Anomalous Temperature Effects of the Entanglement of Two Coupled Qubits in Independent Environments  

作　　者：SHAN Chuan-Jia CAO Shuai XUE Zheng-Yuan ZHU Shi-Liang 单传家;曹帅;薛正远;朱诗亮(Laboratory of Quantum Information Technology and SPTE,South China Normal University,Guangzhou 510006;College of Physics and Electronic Science,Hubei Normal University,Huangshi 435002)

机构地区：[1]Laboratory of Quantum Information Technology and SPTE,South China Normal University,Guangzhou 510006 [2]College of Physics and Electronic Science,Hubei Normal University,Huangshi 435002

出　　处：《Chinese Physics Letters》2012年第4期7-10,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos 11004065 and 11105049;Educational Com-mission of Hubei Province under Grant Nos Q20112501 and 2010C20.

摘　　要：We investigate the entanglement dynamical behavior of two coupled qubits via a Heisenberg XX interaction,which are connected with two independent finite temperature heat baths.By numerical simulations of the quantum master equation,it is found that the interesting phenomena of entanglement sudden death (ESD) as well as sudden birth (ESB) appear during the evolution process for particular initial states.We also show that two critical temperatures T1 (determining that the quantum state is entangled or separable) and T2 (where maximal stationary entanglement can be observed) exist,and stationary entanglement exhibits a non-monotonic behavior as a function of the finite temperature noise strength.These results enlarge the domain of the reasonable experimental temperature where stationary entanglement can be observable.

关 键 词：STATIONARY QUANTUM INDEPENDENT 

分 类 号：O41[理学—理论物理]