Optimal estimation of losses at the ultimate quantum limit with non-Gaussian states

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dc.creatorAdesso, G.
dc.creatorDell'Anno, F.
dc.creatorDe Siena, S.
dc.creatorIlluminati, F.
dc.creatorSouza, L. A. M.
dc.date2008-07-24
dc.date2009-04-23
dc.date.accessioned2026-07-07T13:07:03Z
dc.date.available2026-07-07T13:07:03Z
dc.descriptionWe address the estimation of the loss parameter of a bosonic channel probed by arbitrary signals. Unlike the optimal Gaussian probes, which can attain the ultimate bound on precision asymptotically either for very small or very large losses, we prove that Fock states at any fixed photon number saturate the bound unconditionally for any value of the loss. In the relevant regime of low-energy probes, we demonstrate that superpositions of the first low-lying Fock states yield an absolute improvement over any Gaussian probe. Such few-photon states can be recast quite generally as truncations of de-Gaussified photon-subtracted states.
dc.description4 pages, 3 figures
dc.identifierhttps://arxiv.org/abs/0807.3958
dc.identifierhttp://arxiv.org/abs/0807.3958
dc.identifierPhys. Rev. A 79, 040305(R) (2009)
dc.identifierdoi:10.1103/PhysRevA.79.040305
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/227970
dc.subjectQuantum Physics
dc.subjectOther Condensed Matter
dc.subjectHigh Energy Physics - Theory
dc.subjectMathematical Physics
dc.subjectOptics
dc.titleOptimal estimation of losses at the ultimate quantum limit with non-Gaussian states
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