Journal
COMMUNICATIONS IN THEORETICAL PHYSICS
Volume 61, Issue 1, Pages 45-50Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0253-6102/61/1/08
Keywords
quantum Fisher information; quantum metrology; density matrix
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Funding
- National Fundamental Research Program of China [2012CB921602]
- National Natural Science Foundation of China [11025527, 10935010]
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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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