Measurement-induced spin squeezing in a cavity

TL;DR

This paper demonstrates that continuous photon measurement in a high-Q cavity can enhance spin squeezing of atomic ensembles, achieving a steady-state squeezing proportional to N^{-1/3} across various initial states.

Contribution

It introduces a method to improve spin squeezing via measurement in cavity QED, achieving a steady-state with a specific scaling law.

Findings

Spin squeezing is enhanced by photon measurement.

A steady-state with squeezing proportional to N^{-1/3} is achieved.

The method is robust over different initial states.

Abstract

Spin squeezing of an ensemble of N atoms in a high-Q cavity is shown to be enhanced by continuous measurement of photons in the cavity. A degree of spin squeezing proportional to N^{-1/3} is attained as a quasi-steady state over a broad set of initial states of the atoms and photons.