Quantum Fisher Information for Density Matrices with Arbitrary Ranks

被引：0

作者：

刘京

井晓辛

钟伟

王晓光

机构：

[1] ZhejiangInstituteofModernPhysics,DepartmentofPhysics,ZhejiangUniversity

来源：

CommunicationsinTheoreticalPhysics | 2014年 / 61卷 / 01期

关键词：

quantum Fisher information; quantum metrology; density matrix;

D O I：

暂无

中图分类号：

O413 [量子论];

学科分类号：

070201 ;

摘要：

We provide a new expression of the quantum Fisher information(QFI) for a general system.Utilizing this expression,the QFI for a non-full rank density matrix is only determined by its support.This expression can bring convenience for an infinite-dimensional density matrix with a finite support.Besides,a matrix representation of the QFI is also given.

引用

页码：45 / 50

页数：6