中国物理B ›› 2009, Vol. 18 ›› Issue (12): 5179-5188.doi: 10.1088/1674-1056/18/12/014

• GENERAL • 上一篇    下一篇

Entanglement of two atoms in two-mode Raman coupled model with intrinsic decoherence

张剑, 邵彬, 邹健   

  1. Department of Physics, School of Sciences, Beijing Institute of Technology, Beijing 100081, China
  • 收稿日期:2009-02-21 修回日期:2009-06-08 出版日期:2009-12-20 发布日期:2009-12-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 10374007).

Entanglement of two atoms in two-mode Raman coupled model with intrinsic decoherence

Zhang Jian(张剑)†,Shao Bin(邵彬), and Zou Jian(邹健)   

  1. Department of Physics, School of Sciences, Beijing Institute of Technology, Beijing 100081, China
  • Received:2009-02-21 Revised:2009-06-08 Online:2009-12-20 Published:2009-12-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10374007).

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摘要： Considering intrinsic decoherence, the two-atom two-mode Raman coupled model is investigated in this paper. Utilizing the constants of motion in this model, we obtain the analytic expressions of the density operator of the system for investigating the entanglement of two atoms. The speed of entanglement decay increases with the increasing of the coupling coefficient of one atom. The difference between the oscillation periods when the initial state parameter of atomic subsystem belongs to two intervals becomes smaller with the increasing of the coupling coefficient of one atom. The increasing of the initial photon number of the second field can hasten the vanishing of entanglement of atomic subsystem. The robustness of atomic entanglement against decoherence depends on the interval of the initial state parameter of atomic subsystem.

Abstract: Considering intrinsic decoherence, the two-atom two-mode Raman coupled model is investigated in this paper. Utilizing the constants of motion in this model, we obtain the analytic expressions of the density operator of the system for investigating the entanglement of two atoms. The speed of entanglement decay increases with the increasing of the coupling coefficient of one atom. The difference between the oscillation periods when the initial state parameter of atomic subsystem belongs to two intervals becomes smaller with the increasing of the coupling coefficient of one atom. The increasing of the initial photon number of the second field can hasten the vanishing of entanglement of atomic subsystem. The robustness of atomic entanglement against decoherence depends on the interval of the initial state parameter of atomic subsystem.

Key words: entanglement, intrinsic decoherence, two-atom two-mode Raman coupled model

中图分类号:  (Entanglement and quantum nonlocality)

  • 03.65.Ud
32.80.-t (Photoionization and excitation) 42.50.Dv (Quantum state engineering and measurements)