三能级原子与耦合腔相互作用系统中的纠缠特性

The entanglement properties in the system of a two three-level atoms trapped in coupled cavities

采用Negativity熵来度量两个子系统间的纠缠,利用数值计算方法研究了简并A型三能级原子和简并V型三能级原子与耦合腔共振相互作用系统中原子之间、腔场之间和原子与腔场间的纠缠性.给出了系统初始激发数为1时系统态矢的演化公式;讨论了腔场间的耦合系数变化对纠缠特性的影响.研究结果表明:随腔场间的耦合系数增大,原子间的纠缠增强,腔场间的纠缠减弱.

We study the entanglement dynamics of the system composed of a A-type atom and a V-type atom resonantly interacting with two coupled cavities.The evolution of the state vector of the system is given.We investigate the evolutions of atom-atom entanglement, cavity-cavity entanglement,and atom-cavity entanglement by Negativity.The influences of cavity-cavity coupling coefficient on the entanglements are discussed.The results obtained by the numerical method show that the atom-atom entanglement is strengthened and the cavity-cavity entanglement is weakened with the increase of the cavity-cavity coupling coefficient.