Frozen Quantum Coherence for a Central Two-Qubit System in a Spin-Chain Environment
Yang Yang1** , An-Min Wang2 , Lian-Zhen Cao1 , Jia-Qiang Zhao1 , Huai-Xin Lu1
1 Shandong Provincial Key Laboratory of Multi-Photon Entanglement and Manipulation, Department of Physics and Optoelectronic Engineering, Weifang University, Weifang 2610612 Department of Modern Physics, University of Science and Technology of China, Hefei 230026
Abstract ：We investigate the dynamics of coherence for a central two-qubit system coupled to an $XY$ spin chain with the Dzyaloshinsky–Moriya interaction. It is found that a sudden transition of coherence exists near the critical point in the weak-coupling case, and an oscillatory envelope appears in the strong-coupling case. In both cases the freezing phenomenon of coherence can be found.
收稿日期: 2018-04-16
出版日期: 2018-07-15
:
03.65.Yz
(Decoherence; open systems; quantum statistical methods)
03.65.Ta
(Foundations of quantum mechanics; measurement theory)
03.65.Ud
(Entanglement and quantum nonlocality)
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2018, Vol. 35 
