Detuning-enhanced cavity spin squeezing
Yan‐Lei Zhang, Chang‐Ling Zou, Xu‐Bo Zou, Liang Jiang, Guang‐Can Guo · Physical Review A · 2015
The unconditional squeezing of the collective spins of an atomic ensemble in a laser driven optical cavity [I. D. Leroux, M. H. Schleier-Smith, and V. Vuleti\ifmmode \acute{c}\else \'{c}\fi{}, Phys. Rev. Lett 104, 073602 (2010)] is studied and analyzed theoretically. Surprisingly, we find that the largely detuned driving laser can improve the scaling of cavity squeezing from ${S}^{\ensuremath{-}2/5}$ to ${S}^{\ensuremath{-}2/3}$, where $S$ is the total atomic spin. Moreover, we also demonstrate that the experimental imperfection of photon scattering into free space can be efficiently suppressed by detuning.