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- W2948654669 abstract "A longstanding problem in quantum metrology is how to extract as much information as possible in realistic scenarios with not only multiple unknown parameters, but also limited measurement data and some degree of prior information. Here we present a practical solution to this: we derive a new Bayesian multi-parameter quantum bound, construct the optimal measurement when our bound can be saturated for a single shot and consider experiments involving a repeated sequence of these measurements. Our method properly accounts for the number of measurements and the degree of prior information, and we illustrate our ideas with a qubit sensing network and a model for phase imaging, clarifying the non-asymptotic role of local and global schemes. Crucially, our technique is a powerful way of implementing quantum protocols in a wide range of practical scenarios that tools such as the Helstrom and Holevo Cram'{e}r-Rao bounds cannot normally access." @default.
- W2948654669 created "2019-06-14" @default.
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- W2948654669 date "2020-03-20" @default.
- W2948654669 modified "2023-10-18" @default.
- W2948654669 title "Bayesian multiparameter quantum metrology with limited data" @default.
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- W2948654669 doi "https://doi.org/10.1103/physreva.101.032114" @default.
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