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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
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摘要: 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．Abstract: 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.
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