Chin. Phys. Lett.  2012, Vol. 29 Issue (6): 060305    DOI: 10.1088/0256-307X/29/6/060305
GENERAL |
Quantum Discord and Entanglement in Heisenberg XXZ Spin Chain after Quenches
REN Jie**, WU Yin-Zhong, ZHU Shi-Qun
1Department of Physics and Jiangsu Laboratory of Advanced Functional Material, Changshu Institute of Technology, Changshu 215500
2School of Physical Science and Technology, Soochow University, Suzhou, Jiangsu 215006
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REN Jie, WU Yin-Zhong, ZHU Shi-Qun 2012 Chin. Phys. Lett. 29 060305
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Abstract Using the adaptive time-dependent density-matrix renormalization group method, the dynamics of entanglement and quantum discord of an one-dimensional spin-1/2 XXZ chain is studied when anisotropic interaction quenches are applied at different temperatures. The dynamics of the quantum discord and pairwise entanglement between the nearest qubits shows that the entanglement and quantum discord will first oscillate and then approach to a constant value. The quantum discord can be used to predict the quantum phase transition, while the entanglement cannot.
Received: 13 March 2012      Published: 31 May 2012
PACS:  03.65.Yz (Decoherence; open systems; quantum statistical methods)  
  03.65.Ud (Entanglement and quantum nonlocality)  
  03.67.Bg (Entanglement production and manipulation)  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/29/6/060305       OR      https://cpl.iphy.ac.cn/Y2012/V29/I6/060305
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REN Jie
WU Yin-Zhong
ZHU Shi-Qun
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