纠缠Ⅴ-型三能级原子与纠缠双模腔场相互作用的纠缠特性

Entanglement properties of entangled V-type three-level atoms interacting with entangled two-mode cavity fields

针对由一对处于纠缠态的V-型三能级原子与一对处于纠缠态的双模腔场组成的系统,使其中一个原子在合适的时间内与一个腔场发生大失谐相互作用,即纠缠交换,从而实现原子与腔场之间的纠缠。研究了该系统原子熵的演化特性,并运用量子熵理论讨论了失谐量(δ)大小对原子熵演化的影响。结果表明δ的大小对系统熵的最大纠缠度和系统熵的崩塌-回复现象有影响,当δ为0时崩塌-回复现象消失。

For a syetem composed of a pair of V-type three-level atoms in entangled state and a pair of two-mode cavity fields in entangled state,a large detuning interaction between one atom with a cavity field is made to happen during a proper interaction time,so as to realize the entanglement between the atom and the cavity field.The atomic entropy evolution properties of the system are studied,and the influences of the detuning δ on the evolution of atom entropy are discussed by using the quantum entropy theory.The results indicate that δ affects the maximum entanglement value of the entropy and the collapse-recovery phenomenon of atom entropy,and when δ is zero,collapse-recovery phenomenon of atom entropy almost disappears.