Quantum speed limit time of a non-Hermitian two-level system

doi:10.1088/1674-1056/ab6c45

中国物理B ›› 2020, Vol. 29 ›› Issue (3): 30304-030304.doi: 10.1088/1674-1056/ab6c45

• SPECIAL TOPIC—Recent advances in thermoelectric materials and devices • 上一篇下一篇

Quantum speed limit time of a non-Hermitian two-level system

Yan-Yi Wang(王彦懿), Mao-Fa Fang(方卯发)

Synergetic Innovation Center for Quantum Effects and Application, and Key Laboratory of Low-dimensional Quantum Structures and Quantum Control of Ministry of Education, School of Physics and Electronics, Hunan Normal University, Changsha 410081, China

收稿日期:2019-11-03 修回日期:2020-01-05 出版日期:2020-03-05 发布日期:2020-03-05
通讯作者: Mao-Fa Fang E-mail:mffang@hunnu.edu.cn

Quantum speed limit time of a non-Hermitian two-level system

Yan-Yi Wang(王彦懿), Mao-Fa Fang(方卯发)

Synergetic Innovation Center for Quantum Effects and Application, and Key Laboratory of Low-dimensional Quantum Structures and Quantum Control of Ministry of Education, School of Physics and Electronics, Hunan Normal University, Changsha 410081, China

Received:2019-11-03 Revised:2020-01-05 Online:2020-03-05 Published:2020-03-05
Contact: Mao-Fa Fang E-mail:mffang@hunnu.edu.cn

摘要/Abstract

摘要： We investigated the quantum speed limit time of a non-Hermitian two-level system for which gain and loss of energy or amplitude are present. Our results show that, with respect to two distinguishable states of the non-Hermitian system, the evolutionary time does not have a nonzero lower bound. The quantum evolution of the system can be effectively accelerated by adjusting the non-Hermitian parameter, as well as the quantum speed limit time can be arbitrarily small even be zero.

关键词: quantum speed limit time, non-Hermitian dynamics, quantum optics

Abstract: We investigated the quantum speed limit time of a non-Hermitian two-level system for which gain and loss of energy or amplitude are present. Our results show that, with respect to two distinguishable states of the non-Hermitian system, the evolutionary time does not have a nonzero lower bound. The quantum evolution of the system can be effectively accelerated by adjusting the non-Hermitian parameter, as well as the quantum speed limit time can be arbitrarily small even be zero.

Key words: quantum speed limit time, non-Hermitian dynamics, quantum optics

中图分类号: (Quantum information)

03.67.-a

42.50.-p (Quantum optics) 03.67.Lx (Quantum computation architectures and implementations)

王彦懿, 方卯发. Quantum speed limit time of a non-Hermitian two-level system[J]. 中国物理B, 2020, 29(3): 30304-030304.

Yan-Yi Wang(王彦懿), Mao-Fa Fang(方卯发). Quantum speed limit time of a non-Hermitian two-level system[J]. Chin. Phys. B, 2020, 29(3): 30304-030304.

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Quantum speed limit time of a non-Hermitian two-level system

Quantum speed limit time of a non-Hermitian two-level system

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