两纠缠原子与光场相互作用系统原子的纠缠特性

研究了两纠缠原子与单模相干态光场相互作用系统中原子纠缠度的时间演化特性，运用全量子理论和数值计算的方法，应用Concurrence纠缠度量标准，讨论了原子初始时刻的纠缠状态和光场强度对两原子纠缠度的影响.结果表明：双原子系统初始纠缠度越大，两原子间的纠缠在演化过程中的峰值也越大；随着光场强度的增加，两原子纠缠度的振荡曲线逐渐表现出崩塌-回复现象，周期性也越来越明显.

Entropy properties in the system of two entangled two-level atoms interacting with coherent field

The entanglement time evolution properties of the two atoms in the system of the two identical entangled two-level atoms interacting with coherent field are studied by means of full quantum theory. Using the numerical method, the influence of the initial entanglement of atoms and the intensity of field on the entanglement measure-concurrence is discussed. The results show that the peaks of the concurrence oscillations increase with the increasing of the initial degree of entanglement of two entangled atoms. The oscillation of the concurrence presents collapses and revivals with the increasing of the mean photon number, while its periodicity is more and more evident.