摘要
文中利用共生纠缠度研究了双光子Jaynes Cummings模型中原子与腔纠缠的时间演化和有限温度下系统热纠缠态。结果表明 ,腔场中原子与腔展现出周期性的纠缠演化过程 ,演化周期随原子与腔耦合强度的增大而减小 ;在有限温度下 ,系统的共生纠缠度随温度的升高而降低 ,当趋近临界温度时 ,系统纠缠现象消失 ,这一临界温度值与原子 腔耦合强度成正比。对于典型的实验数据 ,临界温度大约在～ 10 -5K数量级。
We investigate atom-cavity entanglement in the time evolution and the thermal entanglement in two-photon Jaynes-Cummings model by means of concurrence. The result shows that atom-cavity entangled state appears with periodicity, which decreases with the increasing coupling strength between the atom and cavity; In finite temperature, the concurrence decreases with the increasing of temperature, thermal entanglement vanishes in this Jaynes-Cummings model when system temperature reaches the critical temperature, which is proportional to the coupling strength of atom-cavity. For typical experimental data, the critical temperature is on the order of 10^(-5) K.
出处
《原子与分子物理学报》
CAS
CSCD
北大核心
2004年第1期68-72,共5页
Journal of Atomic and Molecular Physics
基金
湖南省教育厅青年科研项目 (99B2 7)
