中国物理B ›› 2010, Vol. 19 ›› Issue (11): 110304-110309.doi: 10.1088/1674-1056/19/11/110304

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Entanglement dynamics of two distant atoms in two detuning cavities

吕天全1, 计新2, 张寿2   

  1. (1)Center for the Condensed-Matter Science and Technology, Department of Physics, Harbin Institute of Technology, Harbin 150001, China; (2)Center for the Condensed-Matter Science and Technology, Department of Physics, Harbin Institute of Technology, Harbin 150001, China; Department of Physics, College of Science, Yanbian University, Yanji 133002, China
  • 收稿日期:2010-01-06 修回日期:2010-06-11 出版日期:2010-11-15 发布日期:2010-11-15
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 60667001).

Entanglement dynamics of two distant atoms in two detuning cavities

Ji Xin(计新)a)b)†, Lü Tian-Quan(吕天全)a), and Zhang Shou(张寿)a)b)‡   

  1. a Center for the Condensed-Matter Science and Technology, Department of Physics, Harbin Institute of Technology, Harbin 150001, China; b Department of Physics, College of Science, Yanbian University, Yanji 133002, China
  • Received:2010-01-06 Revised:2010-06-11 Online:2010-11-15 Published:2010-11-15
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 60667001).

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摘要： We investigate the entanglement dynamics via the concurrence of two distant atoms interacting off-resonantly with two cavity fields in Fock states, respectively. We find that the evolution of entanglement has sudden death and sudden birth phenomena, that with the increase of photon numbers in the two cavities, the alternate frequency of sudden death and sudden birth turns fast, and that the amplitude of concurrence oscillates regularly with oscillation frequency becoming slow when the cavity fields have the same photon numbers. While, the maximum of concurrence declines and the amplitude of concurrence oscillates irregularly when the two cavity fields have different photon numbers. In addition, we find the length of death time is dependent on the initial entanglement.

Abstract: We investigate the entanglement dynamics via the concurrence of two distant atoms interacting off-resonantly with two cavity fields in Fock states, respectively. We find that the evolution of entanglement has sudden death and sudden birth phenomena, that with the increase of photon numbers in the two cavities, the alternate frequency of sudden death and sudden birth turns fast, and that the amplitude of concurrence oscillates regularly with oscillation frequency becoming slow when the cavity fields have the same photon numbers. While, the maximum of concurrence declines and the amplitude of concurrence oscillates irregularly when the two cavity fields have different photon numbers. In addition, we find the length of death time is dependent on the initial entanglement.

Key words: entanglement dynamics, interacting off-resonantly, Fock state, sudden death and sudden birth

中图分类号:  (Entanglement and quantum nonlocality)

  • 03.65.Ud
37.10.Vz (Mechanical effects of light on atoms, molecules, and ions) 42.50.Dv (Quantum state engineering and measurements)