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• W1983173896 abstract "We address the estimation of the loss parameter of a bosonic channel probed by Gaussian signals. We derive the ultimate quantum bound with precision and show that no improvement may be obtained by having access to the environmental degrees of freedom. We find that, for small losses, the variance of the optimal estimator is proportional to the loss parameter itself, a result that represents a qualitative improvement over the shot-noise limit. An observable based on the symmetric logarithmic derivative is obtained, which attains the ultimate bound and may be implemented using Gaussian operations and photon counting." @default.
• W1983173896 created "2016-06-24" @default.
• W1983173896 creator A5006726322 @default.
• W1983173896 creator A5090413017 @default.
• W1983173896 date "2007-04-17" @default.
• W1983173896 modified "2023-10-09" @default.
• W1983173896 title "Optimal Quantum Estimation of Loss in Bosonic Channels" @default.
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• W1983173896 doi "https://doi.org/10.1103/physrevlett.98.160401" @default.
• W1983173896 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17501396" @default.
• W1983173896 hasPublicationYear "2007" @default.
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