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

胡要花

洛阳师范学院物理与电子信息学院,洛阳,471022

通讯作者: 胡要花

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

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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，两原子长时问地纠缠．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．

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Abstract: 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.

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

通讯作者: 胡要花

洛阳师范学院物理与电子信息学院,洛阳,471022

关键词:

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

Corresponding author:

洛阳师范学院物理与电子信息学院,洛阳,471022

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