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    • Article
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    Nullity of quantum discord of two-qubit X-state systems

    Li, Gao-Xiang, Yi, Zhen, Ficek, Zbigniew
    Cornell University
    Disponible
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    Titre: Nullity of quantum discord of two-qubit X-state systems
    Auteur: Li, Gao-Xiang; Yi, Zhen; Ficek, Zbigniew
    Sujet: Quantum Physics
    Description: The conditions are established for nullity of quantum discord for mixed states of a general two-qubit system whose dynamical behaviour is given by an X-state form density matrix. It is found that quantum discord can vanish at a finite time even in the presence of correlations between qubits. The degeneracy of the populations of the combined states of the qubits and the multi-qubit quantum coherences are shown to be responsible for vanishing of the discord. We illustrate our considerations by examining the coherent-state Tavis-Cummings model in which two qubits interact dispersively with the cavity field. The disappearance of the discord is shown to be dependent on the initial atomic conditions that it may occur at a discrete instance or periodically at discrete instances redistributed over whole range of the evolution time. The nullity of the discord is interpreted as resulting from equal preparation of the spin anti-correlated and spin correlated product states in superposition~states. Comment: 5 pages, 3 figures
    Identifiant: 1101.4983 (ARXIV ID)

    • Livre
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    Introduction to modern quantum optics

    Peng, Jin-Sheng
    Li, Gao-Xiang
    Singapore [etc.] : World Scientific
    [1998]
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    Titre: Introduction to modern quantum optics / Jin-Sheng Peng, Gao-Xiang Li
    Auteur: Peng, Jin-Sheng
    Contributeur: Li, Gao-Xiang
    Editeur: Singapore [etc.] : World Scientific
    Date: [1998]
    Collation: XVI, 562 p. : fig. ; 22 cm
    Classification: LC QC446.2
    Identifiant: 9810234481 (ISBN)
    No RERO: R003031763
    Permalien:
    http://data.rero.ch/01-R003031763/html?view=FR_V1

    • Article
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    Thermal emission from layered structures containing a negative-zero-positive index metamaterial

    Wang, Li-Gang, Li, Gao-Xiang, Zhu, Shi-Yao
    Physical Review B, 2/2010, Vol.81(7) [Revue évaluée par les pairs]
    American Physical Society (APS) (via CrossRef)
    Disponible
    Plus…
    Titre: Thermal emission from layered structures containing a negative-zero-positive index metamaterial
    Auteur: Wang, Li-Gang; Li, Gao-Xiang; Zhu, Shi-Yao
    Fait partie de: Physical Review B, 2/2010, Vol.81(7)
    Identifiant: 1098-0121 (ISSN); 1550-235X (E-ISSN); http (DOI)

    • Plusieurs versions

    Phonon-mediated squeezing of the cavity field off-resonantly coupled with a coherently driven quantum dot

    Zhu, Jia-Pei, Huang, Hui, Li, Gao-Xiang
    Journal of Applied Physics, 21 January 2014, Vol.115(3) [Revue évaluée par les pairs]

    • Article
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    Ground-state cooling of a mechanical resonator by single- and two-phonon processes

    Zhu, Jia-Pei, Li, Gao-Xiang
    Journal of Applied Physics, 01 February 2012, Vol.111(3) [Revue évaluée par les pairs]
    © 2012 American Institute of Physics (AIP)
    Disponible
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    Titre: Ground-state cooling of a mechanical resonator by single- and two-phonon processes
    Auteur: Zhu, Jia-Pei; Li, Gao-Xiang
    Sujet: Articles
    Description: A scheme for ground-state cooling of a mechanical resonator by single- and two-phonon processes is analyzed. The mechanical resonator is coupled to two coupled quantum dots forming an effective Λ-type three-level structure and connected with two normal metal leads. The quantum dots are driven by two light fields; by choosing appropriate parameters, the electron can be trapped in the dark state of the system, a superposition of the two ground states. When the single-phonon absorption and emission processes are dominant, under the weak (strong) driving field circumstances, the mechanical resonator is cooled through absorbing a phonon when the electron jumps from dark state to bright state (one of the dressed states) and then tunnels out of the two coupled dots. Net cooling of the resonator to its ground state is possible in the absence of the electron-phonon dephasing via single-phonon processes. When the two-phonon processes are tuned to be stronger than the single-phonon processes, the mechanical resonator can be cooled to its nonclassical state.
    Fait partie de: Journal of Applied Physics, 01 February 2012, Vol.111(3)
    Identifiant: 0021-8979 (ISSN); 1089-7550 (E-ISSN); 10.1063/1.3679541 (DOI)

    • Plusieurs versions

    Creation of pure multi-mode entangled states in a ring cavity

    Li, Gao-Xiang, Ficek, Zbigniew
    Optics communications, 2010, Vol.283(5), pp.814-821 [Revue évaluée par les pairs]

    • Plusieurs versions

    Influence of phonon reservoir on photon blockade in a driven quantum dot-cavity system

    Gao, Bo, Zhu, Jia-Pei, Li, Gao-Xiang
    Journal of Applied Physics, 14 March 2016, Vol.119(10) [Revue évaluée par les pairs]

    • Plusieurs versions

    Collective dynamics and entanglement of two distant atoms embedded into single-negative index material

    Fang, Wei, Li, Gao-Xiang, Yang, Yaping, Ficek, Zbigniew
    Optics express, 06 February 2017, Vol.25(3), pp.1867-1888 [Revue évaluée par les pairs]

    • Plusieurs versions

    Engineering a squeezed phonon reservoir with a bichromatic driving of a quantum dot

    Gao, Bo, Li, Gao-Xiang, Ficek, Zbigniew
    Physical Review A, 9/2016, Vol.94(3) [Revue évaluée par les pairs]

    • Article
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    Polychromatic quadripartite entanglement from concurrent four-wave mixing in a three-level atomic system

    Tan, Hua-Tang, Li, Gao-Xiang
    Physical Review A, 9/2010, Vol.82(3) [Revue évaluée par les pairs]
    American Physical Society (APS) (via CrossRef)
    Disponible
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    Titre: Polychromatic quadripartite entanglement from concurrent four-wave mixing in a three-level atomic system
    Auteur: Tan, Hua-Tang; Li, Gao-Xiang
    Sujet: Classical And Quantum Mechanics, General Physics Atomic And Molecular Physicsatoms ; Cavity Resonators ; Energy Levels ; Frequency Mixing ; Quantum Entanglement ; Quantum Mechanics ; Quantum States;
    Description: In this paper, we investigate the generation of polychromatic quadripartite entanglement of continuous variables from a three-level Λ-type atomic system inside an optical quadruply resonant cavity. The atoms are driven by external lasers and simultaneously coupled to four cavity modes by means of multiply concurrent four-wave mixing interactions. The general master equation of the cavity field is derived explicitly. By solving the Gaussian-type master equation and using the negative-partial-transpose criterion for bipartite entanglement, we show that the genuine quadripartite entanglement of the field can be generated over a wide range of parameters. The entanglement properties of the four-mode field are discussed in detail. We find that the optimal quadripartite entanglement can be obtained when the cavity modes are tuned to be resonant with the Rabi sidebands of the driven atoms. Journal Article.
    Fait partie de: Physical Review A, 9/2010, Vol.82(3)
    Identifiant: 1050-2947 (ISSN); 1094-1622 (E-ISSN); http (DOI)