中国物理B ›› 2022, Vol. 31 ›› Issue (9): 90301-090301.doi: 10.1088/1674-1056/ac67c3

• •    下一篇

Characterizing entanglement in non-Hermitian chaotic systems via out-of-time ordered correlators

Kai-Qian Huang(黄恺芊)1, Wei-Lin Li(李蔚琳)1, Wen-Lei Zhao(赵文垒)2,†, and Zhi Li(李志)1,3,4,‡   

  1. 1 Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, SPTE, South China Normal University, Guangzhou 510006, China;
    2 School of Science, Jiangxi University of Science and Technology, Ganzhou 341000, China;
    3 Guangdong-Hong Kong Joint Laboratory of Quantum Matter, Frontier Research Institute for Physics, South China Normal University, Guangzhou 510006, China;
    4 Guangdong Provincial Key Laboratory of Nuclear Science, Institute of Quantum Matter, South China Normal University, Guangzhou 510006, China
  • 收稿日期:2022-02-17 修回日期:2022-04-06 接受日期:2022-04-18 出版日期:2022-08-19 发布日期:2022-08-19
  • 通讯作者: Wen-Lei Zhao, Zhi Li E-mail:wlzhao@jxust.edu.cn;lizphys@m.scnu.edu.cn
  • 基金资助:
    W. Zhao was supported by the National Natural Science Foundation of China (Grant No. 12065009) and Science and Technology Planning Project of Ganzhou City (Grant No. 202101095077). K. Q. Huang and Z. Li were supported by the National Natural Science Foundation of China (Grant Nos. 11704132, 11874017, and U1830111), the Natural Science Foundation of Guangdong Province, China (Grant No. 2021A1515012350), and the KPST of Guangzhou (Grant No. 201804020055).

Characterizing entanglement in non-Hermitian chaotic systems via out-of-time ordered correlators

Kai-Qian Huang(黄恺芊)1, Wei-Lin Li(李蔚琳)1, Wen-Lei Zhao(赵文垒)2,†, and Zhi Li(李志)1,3,4,‡   

  1. 1 Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, SPTE, South China Normal University, Guangzhou 510006, China;
    2 School of Science, Jiangxi University of Science and Technology, Ganzhou 341000, China;
    3 Guangdong-Hong Kong Joint Laboratory of Quantum Matter, Frontier Research Institute for Physics, South China Normal University, Guangzhou 510006, China;
    4 Guangdong Provincial Key Laboratory of Nuclear Science, Institute of Quantum Matter, South China Normal University, Guangzhou 510006, China
  • Received:2022-02-17 Revised:2022-04-06 Accepted:2022-04-18 Online:2022-08-19 Published:2022-08-19
  • Contact: Wen-Lei Zhao, Zhi Li E-mail:wlzhao@jxust.edu.cn;lizphys@m.scnu.edu.cn
  • Supported by:
    W. Zhao was supported by the National Natural Science Foundation of China (Grant No. 12065009) and Science and Technology Planning Project of Ganzhou City (Grant No. 202101095077). K. Q. Huang and Z. Li were supported by the National Natural Science Foundation of China (Grant Nos. 11704132, 11874017, and U1830111), the Natural Science Foundation of Guangdong Province, China (Grant No. 2021A1515012350), and the KPST of Guangzhou (Grant No. 201804020055).

摘要: We investigate the quantum entanglement in a non-Hermitian kicking system. In the Hermitian case, the out-of-time ordered correlators (OTOCs) exhibit the unbounded power-law increase with time. Correspondingly, the linear entropy, which is a common measurement of entanglement, rapidly increases from zero to almost unity, indicating the formation of quantum entanglement. For strong enough non-Hermitian driving, both the OTOCs and linear entropy rapidly saturate as time evolves. Interestingly, with the increase of non-Hermitian kicking strength, the long-time averaged value of both OTOCs and linear entropy has the same transition point where they exhibit the sharp decrease from a plateau, demonstrating the disentanglment. We reveal the mechanism of disentanglement with the extension of Floquet theory to non-Hermitian systems.

关键词: out-of-time ordered correlators, quantum entanglement, non-Hermiticity

Abstract: We investigate the quantum entanglement in a non-Hermitian kicking system. In the Hermitian case, the out-of-time ordered correlators (OTOCs) exhibit the unbounded power-law increase with time. Correspondingly, the linear entropy, which is a common measurement of entanglement, rapidly increases from zero to almost unity, indicating the formation of quantum entanglement. For strong enough non-Hermitian driving, both the OTOCs and linear entropy rapidly saturate as time evolves. Interestingly, with the increase of non-Hermitian kicking strength, the long-time averaged value of both OTOCs and linear entropy has the same transition point where they exhibit the sharp decrease from a plateau, demonstrating the disentanglment. We reveal the mechanism of disentanglement with the extension of Floquet theory to non-Hermitian systems.

Key words: out-of-time ordered correlators, quantum entanglement, non-Hermiticity

中图分类号:  (Quantum mechanics)

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