Investigation of the effect of quantum measurement on parity-time symmetry  

作　　者：Wei-Chen Wang Yi Xie Man-Chao Zhang Jie Zhang Chun-Wang Wu Ting Chen Bao-Quan Ou Wei Wu Ping-Xing Chen 

机构地区：[1]Department of Physics,College of Liberal Arts and Sciences,National University of Defense Technology,Changsha 410073,China [2]Interdisciplinary Center for Quantum Information,National University of Defense Technology,Changsha 410073,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2022年第6期36-43,共8页中国科学：物理学、力学、天文学（英文版）

基　　金：This work was supported by the National Basic Research Program of China(Grant No.2016YFA0301903);the National Natural Science Foundation of China(Grant Nos.12074433,12004430,12174447,12174448,and 11904402).

摘　　要：Symmetry,including the parity-time(PT)-symmetry,is a striking topic,widely discussed and employed in many fields.It is well-known that quantum measurement can destroy or disturb quantum systems.However,can and how does quantum measurement destroy the symmetry of the measured system?To answer the pertinent question,we establish the correlation between the quan-tum measurement and Floquet PT-symmetry and investigate for the first time how the measurement frequency and measurement strength affect the PT-symmetry of the measured system using the 40Ca+ion.It is already shown that the measurement at high frequencies would break the PT symmetry.Notably,even for an inadequately fast measurement frequency,if the measurement strength is sufficiently strong,the PT symmetry breaking can occur.The current work can enhance our knowledge of quantum measurement and symmetry and may inspire further research on the effect of quantum measurement on symmetry.

关 键 词：quantum measurement PT-SYMMETRY ion trap 

分 类 号：O413[理学—理论物理]