Generalized measure of quantum Fisher information

@article{Sone2021GeneralizedMO,
  title={Generalized measure of quantum Fisher information},
  author={Akira Sone and Mar{\'i}a Cerezo and Jacob L. Beckey and Patrick J. Coles},
  journal={Physical Review A},
  year={2021}
}
In this work, we present an efficiently computable lower bound on the quantum Fisher information (QFI). This bound itself is of interest, as we show that it satisfies the canonical criteria of a QFI measure. Specifically, it is essentially a QFI measure for sub-normalized states, and hence it generalizes the standard QFI in this sense. Our bound employs the generalized fidelity applied to the truncated state, which is constructed via the $m$ largest eigenvalues and their corresponding… 

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