三耦合腔系统双光子过程中的纠缠特性

Entanglement Properties of Two-Photon Process in Three Coupling Cavities

研究腔与腔之间通过双光子过程耦合的三耦合腔系统,考虑每个腔囚禁一个二能级原子,并且原子通过双光子跃迁过程与腔场共振相互作用的情况。采用负本征值来度量两个子系统间的纠缠,利用数值计算方法研究了系统中两个子系统间的纠缠动力学特性。讨论了腔场间耦合系数变化对两个子系统间纠缠特性的影响。研究发现,随腔场间耦合系数的增大,两原子间的纠缠增强,两腔场间的纠缠减弱。

Three identical cavities are considered each of which contains one two-level atom with the two cavities coupled via a two-photon hopping interaction.Negativity is used to quantify the degree of entanglement.By means of the numerical calculations,the evolution of the entanglement between atoms or between cavities has been investigated.The influence of cavity-cavity coupling coefficient on the entanglement is discussed.The results show that the entanglement between atoms is strengthened,and that between cavities is weakened with cavity-cavity coupling coefficient increasing.