Decoherence Effect in An Anisotropic Two-Qubit Heisenberg XYZ Model with Inhomogeneous Magnetic Field  

作　　者：陈涛 单传家 李金星 刘继兵 刘堂昆 黄燕霞 

机构地区：[1]College of Physics and Electronic Science, Hubei Normal University

出　　处：《Communications in Theoretical Physics》2010年第6期1053-1058,共6页理论物理通讯（英文版）

基　　金：Supported by National Natural Science Foundation of China under Grant No.10904033;Natural Science Foundation of Hubei Province under Grant No.2009CDA145;Educational Commission of Hubei Province under Grant No.D20092204;Natural Science Foundation of Hubei Normal University under Grant No.2007D21

摘　　要：Taking the decoherence effect into account, the entanglement evolution of a two-qubit anisotropic Heisenberg XYZ chain in the presence of inhomogeneous magnetic field is investigated. The time evolution of concurrence is studied for the initial state cos θ｜01） ＋ sin θ｜10） at zero temperature. The influences of inhomogeneous magnetic field, anisotropic parameter and decoherence on entanglement dynamic are addressed in detail, and a concurrence formula of the steady state is found. It is shown that the entanglement sudden death （ESD） and entanglement sudden birth （ESB） appear with the decoherence effect, and the stable concurrence depends on the uniform magnetic field B, anisotropic parameter △ and environment coupling strength γ, which is independent of different initial states and nonuniform magnetic field b.

关 键 词：Heisenberg model thermal entanglement CONCURRENCE DECOHERENCE inhomogeneous magneticfield 

分 类 号：O413[理学—理论物理]