Quantum Fisher Information of Driven Multi-particle Systems in Structured Bosonic Reservoirs  

作　　者：严凯 谢燕青 黄雨梦 郝翔 

机构地区：[1]Department of Physics, School of Mathematics and Physics, Suzhou University of Science and Technology, Suzhou 215009,China

出　　处：《Communications in Theoretical Physics》2017年第3期261-266,共6页理论物理通讯（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant No.11274054;the Creative Project of Graduate in University of Suzhou Science and Technology in No.SKCX16-006;the Innovation Project of Graduate Education of Jiangsu Province No.JGLX15-150

摘　　要：We investigate the dynamics of the precision of the parameter estimation in many driven atoms, each of which interacts with a local structured bosonic reservoir respectively. The evolution of quantum states for single driven atom is described by the time local quantum master equation. The dynamics of the quantum Fisher information for many entangled atoms is obtained by means of the supreoperator mapping. The estimation limit is superior to the standard quantum limit during a characteristic interval. At a given time, the precision of parameter estimation can be improved to a maximal value if the number of entangled atoms is chosen to be an optimal value. The optimal number of entangled atoms is determined by the dynamical property. The decay of quantum Fisher information is accelerated with the increase of the number of entangled atoms.

关 键 词：quantum Fisher information parameter estimation quantum entanglement bosonic reservoir 

分 类 号：O413[理学—理论物理]