Quantum enhancement of N-photon phase sensitivity by interferometric addition of down-converted photon pairs to weak coherent light

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dc.creatorOno, Takafumi
dc.creatorHofmann, Holger F.
dc.date2007-08-21
dc.date2008-04-01
dc.date.accessioned2026-07-07T09:33:53Z
dc.date.available2026-07-07T09:33:53Z
dc.descriptionIt is shown that the addition of down-converted photon pairs to coherent laser light enhances the N-photon phase sensitivity due to the quantum interference between components of the same total photon number. Since most of the photons originate from the coherent laser light, this method of obtaining non-classical N-photon states is much more efficient than methods based entirely on parametrically down-converted photons. Specifically, it is possible to achieve an optimal phase sensitivity of about delta phi^2=1/N^(3/2), equal to the geometric mean of the standard quantum limit and the Heisenberg limit, when the average number of down-converted photons contributing to the N-photon state approaches (N/2)^(1/2).
dc.description21 pages, including 6 figures. Extended version gives more details on down-conversion efficiencies and clarifies the relation between phase sensitivity and squeezing. The title has been changed in order to avoid misunderstandings regarding these concepts
dc.identifierhttps://arxiv.org/abs/0708.2809
dc.identifierhttp://arxiv.org/abs/0708.2809
dc.identifierJ. Phys. B: At. Mol. Opt. Phys. 41, 095502 (2008)
dc.identifierdoi:10.1088/0953-4075/41/9/095502
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/159294
dc.subjectQuantum Physics
dc.titleQuantum enhancement of N-photon phase sensitivity by interferometric addition of down-converted photon pairs to weak coherent light
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