Chaos and quantum Fisher information in the quantum kicked top

作     者：王晓茜 马健 张喜和 王晓光 

作者机构：Department of PhysicsChangchun University of Science and Technology Zhejiang Institute of Modern PhysicsDepartment of PhysicsZhejiang University 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2011年第20卷第5期

页      面：199-203页

核心收录：

学科分类：07[理学] 070201[理学-理论物理] 0702[理学-物理学] 

基　　金：Project supported by National Natural Science Foundation of China (Grant Nos. 11025527 10874151 and 10935010) 

主　　题：quantum information quantum kicked top quantum Fisher information quantum chaos 

摘      要：Quantum Fisher information is related to the problem of parameter estimation. Recently, a criterion has been proposed for entanglement in multipartite systems based on quantum Fisher information. This paper studies the behaviours of quantum Fisher information in the quantum kicked top model, whose classical correspondence can be chaotic. It finds that, first, detected by quantum Fisher information, the quantum kicked top is entangled whether the system is in chaotic or in regular case. Secondly, the quantum Fisher information is larger in chaotic case than that in regular case, which means, the system is more sensitive in the chaotic case.