中国物理B ›› 2017, Vol. 26 ›› Issue (10): 100501-100501.doi: 10.1088/1674-1056/26/10/100501

• GENERAL • 上一篇    下一篇

Quantum correlations dynamics of three-qubit states coupled to an XY spin chain:Role of coupling strengths

Shao-Ying Yin(尹少英), Qing-Xin Liu(刘庆欣), Jie Song(宋杰), Xue-Xin Xu(许学新), Ke-Ya Zhou(周可雅), Shu-Tian Liu(刘树田)   

  1. 1. Department of Physics, Harbin Institute of Technology, Harbin 150001, China;
    2. Department of Physics, Harbin University, Harbin 150086, China;
    3. China Mobile Group, Heilongjiang CO. Ltd., Harbin 150001, China
  • 收稿日期:2017-03-20 修回日期:2017-06-09 出版日期:2017-10-05 发布日期:2017-10-05
  • 通讯作者: Shu-Tian Liu E-mail:stliu@hit.edu.cn
  • 基金资助:
    Project supported by National Basic Research Program of China (Grant No. 2013CBA01702) and National Natural Science Foundation of China (Grant Nos. 61377016, 61575055, 10974039, 61307072, 61308017, and 61405056).

Quantum correlations dynamics of three-qubit states coupled to an XY spin chain:Role of coupling strengths

Shao-Ying Yin(尹少英)1,2, Qing-Xin Liu(刘庆欣)3, Jie Song(宋杰)1, Xue-Xin Xu(许学新)1, Ke-Ya Zhou(周可雅)1, Shu-Tian Liu(刘树田)1   

  1. 1. Department of Physics, Harbin Institute of Technology, Harbin 150001, China;
    2. Department of Physics, Harbin University, Harbin 150086, China;
    3. China Mobile Group, Heilongjiang CO. Ltd., Harbin 150001, China
  • Received:2017-03-20 Revised:2017-06-09 Online:2017-10-05 Published:2017-10-05
  • Contact: Shu-Tian Liu E-mail:stliu@hit.edu.cn
  • Supported by:
    Project supported by National Basic Research Program of China (Grant No. 2013CBA01702) and National Natural Science Foundation of China (Grant Nos. 61377016, 61575055, 10974039, 61307072, 61308017, and 61405056).

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摘要： We investigate the prominent impacts of coupling strengths on the evolution of entanglement and quantum discord for a three-qubit system coupled to an XY spin-chain environment. In the case of a pure W state, more robust, even larger nonzero quantum correlations can be obtained by tailoring the coupling strengths between the qubits and the environment. For a mixed state consisting of the GHZ and W states, the dynamics of entanglement and quantum discord can characterize the critical point of quantum phase transition. Remarkably, a large nonzero quantum discord is generally retained, while the nonzero entanglement can only be obtained as the system-environment coupling satisfies certain conditions. We also find that the impact of each qubit's coupling strength on the quantum correlation dynamics strongly depends on the variation schemes of the system-environment couplings.

关键词: quantum phase transition, quantum correlation, tripartite system, XY spin chain

Abstract: We investigate the prominent impacts of coupling strengths on the evolution of entanglement and quantum discord for a three-qubit system coupled to an XY spin-chain environment. In the case of a pure W state, more robust, even larger nonzero quantum correlations can be obtained by tailoring the coupling strengths between the qubits and the environment. For a mixed state consisting of the GHZ and W states, the dynamics of entanglement and quantum discord can characterize the critical point of quantum phase transition. Remarkably, a large nonzero quantum discord is generally retained, while the nonzero entanglement can only be obtained as the system-environment coupling satisfies certain conditions. We also find that the impact of each qubit's coupling strength on the quantum correlation dynamics strongly depends on the variation schemes of the system-environment couplings.

Key words: quantum phase transition, quantum correlation, tripartite system, XY spin chain

中图分类号:  (Quantum phase transitions)

  • 05.30.Rt
03.65.Ud (Entanglement and quantum nonlocality) 03.65.Aa (Quantum systems with finite Hilbert space) 75.10.Pq (Spin chain models)