Spin squeezing of atomic ensembles by multi-colour quantum non-demolition measurements

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dc.creatorSaffman, M.
dc.creatorOblak, D.
dc.creatorAppel, J.
dc.creatorPolzik, E. S.
dc.date2008-08-04
dc.date2009-05-14
dc.date.accessioned2026-07-07T13:14:16Z
dc.date.available2026-07-07T13:14:16Z
dc.descriptionWe analyze the creation of spin squeezed atomic ensembles by simultaneous dispersive interactions with several optical frequencies. A judicious choice of optical parameters enables optimization of an interferometric detection scheme that suppresses inhomogeneous light shifts and keeps the interferometer operating in a balanced mode that minimizes technical noise. We show that when the atoms interact with two-frequency light tuned to cycling transitions the degree of spin squeezing $ξ^2$ scales as $ξ^2\sim 1/d$ where $d$ is the resonant optical depth of the ensemble. In real alkali atoms there are loss channels and the scaling may be closer to $ξ^2\sim 1/\sqrt d.$ Nevertheless the use of two-frequencies provides a significant improvement in the degree of squeezing attainable as we show by quantitative analysis of non-resonant probing on the Cs D1 line. Two alternative configurations are analyzed: a Mach-Zehnder interferometer that uses spatial interference, and an interaction with multi-frequency amplitude modulated light that does not require a spatial interferometer.
dc.description7 figures
dc.identifierhttps://arxiv.org/abs/0808.0516
dc.identifierhttp://arxiv.org/abs/0808.0516
dc.identifierPhys. Rev. A 79, 023831 (2009)
dc.identifierdoi:10.1103/PhysRevA.79.023831
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/230158
dc.subjectQuantum Physics
dc.titleSpin squeezing of atomic ensembles by multi-colour quantum non-demolition measurements
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