Unitary Cavity Spin Squeezing by Quantum Erasure
Quantum Physics
2015-05-30 v2
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. Vuleti\'{c}, Phys. Rev. A 81, 021804(R) (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 S^(-2/3), where S is the total atomic spin.
Cite
@article{arxiv.1109.3752,
title = {Unitary Cavity Spin Squeezing by Quantum Erasure},
author = {Ian D. Leroux and Monika H. Schleier-Smith and Hao Zhang and Vladan Vuletić},
journal= {arXiv preprint arXiv:1109.3752},
year = {2015}
}
Comments
10 pages, 6 figures; sections reordered and text edited for clarity