不同环境模型下Bell型纠缠态衰退行为的比较

Comparison of entanglement decay between Bell-like states under different environmental models

通过建立三种不同的环境模型(单一热库模型,共同热库模型和独立热库模型),利用赝模理论的方法,分析讨论了初始处于Bell型纠缠态系统的纠缠演化特性.研究发现在单一热库模型中Bell型初始纠缠态cosθ|ee〉+sinθ|gg〉的纠缠保持时间最长,而cosθ|eg〉+sinθ|ge〉态的纠缠演化对具体的环境模型依赖很大;同时对这两种不同类型的Bell型纠缠态在相同环境模型中的纠缠衰退行为进行了比较.

Establishing three different environment models （i.e., single reservoir model, common reservoir model and independent reservoir model）, we investigate the evolutional characteristic of the entangled system initially in Bell-like state by the pseudomode method. Through comparing the entanglement decays under the three different environment models, we find that the entangled Bell-like state cos θ│ee） ＋ sin θ│gg） will be kept in the single reservoir model for a time longer than in the other two models. However, the en- tanglement decay behavior of Bell-like state cos θ│eg） ＋ sin θ│ge） is dependent on the specific environment model. Meanwhile, the comparison of entanglement decay between the above two Bell-like states at the same environment models is performed.