Quantum Fisher Information for Density Matrices with Arbitrary Ranks 被引量：1

Quantum Fisher Information for Density Matrices with Arbitrary Ranks

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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.

作者刘京井晓辛钟伟王晓光

机构地区 Zhejiang Institute of Modern Physics

出处《Communications in Theoretical Physics》 SCIE CAS CSCD 2014年第1期45-50,共6页 理论物理通讯（英文版）

基金 Supported by the National Fundamental Research Program of China under Grant No.2012CB921602 the National Natural Science Foundation of China under Grants Nos.11025527 and 10935010

关键词 quantum Fisher information quantum metrology density matrix Fisher信息密度矩阵矩阵的秩量子通用系统矩阵表示表达式无限维

分类号 O413 [理学—理论物理]

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Communications in Theoretical Physics

2014年第1期

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Quantum Fisher Information for Density Matrices with Arbitrary Ranks 被引量：1

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