published Wed Dec 26, 2012

Keywords: Fundamental concepts

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87

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Entanglement and area laws in weakly correlated Gaussian states (2012)

J. M. Matera, R. Rossignoli, and N. Canosa

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-27

Description: Author(s): J. M. Matera, R. Rossignoli, and N. Canosa We examine the evaluation of entanglement measures in weakly correlated Gaussian states. It is shown that they can be expressed in terms of the singular values of a particular block of the generalized contraction matrix. This result enables us to obtain in a simple way asymptotic expressions and rel... [Phys. Rev. A 86, 062324] Published Wed Dec 26, 2012

Keywords: Quantum information

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88

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Imperfect measurement settings: Implications for quantum state tomography and entanglement witnesses (2012)

Denis Rosset, Raphael Ferretti-Schöbitz, Jean-Daniel Bancal, Nicolas Gisin, and Yeong-Cherng Liang

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-27

Description: Author(s): Denis Rosset, Raphael Ferretti-Schöbitz, Jean-Daniel Bancal, Nicolas Gisin, and Yeong-Cherng Liang Reliable and well-characterized quantum resources are indispensable ingredients in quantum information processing. Typically, in a realistic characterization of these resources, apparatuses come with intrinsic uncertainties that can manifest themselves in the form of systematic errors. While systema... [Phys. Rev. A 86, 062325] Published Wed Dec 26, 2012

Keywords: Quantum information

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89

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van der Waals interaction as a summable asymptotic series (2012)

John P. Perdew, Adrienn Ruzsinszky, Jianwei Sun, Stephen Glindmeyer, and Gabor I. Csonka

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-27

Description: Author(s): John P. Perdew, Adrienn Ruzsinszky, Jianwei Sun, Stephen Glindmeyer, and Gabor I. Csonka The dynamic multipole polarizabilities and thus the second-order van der Waals coefficients C 2 k of all orders are known exactly for the interaction between two classical spherical conducting shells, each of uniform electron density ρ with outer radius R and thickness t . The result is C 2 k =− c k ( t / R )√ 4 π ... [Phys. Rev. A 86, 062714] Published Wed Dec 26, 2012

Keywords: Atomic and molecular collisions and interactions

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90

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Influence of multiple ionization thresholds on harmonic generation from Ar^{+} (2012)

A. C. Brown and H. W. van der Hart

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-27

Description: Author(s): A. C. Brown and H. W. van der Hart We apply time-dependent R -matrix theory to investigate harmonic generation from ground-state Ar + with M =0 at a wavelength of 390 nm. Contributions associated with the different 3 s 2 3 p 4 ionization thresholds are assessed, including the interference between these. The dominant contribution originates f... [Phys. Rev. A 86, 063416] Published Wed Dec 26, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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91

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Optimal-control theory of harmonic generation (2012)

Ido Schaefer and Ronnie Kosloff

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-27

Description: Author(s): Ido Schaefer and Ronnie Kosloff Coherent control of harmonic generation was studied theoretically. A specific harmonic order was targeted. An optimal control theory was employed to find the driving field where restrictions were imposed on the frequency band. Additional restrictions were added to suppress undesired outcomes, such a... [Phys. Rev. A 86, 063417] Published Wed Dec 26, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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92

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Excitation of Rydberg wave packets with chirped laser pulses (2012)

J. Preclíková, M. Kozák, D. Fregenal, Ø. Frette, B. Hamre, B. T. Hjertaker, J. P. Hansen, and L. Kocbach

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-27

Description: Author(s): J. Preclíková, M. Kozák, D. Fregenal, Ø. Frette, B. Hamre, B. T. Hjertaker, J. P. Hansen, and L. Kocbach We study Rydberg wave packets produced by pairs of time separated femtosecond laser pulses. The time separation ranges from femtosecond to picosecond time scales. The wave packets consist predominantly of f states of principal quantum numbers n =22–32 in Li. With a direct analysis of the field ioniza... [Phys. Rev. A 86, 063418] Published Wed Dec 26, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Evidence of sympathetic cooling of Na^{+} ions by a Na magneto-optical trap in a hybrid trap (2012)

I. Sivarajah, D. S. Goodman, J. E. Wells, F. A. Narducci, and W. W. Smith

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-27

Description: Author(s): I. Sivarajah, D. S. Goodman, J. E. Wells, F. A. Narducci, and W. W. Smith A hybrid ion-neutral trap provides an ideal system to study collisional dynamics between ions and neutral atoms. This system provides a general cooling method that can be applied to species that do not have optically accessible transitions and can also potentially cool internal degrees of freedom. T... [Phys. Rev. A 86, 063419] Published Wed Dec 26, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Enhancing photoassociation rates by nonresonant-light control of shape resonances (2012)

