Robust spin squeezing via photon-mediated interactions on an optical clock transition

TL;DR

This paper proposes a new scheme for generating robust spin-squeezed states in cavity-QED systems that mitigates the fundamental limitations caused by collective emission, enhancing quantum metrology applications.

Contribution

It introduces an alternative method for spin squeezing that is resistant to collective emission, improving upon traditional one-axis twisting approaches in optical clock transitions.

Findings

The new scheme reduces the impact of collective emission on squeezing quality.

Analysis shows improved robustness against experimental noise and imperfections.

The approach enhances the potential for high-precision quantum measurements.

Abstract

Cavity-QED is a promising avenue for the deterministic generation of entangled and spin-squeezed states for quantum metrology. One archetypal scheme generates squeezing via collective one-axis twisting interactions. However, we show that in implementations using optical transitions in long-lived atoms the achievable squeezing is fundamentally limited by collectively enhanced emission into the cavity mode which is generated in parallel with the cavity-mediated spin-spin interactions. We propose an alternative scheme which generates a squeezed state that is protected from collective emission, and investigate its sensitivity to realistic sources of experimental noise and imperfections.