All path-symmetric pure states achieve their maximal phase sensitivity in conventional two-path interferometry

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dc.creatorHofmann, Holger F.
dc.date2008-11-29
dc.date.accessioned2026-07-07T12:52:36Z
dc.date.available2026-07-07T12:52:36Z
dc.descriptionIt is shown that the condition for achieving the quantum Cramer-Rao bound of phase estimation in conventional two-path interferometers is that the state is symmetric with regard to an (unphysical) exchange of the two paths. Since path symmetry is conserved under phase shifts, the maximal phase sensitivity can be achieved at arbitrary bias phases, indicating that path symmetric states can achieve their quantum Cramer-Rao bound in Bayesian estimates of a completely unknown phase.
dc.description4 pages, no figures
dc.identifierhttps://arxiv.org/abs/0812.0044
dc.identifierhttp://arxiv.org/abs/0812.0044
dc.identifierPhys. Rev. A 79, 033822 (2009)
dc.identifierdoi:10.1103/PhysRevA.79.033822
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/223344
dc.subjectQuantum Physics
dc.titleAll path-symmetric pure states achieve their maximal phase sensitivity in conventional two-path interferometry
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