Implementation of Cavity Squeezing of a Collective Atomic Spin

TL;DR

This paper demonstrates unconditional spin squeezing of a collective atomic ensemble using cavity interactions, achieving significant metrological enhancement with a simple analytical model accurately describing the process.

Contribution

The work introduces a method for unconditional spin squeezing of cold rubidium atoms via cavity interactions, validated by a simple analytical model, and achieves up to 5.6 dB of squeezing.

Findings

Achieved up to 5.6 dB of spin squeezing.

The spin uncertainty region is well described by a simple analytical model.

Demonstrated unconditional squeezing in a dilute atomic ensemble.

Abstract

We squeeze unconditionally the collective spin of a dilute ensemble of laser-cooled rubidium-87 atoms using their interaction with a driven optical resonator. The shape and size of the resulting spin uncertainty region are well described by a simple analytical model [M.H.S., I.D.L., V.V., arXiv:0911.3936] through two orders of magnitude in the effective interaction strength, without free parameters. We deterministically generate states with up to 5.6(6) dB of metrologically relevant spin squeezing on the canonical rubidium-87 hyperfine clock transition.