Data di Pubblicazione:
2015
Citazione:
Bounds to precision for quantum interferometry with Gaussian states and operations / C. Sparaciari, S. Olivares, M.G.A. Paris. - In: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA. B, OPTICAL PHYSICS. - ISSN 0740-3224. - 32:7(2015 Jul 01), pp. 1354-1359. [10.1364/JOSAB.32.001354]
Abstract:
We address high-precision measurements by active and passive interferometric schemes based on Gaussian states
and operations. In particular, we look for the best states to be injected into their ports according to the quantum
Cramér- Rao bound, i.e., maximizing the quantum Fisher information over all the involved parameters, given a
constraint on the overall mean number of photons entering into the interferometer. We found that for passive
interferometers involving only beam splitters, the optimal input leading to Heisenberg scaling is a pair of identical
squeezed-coherent states with at most one-third of the total energy employed in squeezing. For active interferometers involving optical amplifiers, input coherent signals are enough to achieve Heisenberg scaling, given an optimal value of the amplification gain. For passive schemes our results clarify the role of squeezing in improving
both the reference phase and the signal phase of an interferometer.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
phase measurement; mechanics; geometry; limit
Elenco autori:
C. Sparaciari, S. Olivares, M.G.A. Paris
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