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Chin. Phys. B, 2020, Vol. 29(3): 030304    DOI: 10.1088/1674-1056/ab6c45
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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
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.
Keywords:  quantum speed limit time      non-Hermitian dynamics      quantum optics  
Received:  03 November 2019      Revised:  05 January 2020      Accepted manuscript online: 
PACS:  03.67.-a (Quantum information)  
  42.50.-p (Quantum optics)  
  03.67.Lx (Quantum computation architectures and implementations)  
Corresponding Authors:  Mao-Fa Fang     E-mail:  mffang@hunnu.edu.cn

Cite this article: 

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

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