Tavis-Cummings模型中耦合双原子纠缠度的演化特性

主要考虑Tavis-Cumm ings(T-C)模型中有偶极-偶极相互作用的双原子和单模相干光场相互作用时原子间的纠缠演化规律.文章给出了模型中系统时间演化算符的具体形式,并且给出了两原子初始均处于基态时不同耦合程度下原子之间的纠缠演化曲线和原子布居差演化曲线,发现原子之间始终是纠缠的,纠缠度随时间作周期性振荡,振荡幅度和周期都与原子间的耦合强度密切相关,同时原子间纠缠度的演化与原子布居差的坍塌-恢复有关联.

Evolution Properties of Entanglement of Two Coupling Atoms in Tavis-Cummings Model

Atomic evolution properties of entanglement are represented by concurrence,and the effects of atoms-coupling on the properties are considered within the context of the Tavis-Cummings model.Two coupling two-level atoms interact with a quantized cavity field,and the explicit forms of the evolution operator are given.It is found that atomic entanglement can always be kept though atoms are initially unentangled.The results also show that the amplitude of the entanglement evolution oscillation increases,and the periods of the oscillation become longer with increasing atomic coupling effect.When atomic coupling is strong enough,atomic entanglement evolution behavior is similar to that of the Heisenberg model.Atomic entanglement evolution properties have relations with atomic population.