Backaction noise produced via cavity-aided nondemolition measurement of an atomic clock state

TL;DR

This paper demonstrates how cavity-aided quantum nondemolition measurements can induce backaction noise that potentially enables conditional spin squeezing in atomic ensembles, advancing quantum measurement techniques.

Contribution

It introduces a protocol for generating conditional spin squeezing via backaction noise in cavity-aided nondemolition measurements of atomic states.

Findings

Backaction antisqueezing observed in the measurement process

Potential for creating conditional spin squeezing in atomic ensembles

Analysis of measurement-induced backaction effects

Abstract

We use a quantum nondemolition measurement to probe the collective pseudospin of an atomic ensemble in a high-finesse optical cavity. We analyze the backaction antisqueezing produced by the measurement process to show that our protocol could create conditional spin squeezing in the atomic ensemble.