腔耦合双J-C模型中原子纠缠的猝灭和猝生

Sudden death and sudden birth of atomic entanglement in double Jaynes-Cummings model composed of two coupled cavities

研究了腔间有耦合的双J-C模型中原子纠缠的动力学,分析了腔间耦合系数A和原子的初态对原子纠缠的猝灭(ESD)和猝生(ESB)的影响。通过对原子间共生纠缠度的数值分析发现,当原子初态为第一类类Bell态时,不会出现ESD和ESB,腔间的耦合可使原子的纠缠加大,并能使初态为分离态的原子产生纠缠。当原子初态为第二类类Bell态时,A的大小可改变出现ESD与ESB的时间间隔,或决定是否出现ESD,但腔间的耦合不能使初态不纠缠的原子产生纠缠。

The atomic entanglement dynamics is studied in the double Jaynes-Cummings model composed of two coupled cavities. Effect of the cavity-cavity coupling constant A and the atomic initial states on entanglement sudden death （ESD） and entanglement sudden birth （ESB） is analysed. By studying the atomic concurrence, it was shown that when the atomic initial states are the first kind Bell-like states, ESD and ESB doesn＇t appear, coupling of the cavities can increase the atomic entanglement and entanglement occurs even the initial states are disentangled. When the atomic initial states are the second kind Bell-like states, the time intervals between the ESD and ESB, and whether the ESD occurs or not are controlled by the coupling constant A. The atomic entanglement can＇t be produced by the coupling between the cavities when the atomic initial states are disentangled and in the second kind Bell-like states