Quantum Fisher information for density matrices with arbitrary ranks
classification
🪐 quant-ph
keywords
densityexpressionmatrixfisherinformationquantumsupportarbitrary
read the original 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 a infinite dimensional density matrix with a finite support. Besides, a matrix representation of the QFI is also given.
This paper has not been read by Pith yet.
discussion (0)
Sign in with ORCID, Apple, or X to comment. Anyone can read and Pith papers without signing in.