中国物理B ›› 2021, Vol. 30 ›› Issue (7): 70303-070303.doi: 10.1088/1674-1056/abe1a9

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Steered coherence and entanglement in the Heisenberg XX chain under twisted boundary conditions

Yu-Hang Sun(孙宇航) and Yu-Xia Xie(谢玉霞)   

  1. School of Science, Xi'an University of Posts and Telecommunications, Xi'an 710121, China
  • 收稿日期:2020-10-31 修回日期:2021-01-08 接受日期:2021-02-01 出版日期:2021-06-22 发布日期:2021-06-22
  • 通讯作者: Yu-Xia Xie E-mail:yuxia1124@163.com
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 11675129).

Steered coherence and entanglement in the Heisenberg XX chain under twisted boundary conditions

Yu-Hang Sun(孙宇航) and Yu-Xia Xie(谢玉霞)   

  1. School of Science, Xi'an University of Posts and Telecommunications, Xi'an 710121, China
  • Received:2020-10-31 Revised:2021-01-08 Accepted:2021-02-01 Online:2021-06-22 Published:2021-06-22
  • Contact: Yu-Xia Xie E-mail:yuxia1124@163.com
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 11675129).

摘要: We study steered coherence (SC) and entanglement in a three-spin Heisenberg XX model under twisted boundary conditions and show that their strengths can be significantly enhanced by tuning the twist angle. The optimal twist angle θopt for achieving the maximum l1 norm of SC is π in the region of weak field B and decreases gradually from π to 0 when B increases after a critical value, while for the relative entropy of SC, θopt equals π in the weak field region and 0 otherwise. The entanglement and the critical temperature above which the entanglement vanishes can also be significantly enhanced by tuning the twist angle from 0 to π.

关键词: quantum coherence, entanglement, twisted boundary conditions

Abstract: We study steered coherence (SC) and entanglement in a three-spin Heisenberg XX model under twisted boundary conditions and show that their strengths can be significantly enhanced by tuning the twist angle. The optimal twist angle θopt for achieving the maximum l1 norm of SC is π in the region of weak field B and decreases gradually from π to 0 when B increases after a critical value, while for the relative entropy of SC, θopt equals π in the weak field region and 0 otherwise. The entanglement and the critical temperature above which the entanglement vanishes can also be significantly enhanced by tuning the twist angle from 0 to π.

Key words: quantum coherence, entanglement, twisted boundary conditions

中图分类号:  (Decoherence; open systems; quantum statistical methods)

  • 03.65.Yz
64.70.Tg (Quantum phase transitions) 75.10.Pq (Spin chain models)