摘要
本文研究将三个二能级原子分别囚禁在耦合腔A,B和C中,腔中原子与腔场发生共振相互作用的情况.采用Negativity熵度量两子系统问的纠缠,通过数值计算给出了两个原子之间和两个腔场之问的纠缠演化.讨论了腔场间的耦合强度对纠缠特性的影响.研究结果表明:原子间的纠缠与腔场间的耦合系数问存在非线性关系.另一方面,相邻腔场腔A和腔B间,以及腔B和腔C间的纠缠随腔场间的耦合系数增大而减弱,但非相邻腔场腔A和腔C间的纠缠却随腔场间的耦合系数增大而增强.
The entanglement dynamics of the system composed of three two-level atoms resonantly interacting with three coupled cavities is investigated in this paper.The influence of coupling constant between cavities on the entanglement between atoms and that between cavities are discussed.The results obtained using the numerical method show that the entanglement between atoms has a nonlinear relation with increase of the cavity-cavity coupling coefficient.On the other hand,the entanglement between cavity A and cavity B and the entanglement between cavity B and cavity C weaken with the increase of the coupling constant between cavities,but the entanglement between cavity A and cavity C strengthens with the increase of cavity-cavity coupling coefficient.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2012年第15期31-38,共8页
Acta Physica Sinica
基金
福建省自然科学基金(批准号:2011J01018)资助的课题~~
关键词
量子光学
二能级原子
耦合腔
量子纠缠
quantum optics； two-level atom； coupling cavities； quantum entanglement
