Stark位移对热环境下双Jaynes-Cummings模型中原子纠缠的影响  

Effect of the Stark shift on entanglement in a double Jaynes-Cummings model in thermal environment

作　　者：胡要花[1] 

机构地区：[1]洛阳师范学院物理与电子信息学院,洛阳471022

出　　处：《物理学报》2012年第16期33-39,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10905028);河南省科技计划(批准号:102300410050)资助的课题~~

摘　　要：研究双光子跃迁的双Jaynes-Cummings模型中,两原子初始处于最大纠缠态、光场初始处于单模热态时的原子纠缠动力学,考虑双光子过程中的Stark位移、热光场的平均光子数对原子纠缠的影响.结果表明:不考虑Stark位移时,两原子在系统演化过程中周期性地出现退纠缠现象,而考虑Stark位移时,两原子长时间地纠缠.特别是当Stark位移参数取值较大且热光场的平均光子数值比较小时,两原子能保持稳定地纠缠.这些结果表明,可以利用Stark位移对热环境下双Jaynes-Cummings模型中的原子纠缠进行调控.Considering a double two-photon Jaynes-Cummings （J-C） model, we study the effects of Stark shift and mean photon number on entanglement between two two-level atoms when the atoms are initially in a maximally entangled state and the fields are in the single-mode thermal fields. The results show that the two atoms evolve periodically into a disentangled separable state when Stark shift is not considered. However, in the presence of Stark shift, the two two-level atoms are no longer disentangled and long-lived entanglement can be obtained. For a larger value of the Stark shift parameter and a smaller mean photon number, the two atoms can remain in a stationary entangled state. These properties show that the Stark shift can be used to control entanglement in the double two-photon J-C model under the influence of thermal environment.

关 键 词：双Jaynes—Cummings模型 单模热光场 STARK位移 纠缠 

分 类 号：O431.2[机械工程—光学工程]