Data di Pubblicazione:
2007
Citazione:
Optimal quantum estimation of loss in bosonic channels / A. Monras, M. Paris. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 98:16(2007), pp. 160401.160401-1-160401.160401-4. [10.1103/PhysRevLett.98.160401]
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.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
quantum theory ; shot noise
Elenco autori:
A. Monras, M. Paris
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