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- W4287730954 abstract "Abstract Lossy bosonic channels play an important role in a number of quantum information tasks, since they well approximate thermal dissipation in an experiment. Here, we characterize their metrological power in the idler-free and entanglement-assisted cases, using respectively single- and two-mode Gaussian states as probes. In the problem of estimating the loss parameter, we study the power-constrained quantum Fisher information (QFI) for generic temperature and loss parameter regimes, showing qualitative behaviours of the optimal probes. We show semi-analytically that the two-mode squeezed-vacuum state optimizes the QFI for any value of the loss parameter and temperature. We discuss the optimization of the total QFI, where the number of probes is allowed to vary by keeping the total power constrained. In this context, we elucidate the role of the ‘shadow-effect’, or passive signature, for reaching a quantum advantage. Finally, we discuss the implications of our results for the quantum illumination and quantum reading protocols." @default.
- W4287730954 created "2022-07-26" @default.
- W4287730954 creator A5009647120 @default.
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- W4287730954 date "2022-08-30" @default.
- W4287730954 modified "2023-10-18" @default.
- W4287730954 title "Gaussian quantum estimation of the loss parameter in a thermal environment" @default.
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- W4287730954 doi "https://doi.org/10.1088/1751-8121/ac83fa" @default.
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