耦合腔场中原子共生纠缠对的研究

The Study on the Atomic Concurrence in the Coupled Cavities

研究了耦合腔场模型下原子纠缠与光腔场纠缠的演化与转移问题。发现在不同Bell型初态下,光腔场间耦合参数对初始纠缠的演化行为起到了不同的作用。对第一类Bell态cosθ|e,e〉+sinθ|g,g〉,调节腔场间耦合参数既可以起到延长原子纠缠死亡时间的作用,又可以起到保护初始原子纠缠的效果。而对第二类Bell态cosθ|e,g〉+sinθ|g,e〉,腔场耦合参数对原子间初始纠缠只起到保护作用。

In this paper, the dynamics evolution and transfer of the atomic concurrence and the cavities concurrence are investigated in the coupled-cavity model. The results show that the coupling coefficient between two cavities plays different roles on evolutional behaviors for the initial entanglement in the different Bell states. In the case of the first Bell state cosθ｜e,e〉＋sinθ｜g,g〉 , the coupling coefficient between two cavities not only can prolong the time of entanglement death, but also can preserve the initial atomic entanglement. While for the case of the other Bell state coefficient between two cavities only can give a protection for the initia cosθ｜e,g〉＋sinθ｜g,e〉, the coupling atomic entanglement.