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- W4306291219 abstract "The power of quantum sensing rests on its ultimate precision limit, quantified by the quantum Cram'er-Rao bound (QCRB), which can surpass classical bounds. In multi-parameter estimation, the QCRB is not always saturated as the quantum nature of associated observables may lead to their incompatibility. Here we explore the precision limits of multi-parameter estimation through the lens of quantum geometry, enabling us to experimentally evaluate the QCRB via quantum geometry measurements. Focusing on two- and three-parameter estimation, we elucidate how fundamental quantum uncertainty principles prevent the saturation of the bound. By linking a metric of quantumness to the system geometric properties, we investigate and experimentally extract the attainable QCRB for three-parameter estimations." @default.
- W4306291219 created "2022-10-15" @default.
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- W4306291219 date "2022-04-28" @default.
- W4306291219 modified "2023-09-27" @default.
- W4306291219 title "A geometric perspective: experimental evaluation of the quantum Cramer-Rao bound" @default.
- W4306291219 doi "https://doi.org/10.48550/arxiv.2204.13777" @default.
- W4306291219 hasPublicationYear "2022" @default.
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