%0 Journal Article
%T Time evolution of two-atom entanglement and thermal entanglement in a generalized Jaynes-Cummings model<br>推广的Jaynes-Cummings模型中原子纠缠的时间演化和热纠缠态
%A Xiang Shao-Hu
%A Yang Xiong
%A Song Ke-Hui
%A <br>向少华
%A 杨 雄
%A 宋克慧
%J 物理学报
%D 2004
%I 
%X In this paper, we investigate two-atom entanglement in time evolution and the thermal entanglement in a generalized Jaynes-Cummings model by means of concurrence. The result shows that the two-atom entangled state appears with periodicity, which decreases with increasing dipole-dipole coupling between the two atoms. In a finite temperature, the concurrence decreases with increasing temperature, and the thermal entanglement vanishes in this Jaynes-Cummings model when the system temperature reaches the critical temperature, which is proportional to the dipole-dipole coupling strength of the two atoms. For typical experimental data, the critical temperature is on the order of 10 -5K. In addition, there exists the quantum phase transition in this Jaynes-Cummings model.
%K Jaynes-Cummings model
%K atomic entanglement
%K thermal entanglement
%K concurrence
%K dipole-dipole interaction<br>Jaynes-Cummings模型
%K 原子纠缠态
%K 热纠缠态
%K 共生纠缠度
%K 量子力学
%K 偶极-偶极相互作用
%K 时间演化
%K 临界温度
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=80A438494835E8D6&yid=D0E58B75BFD8E51C&vid=8E6AB9C3EBAAE921&iid=94C357A881DFC066&sid=80AD5907B47936EE&eid=9438DF4A1CE63979&journal_id=1000-3290&journal_name=物理学报&referenced_num=7&reference_num=23