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

作　　者：张剑 邵彬 邹健 

机构地区：[1]Department of Physics,School of Sciences,Beijing Institute of Technology

出　　处：《Chinese Physics B》2009年第12期5179-5188,共10页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant No 10374007)

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.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.

关 键 词：ENTANGLEMENT intrinsic decoherence two-atom two-mode Raman coupled model 

分 类 号：O431.2[机械工程—光学工程] P641.2[理学—光学]