Journal
PHYSICAL REVIEW LETTERS
Volume 109, Issue 17, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.173603
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Funding
- NSF [PHY-0903953, 0969371, 0969997]
- AFOSR [FA95501110156]
- PIMS
- NSERC
- Division Of Physics
- Direct For Mathematical & Physical Scien [0969997] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [0903953, 0969371] Funding Source: National Science Foundation
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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 similar to 10 dB.
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