1. Unitary cavity spin squeezing by quantum erasure.
- Author
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Leroux, Ian D., Schleier-Smiu, Monika H., Zhang, Hao, and Vuletic, Vladan
- Subjects
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NUCLEAR spin , *QUANTUM theory , *PHOTONS , *ATOM-atom collisions , *LIGHT scattering , *ELECTRONIC noise - Abstract
Deterministic light-induced spin squeezing in an atomic gas is limited by photon shot noise or, equivalently, by atomic state information escaping with the light field mediating the effective atom-atom interaction. We show theoretically that the performance of cavity spin squeezing [M. H. Schleier-Smith, I. D. Leroux, and V. Vuletic, Phys. Rev. A 81, 021804 (2010)] can be substantially improved by erasing the light-atom entanglement, and propose several methods for doing so. Accounting for light scattering into free space, quantum erasure improves the scaling of cavity squeezing from S-1/2 to 5-2/3, where 5 is the total atomic spin. [ABSTRACT FROM AUTHOR]
- Published
- 2012
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