%0 Journal Article
%T On the properties and controlling of thermal entanglement in a two-qubit Heisenberg XY model with external magnetic fields<br>外磁场下XY模型中两量子位热纠缠的性质及其调控研究
%A Du Xiu-Mei
%A Man Zhong-Xiao
%A Xia Yun-Jie
%A <br>杜秀梅
%A 满忠晓
%A 夏云杰
%J 物理学报
%D 2008
%I 
%X We investigate the thermal entanglement of Heisenberg-type coupled two-qubit system in the presence of two controllable magnetic fields (B+b) and (B-b). We find that under the condition of low temperature and uniform magnetic field, the entanglement between the two qubits exhibits platform-like behavior. By controlling the inhomogeneous magnetic field b and selecting suitable material we can optimize the thermal entanglement and enhance the critical temperature Tc of dead entanglement. We also find that the entanglement switch can be realized in a broader region of temperature by modulating the uniform field B.
%K thermal entanglement
%K density matrix
%K XY model<br>热纠缠度，
%K 密度矩阵，
%K XY模型
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=1FE25A0340641673782C213A52073595&yid=67289AFF6305E306&vid=11B4E5CC8CDD3201&iid=59906B3B2830C2C5&sid=AAD6A047D035E987&eid=94DA82037B6F56A6&journal_id=1000-3290&journal_name=物理学报&referenced_num=0&reference_num=0