Squeezed-Light Optical Magnetometry

TL;DR

This paper presents a magnetometer utilizing squeezed light and the Faraday effect in rubidium atoms, achieving shot-noise-limited sensitivity enhancement, with potential applications in advanced magnetic sensing and quantum measurements.

Contribution

It introduces a magnetometer that employs polarization-squeezed light to surpass shot-noise limits, improving sensitivity by 3.2 dB in atomic ensemble measurements.

Findings

Achieved shot-noise-limited sensitivity in magnetometry.

Enhanced sensitivity by 3.2 dB using polarization-squeezed light.

Potential to improve quantum nondemolition measurements.

Abstract

We demonstrate a light-shot-noise-limited magnetometer based on the Faraday effect in a hot unpolarized ensemble of rubidium atoms. By using off-resonant, polarization-squeezed probe light, we improve the sensitivity of the magnetometer by 3.2 dB. The technique could improve the sensitivity of the most advanced magnetometers and quantum nondemolition measurements of atomic spin ensembles.