Sudden Transition in Quantum Discord Dynamics: Role of Three-Site Interaction
TIAN Li-Jun1** , ZHANG Cai-Yun1 , QIN Li-Guo2
1 Department of Physics, Shanghai University, Shanghai 2004442 Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210
Abstract ：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.
收稿日期: 2013-01-04
出版日期: 2013-05-31
:
03.65.Yz
(Decoherence; open systems; quantum statistical methods)
03.65.Ud
(Entanglement and quantum nonlocality)
75.10.Jm
(Quantized spin models, including quantum spin frustration)
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2013, Vol. 30 
