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Quantum Fisher information for density matrices with arbitrary ranks

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 a infinite dimensional density matrix with a finite support. Besides, a matrix representation of the QFI is also given.

preprint2013arXivOpen access
Jing LiuXiao-Xing JingWei ZhongXiaoguang Wang
quant-ph
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Open access4 authors1 topic
Imported metadata coverageMissing code, dataset, citation and institution fields are tracked without dominating the paper.Details
Citations: 0Reviews: 0Saves: 0Code: not linkedDataset: not linkedInstitutions: 0

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Jing LiuXiao-Xing JingWei ZhongXiaoguang Wang

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