Squeezing of Collective Excitations in Spin Ensembles

TL;DR

This paper explores creating two-mode spin squeezed states in separate spin ensembles via cavity-mediated interactions, analyzing their dynamics, transfer properties, and robustness against inhomogeneities.

Contribution

It introduces a method to generate and analyze two-mode spin squeezing in separate ensembles, including effects of inhomogeneities and transfer to cavity fields.

Findings

Squeezing is achievable over a wide parameter range.

Squeezing can be transferred to cavity fields and output modes.

Inhomogeneities impact the squeezing properties.

Abstract

We analyse the possibility to create two-mode spin squeezed states of two separate spin ensembles by inverting the spins in one ensemble and allowing spin exchange between the ensembles via a near resonant cavity field. We investigate the dynamics of the system using a combination of numerical and analytic calculations, and we obtain squeezing for a wide range of parameters. We also investigate the transfer of the squeezing properties to the cavity field and to an output mode from the cavity. Finally, we investigate how the squeezing is affected by effects of inhomogeneities which would be present in solid state implementations of the spin ensembles.