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Beyond-mean-field behavior of large Bose-Einstein condensates in double-well potentials (2013)

Bettina Gertjerenken and Christoph Weiss

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-07

Description: Author(s): Bettina Gertjerenken and Christoph Weiss For the dynamics of Bose-Einstein condensates (BECs), differences between mean-field (Gross-Pitaevskii) physics and N -particle quantum physics often disappear if the BEC becomes larger and larger. In particular, the time scale for which both dynamics agree should thus become larger if the particle n... [Phys. Rev. A 88, 033608] Published Fri Sep 06, 2013

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

Print ISSN: 1050-2947

Electronic ISSN: 1094-1622

Topics: Physics

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Laser-controlled rotational cooling of Na_{2} based on exceptional points (2013)

V. Kokoouline, A. Wearne, R. Lefebvre, and O. Atabek

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-07

Description: Author(s): V. Kokoouline, A. Wearne, R. Lefebvre, and O. Atabek Exceptional points (EPs) corresponding to resonance coalescence (i.e., complex energy degeneracy and identical wave functions) occur in many areas of non-Hermitian physics and, in particular, in laser-induced molecular dynamics for specific choices of two control parameters. We have previously shown... [Phys. Rev. A 88, 033408] Published Fri Sep 06, 2013

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

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Electronic ISSN: 1094-1622

Topics: Physics

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Quantum search with interacting Bose-Einstein condensates (2013)

Mahdi Ebrahimi Kahou and David L. Feder

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-12

Description: Author(s): Mahdi Ebrahimi Kahou and David L. Feder One approach to the development of quantum search algorithms is the quantum walk. A spatial search can be effected by the continuous-time evolution of a single quantum particle on a graph containing a marked site. In many physical implementations, however, one might expect to have multiple particles... [Phys. Rev. A 88, 032310] Published Wed Sep 11, 2013

Keywords: Quantum information

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Hyperfine effects on potassium tune-out wavelengths and polarizabilities (2013)

Jun Jiang and J. Mitroy

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-12

Description: Author(s): Jun Jiang and J. Mitroy The influence of hyperfine interactions on the tune-out wavelengths of the 39 K, 40 K, and 41 K isotopes of the potassium atom was investigated. The hyperfine interaction of the 4 s 1/2 ground state results in a shift and splitting of the primary tune-out wavelength near 769 nm. The 4 s 1/2 state hyperfine... [Phys. Rev. A 88, 032505] Published Wed Sep 11, 2013

Keywords: Atomic and molecular structure and dynamics

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Formation of antihydrogen in an antiproton-positron Debye plasma in the presence of an external laser field (2013)

Sougata Mukhopadhyay and C. Sinha

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-12

Description: Author(s): Sougata Mukhopadhyay and C. Sinha We study quantum mechanically the influence of an external laser field on the antihydrogen (H̅ ) formation cross sections in ground and excited states (2 s ,2 p ) via the three-body recombination process inside a dense plasma of antiprotons and positrons, supposed to be the most efficient mechani... [Phys. Rev. A 88, 033414] Published Wed Sep 11, 2013

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

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Electronic ISSN: 1094-1622

Topics: Physics

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Thermodynamics of strongly correlated one-dimensional Bose gases (2013)

Andreas Vogler, Ralf Labouvie, Felix Stubenrauch, Giovanni Barontini, Vera Guarrera, and Herwig Ott

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-12

Description: Author(s): Andreas Vogler, Ralf Labouvie, Felix Stubenrauch, Giovanni Barontini, Vera Guarrera, and Herwig Ott We investigate the thermodynamics of one-dimensional (1D) Bose gases in the strongly correlated regime. To this end, we prepare ensembles of independent 1D Bose gases in a two-dimensional optical lattice and perform high-resolution in situ imaging of the column-integrated density distribution. Using... [Phys. Rev. A 88, 031603] Published Wed Sep 11, 2013

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

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Parrondo's paradox and superactivation of classical and quantum capacity of communication channels with memory (2013)

Sergii Strelchuk

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-12

Description: Author(s): Sergii Strelchuk There exist memoryless zero-capacity quantum channels that when used jointly result in a channel with positive capacity. This phenomenon is called superactivation. Making use of Parrondo's paradox, we exhibit examples of the superactivation-like effect for the capacity of classical communication cha... [Phys. Rev. A 88, 032311] Published Wed Sep 11, 2013

Keywords: Quantum information

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Experimental observations of s-p coupling in copper dimer anions (2013)

Benkang Liu, Yanqiu Wang, and Li Wang

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-12

Description: Author(s): Benkang Liu, Yanqiu Wang, and Li Wang The photoelectron velocity-map image technique was employed to examine the one-photon detachment of Cu monomer and dimer anions using a linearly polarized infrared femtosecond laser. While the photoelectron angular distribution (PAD) in a single-photon detachment experiment of Cu − shows no dependenc... [Phys. Rev. A 88, 033413] Published Wed Sep 11, 2013

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

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Large quantum superpositions of a levitated nanodiamond through spin-optomechanical coupling (2013)

Zhang-qi Yin, Tongcang Li, Xiang Zhang, and L. M. Duan

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-12

Description: Author(s): Zhang-qi Yin, Tongcang Li, Xiang Zhang, and L. M. Duan We propose a method to generate and detect large quantum superposition states and arbitrary Fock states for the oscillational mode of an optically levitated nanocrystal diamond. The nonlinear interaction required for the generation of non-Gaussian quantum states is enabled through the spin-mechanica... [Phys. Rev. A 88, 033614] Published Wed Sep 11, 2013

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

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Reconstructing the profile of time-varying magnetic fields with quantum sensors (2013)

Easwar Magesan, Alexandre Cooper, Honam Yum, and Paola Cappellaro

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-13

Description: Author(s): Easwar Magesan, Alexandre Cooper, Honam Yum, and Paola Cappellaro Quantum systems have shown great promise for precision metrology thanks to advances in their control. This has allowed not only the sensitive estimation of external parameters but also the reconstruction of their temporal profile. In particular, quantum control techniques and orthogonal function the... [Phys. Rev. A 88, 032107] Published Thu Sep 12, 2013

Keywords: Fundamental concepts

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