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• W3216868404 abstract "In this work, we present a lower bound on the quantum Fisher information (QFI) which is efficiently computable on near-term quantum devices. 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 subnormalized states, and hence it generalizes the standard QFI in this sense. Our bound employs the generalized fidelity applied to a truncated state, which is constructed via the $m$ largest eigenvalues and their corresponding eigenvectors of the probe quantum state ${ensuremath{rho}}_{ensuremath{theta}}$. Focusing on unitary families of exact states, we analyze the properties of our proposed lower bound, and demonstrate its utility for efficiently estimating the QFI." @default.
• W3216868404 created "2021-12-06" @default.
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• W3216868404 date "2021-12-02" @default.
• W3216868404 modified "2023-10-11" @default.
• W3216868404 title "Generalized measure of quantum Fisher information" @default.
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• W3216868404 doi "https://doi.org/10.1103/physreva.104.062602" @default.
• W3216868404 hasPublicationYear "2021" @default.
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