Quantum Fisher Information Gap for Systems with Nonlinear Hamiltonians

作     者：刘博 黄奕筱 王晓光 

作者机构：Zhejiang Institute of Modern Physics Department of Physics Zhejiang University School of Physics Changchun Normal University School of Science Zhejiang University of Science and Technology 

出 版 物：《Communications in Theoretical Physics》 (理论物理通讯（英文版）)

年 卷 期：2019年第71卷第1期

页      面：43-48页

核心收录：

学科分类：07[理学] 0704[理学-天文学] 0702[理学-物理学] 

基　　金：Supported by the National Key Research and Development Program of China under Grant Nos.2017YFA0304202 and 2017YFA0205700 the National Natural Science Foundation of China under Grant No.11875231 the Fundamental Research Funds for the Central Universities under Grant No.2018FZA3005 support by the Thirteenth Five-year Planning Project of Jilin Provincial Education Department Foundation under Grant No.JJKH20170650KJ Natural Science Foundation of Changchun Normal University 

主　　题：quantum Fisher information metrology nonlinear Hamiltonians 

摘      要：Quantum Fisher information(QFI) gap characterizes the stability of QFI to space directions. We study the QFI distributions and QFI gap for quantum states generated from nonlinear Hamiltonians for both spin and bosonic systems. We find that the same spin-squeezing parameter(or principle squeezing parameter) corresponds to two different values QFI gap, and the locations of all extreme points of the QFI are explicitly given.