Creating a giant and tunable spin squeezing via a time-dependent collective atom-photon coupling
Lixian Yu, Jingtao Fan, Shiqun Zhu, Gang Chen, Suotang Jia, Franco Nori · arXiv (Cornell University) · 2013
We present an experimentally-feasible method to produce a giant and tunable spin squeezing by introducing a time-dependent collective atom-photon coupling. We show that the maximal squeezing factor measured experimentally can be well controlled by both its driving magnitude and frequency. When increasing the driving magnitude, the maximal squeezing factor increases, and thus can be rapidly enhanced. We also demonstrate explicitly, in the high-frequency limit, that this spin squeezing arises from a strong repulsive spin-spin interaction induced by the time-dependent collective atom-photon coupling. Finally, we evaluate analytically, using current experimental parameters, the maximal squeezing factor, which can reach 40 dB. This giant squeezing factor is far larger than previous ones (lower than 10 dB).