Rosario González-Férez and Christiane P. Koch

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-27

Description: Author(s): Rosario González-Férez and Christiane P. Koch Photoassociation, assembling molecules from atoms using laser light, is limited by the low density of atom pairs at sufficiently short interatomic separations. Here we show that nonresonant light with intensities of the order of 10 10 W/cm 2 modifies the thermal cloud of atoms, enhancing the Boltzmann... [Phys. Rev. A 86, 063420] Published Wed Dec 26, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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95

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Hybrid model for Rydberg gases including exact two-body correlations (2012)

Kilian P. Heeg, Martin Gärttner, and Jörg Evers

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-27

Description: Author(s): Kilian P. Heeg, Martin Gärttner, and Jörg Evers A model for the simulation of ensembles of laser-driven Rydberg-Rydberg interacting multilevel atoms is discussed. Our hybrid approach combines an exact two-body treatment of nearby atom pairs with an effective approximate treatment for spatially separated pairs. We propose an optimized evolution eq... [Phys. Rev. A 86, 063421] Published Wed Dec 26, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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96

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Spin-orbit-coupled Bose-Einstein condensates confined in concentrically coupled annular traps (2012)

Xiao-Fei Zhang, Rui-Fang Dong, Tao Liu, W. M. Liu, and Shou-Gang Zhang

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-27

Description: Author(s): Xiao-Fei Zhang, Rui-Fang Dong, Tao Liu, W. M. Liu, and Shou-Gang Zhang We investigate the ground state of spin-orbit-coupled Bose-Einstein condensates confined in concentrically coupled annular traps within the full parameter space accounts for all the nonlinear two-body collisions and the spin-orbit coupling. We find that depending on the ratio between interaction par... [Phys. Rev. A 86, 063628] Published Wed Dec 26, 2012

Keywords: Matter waves and collective properties of cold atoms and molecules

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97

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Macroscopic quantum tunneling of Bose-Einstein condensates with long-range interaction (2012)

Kai Marquardt, Pascal Wieland, Rolf Häfner, Holger Cartarius, Jörg Main, and Günter Wunner

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-27

Description: Author(s): Kai Marquardt, Pascal Wieland, Rolf Häfner, Holger Cartarius, Jörg Main, and Günter Wunner The ground state of Bose-Einstein condensates with attractive particle interactions is metastable. One of the decay mechanisms of the condensate is a collapse by macroscopic quantum tunneling, which can be described by the bounce trajectory as a solution of the time-dependent Gross-Pitaevskii equati... [Phys. Rev. A 86, 063629] Published Wed Dec 26, 2012

Keywords: Matter waves and collective properties of cold atoms and molecules

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Gaussian postselection and virtual noiseless amplification in continuous-variable quantum key distribution (2012)

Jaromír Fiurášek and Nicolas J. Cerf

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-27

Description: Author(s): Jaromír Fiurášek and Nicolas J. Cerf Noiseless amplification or attenuation are two heralded filtering operations that enable amplifying or de-amplifying a quantum state of light with no added noise, at the cost of a small success probability. We show that inserting such noiseless operations in a transmission line improves the performa... [Phys. Rev. A 86, 060302] Published Wed Dec 26, 2012

Keywords: Quantum information

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99

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Attosecond time-delay spectroscopy of the hydrogen molecule (2012)

I. A. Ivanov, A. S. Kheifets, and Vladislav V. Serov

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-28

Description: Author(s): I. A. Ivanov, A. S. Kheifets, and Vladislav V. Serov We apply the concept of photoemission time delay to the process of single-photon one-electron ionization of the H 2 molecule. We demonstrate that, by resolving the photoelectron detection in time on the attosecond scale, one can extract differential photoionization cross sections for particular field... [Phys. Rev. A 86, 063422] Published Thu Dec 27, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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100

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Diagrammatic approach to attosecond delays in photoionization (2012)

J. M. Dahlström, T. Carette, and E. Lindroth

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-28

Description: Author(s): J. M. Dahlström, T. Carette, and E. Lindroth We study laser-assisted photoionization by attosecond pulses using a time-independent formalism based on diagrammatic many-body perturbation theory. Our aim is to provide an ab initio route to the “delays” for this above-threshold ionization process, which is essential for a quantitative understandi... [Phys. Rev. A 86, 061402] Published Thu Dec 27, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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