光子禁带中原子间距对三原子间纠缠演化特性的影响

Effect of Interatomic Distance in Photonic Band Gapon Entanglement Evolution Property Among Three Atoms

研究了光子禁带模型中三个二能级原子与热库发生相互作用的系统纠缠动力学演化。采用赝模理论和三体负本征值方法描述了系统间的纠缠,通过数值计算分析了热库谱密度函数、原子与赝模间的失谐量以及原子间的偶极-偶极相互作用强度对三原子间纠缠演化的影响。结果表明,在完美带隙模型中,原子间的纠缠随时间的演化会出现俘获现象;原子与赝模间的失谐量使原子间纠缠呈现出非单调性的变化;通过增加原子间距可以提升三原子间的纠缠。

In the model of photonic band gap,the entanglement dynamical evolution of a system where three two-level atoms interact with a heat reservoir is investigated.The entanglement among systems is described by using the pseudo-mode theory and the tripartite negative eigenvalue method.The effects of the heat-reservoir spectral density function,the detuning between the atoms and pseudo modes,and the interatomic dipole-dipole interaction strength on the three-atom entanglement evolution are analyzed by means of numerical calculation.The results show that in a perfect band gap model,the trapping phenomenon appears in the interatomic entanglement evolution versus time.The detuning between the atoms and pseudo modes makes the interatomic entanglement show a non-monotonic transition.The three-atom entanglement degree increases with the increase of the interatomic distance.