Quantum Fisher Information Gap for Systems with Nonlinear Hamiltonians  

作　　者：刘博 黄奕筱 王晓光 

机构地区：[1]Zhejiang Institute of Modern Physics, Department of Physics, Zhejiang University [2]School of Physics, Changchun Normal University [3]School of Science, Zhejiang University of Science and Technology

出　　处：《Communications in Theoretical Physics》2019年第1期43-48,共6页理论物理通讯（英文版）

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

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.

关 键 词：quantum Fisher information quantum metrology nonlinear Hamiltonians 

分 类 号：O4[理学—物理]