Λ型和V型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 composed of a Λ-type atom and a V-type atom trapped in two distant cavities connected by an optical fiber

研究了由一个Λ型三能级原子、一个V型三能级原子和光纤连接的双模腔构成的系统,给出了系统态矢的演化.采用部分转置密度矩阵的负本征值来描述两个子系统间的纠缠,利用数值计算方法研究了原子与原子之间和腔场与腔场之间的纠缠特性.讨论了光纤模与腔场间的耦合强度对纠缠特性的影响.研究结果表明:随光纤模与腔场间的耦合强度增强,原子间的纠缠和腔场间的纠缠均增强.

We consider a system consisting of a Λ-type atom and a V-type atom,which are individually trapped in two spatially separated cavities that are connected by an optical fiber.The evolution of the state vector of the system is given.We investigate the temporal evolution in the entanglement between atoms and that between cavities.We discuss the influence of cavity-fiber coupling coefficient on entanglement.The results obtained by the numerical method show that the entanglement between atoms and the entanglement between cavities have the same evolution regularities.On the other hand,the entanglement between atoms and that between cavities are strengthened with the increase of cavity-fiber coupling coefficient.