Enhanced squeezing of a collective spin via control of its qudit subsystems

Unitary control of qudits can improve the collective spin squeezing of an atomic ensemble. Preparing the atoms in a state with large quantum fluctuations in magnetization strengthens the entangling Faraday interaction. The resulting increase in interatomic entanglement can be converted into metrolog...

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Bibliographic Details
Published in:Physical review letters 2012-10, Vol.109 (17), p.173603-173603, Article 173603
Main Authors: Norris, Leigh M, Trail, Collin M, Jessen, Poul S, Deutsch, Ivan H
Format: Article
Language:English
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Summary:Unitary control of qudits can improve the collective spin squeezing of an atomic ensemble. Preparing the atoms in a state with large quantum fluctuations in magnetization strengthens the entangling Faraday interaction. The resulting increase in interatomic entanglement can be converted into metrologically useful spin squeezing. Further control can squeeze the internal atomic spin without compromising entanglement, providing an overall multiplicative factor in the collective squeezing. We model the effects of optical pumping and study the tradeoffs between enhanced entanglement and decoherence. For realistic parameters we see improvements of ~10 dB.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.109.173603