%0 Journal Article
%T Controlling entanglement sudden birth and sudden death of two-atom X-states in Tavis-Cummings model<br>控制Tavis-Cummings模型中两原子X态的纠缠突然死亡与突然产生
%A Shan Chuan-Ji
%A Liu Ji-Bing
%A Chen Tao
%A Liu Tang-Kun
%A Huang Yan-Xia
%A Li Hong
%A <br>单传家
%A 刘继兵
%A 陈涛
%A 刘堂昆
%A 黄燕霞
%A 李宏
%J 物理学报
%D 2010
%I 
%X In this paper, we investigate the entanglement dynamics of two entangled two-level atoms with initial X state and dipole-dipole coupling intensity in Tavis-Cummings model. The interesting phenomena of entanglement sudden death as well as sudden birth appear during the evolution process. We analyze in detail the effect of purity of initially entangled state of two atoms, the dipole-dipole coupling intensity between two atoms, and the field in the Fock state on the apparition time of entanglement sudden death and entanglement sudden birth. Furthermore, the conditions for the conversion of entanglement sudden death and entanglement sudden birth can be generalized when the initial entangled state is not pure. The results show that the above system parameters affect the concurrence, entanglement sudden birth and sudden death remarkably, the dipole-dipole coupling intensity affects amplitudes of the concurrence oscillation and leads time interval of the ESD to decrease. With the increasing of the purity, the time of entanglement sudden death and entanglement sudden birth will decrease; it is also notable that invariant and stable entanglement, which can be controlled by different initial states of the atoms, occurs for particular initial X state.
%K entanglement sudden death and sudden birth
%K two-atom X states
%K T-C model<br>纠缠突然死亡与突然产生
%K 两原子X态
%K Tavis-Cummings模型
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=DA045BB2DBC28D1BFF3984D55B5B398D&yid=140ECF96957D60B2&vid=6AC2A205FBB0EF23&iid=F3090AE9B60B7ED1&sid=E0BAF635D419B134&eid=3E54D2384EA31739&journal_id=1000-3290&journal_name=物理学报&referenced_num=0&reference_num=21