Sudden Transition in Quantum Discord Dynamics:Role of Three-Site Interaction  

作　　者：TIAN Li-Jun ZHANG Cai-Yun QIN Li-Guo 田立君;张彩云;秦立国(Department of Physics,Shanghai University,Shanghai 200444;Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201210)

机构地区：[1]Department of Physics,Shanghai University,Shanghai 200444 [2]Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201210

出　　处：《Chinese Physics Letters》2013年第5期10-13,共4页中国物理快报（英文版）

基　　金：the National Natural Science Foundation of China under Grant No 11075101.

摘　　要：We investigate the dynamics of quantum discord for a two-qubit system coupled to a spin chain with three-site interaction in the weak-coupling region.For the case of the initial two-qubit pure state,the decay of quantum discord can be delayed in a special interval of the three-site coupling strength.In the absence of the transverse field,with the increase of three-site interaction,quantum discord tends to be stabler.For the case of the initial mixed state,the increase of quantum discord is delayed in the special interval of three-site interaction.In addition,a sudden transition between classical and quantum decoherence is also observed,with the transition time determined by the three-site interaction and degree of anisotropy.

关 键 词：INTERACTION QUANTUM INTERACTION 

分 类 号：O41[理学—理论物理]