GENERAL

Quantum Fisher Information for Density Matrices with Arbitrary Ranks

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2013 Chinese Physical Society and IOP Publishing Ltd
, , Citation Liu Jing et al 2014 Commun. Theor. Phys. 61 45 DOI 10.1088/0253-6102/61/1/08

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1 Zhejiang Institute of Modern Physics, Department of Physics, Zhejiang University, Hangzhou 310027, China

Dates

  1. Received 18 October 2013
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0253-6102/61/1/45

Abstract

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.

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