原子与耦合腔相互作用系统中的纠缠特性

研究了耦合腔A和B中各囚禁一个二能级原子的情况,给出了总激发数为2时系统态矢的演化.利用Negativity熵度量两子系统间的纠缠,采用数值计算方法研究了两个原子之间、腔内原子与腔场之间和两个腔场之间的纠缠性质.讨论了腔场间的耦合强度对纠缠特性的影响.研究结果表明:原子1和原子2处于分离态.另一方面,随腔场间耦合系数增大腔场间的纠缠和原子与腔场间的纠缠减小.

Entanglement Properties in the System of two Atoms Trapped in Coupled Cavities

The two-excitation system comprising two two-level atoms resonantly interacting with two coupled cavities is analyzed. The evolution of the state vector of the system is given when the total excitation number equals two. By means of the numerical calculations, the temporal evolution in the entanglement is investigated between the atoms, between the cavities, as well as between the atom and the local cavity mode. The influences of coupling constant between cavities on the entanglements are discussed. The results obtained show that atom and atom are separable, and the cavity-cavity entanglement and the atom-cavity entanglement are weakened with increasing of the coupling constant between cavities.