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

Leigh M. Norris, Collin M. Trail, Poul S. Jessen, Ivan H. Deutsch

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


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 ∼10dB.

Original languageEnglish (US)
Article number173603
JournalPhysical review letters
Issue number17
StatePublished - Oct 23 2012

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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