Tavis-Cummings模型中原子运动时三体纠缠量的演化特性

The Evolution Property of Three-body Entanglement Measure in Tavis-Cummings Model with Atomic Motion

用全量子理论研究了原子运动时两纠缠二能级原子与单模真空场相互作用体系的纠缠特性。研究结果表明:当双原子初始处在EPR态时,三体纠缠量最大值与理想W纠缠态纠缠量相同。场模结构参数p影响三体纠缠量随时间演化的振荡特性,随着p值的逐渐增大,三体纠缠量的平均值将越来越小,体系三体纠缠态也会逐渐趋于消纠缠状态。

In light of quantum theory, we investigate the entanglement properties of two entangled two-level atoms that interact resonantly with a single-mode vacuum field with atomic motion. The results show that if the two atoms are prepared in maximun entangled （EPR） state initially, the maximum of three-body entanglement measure is equated with the perfect three-body W entangled state. The parameter of field-mode structure p influences the time evolution osciuation property of three-body entlinglement measure, with the gradually increasing of p, the average of three-body entanglement state will tend to disentangled state inch by inch.