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.
@article{arxiv.1008.1721,
title = {Squeezed-Light Optical Magnetometry},
author = {Florian Wolfgramm and Alessandro Cere and Federica A. Beduini and Ana Predojevic and Marco Koschorreck and Morgan W. Mitchell},
journal= {arXiv preprint arXiv:1008.1721},
year = {2010}
}
Comments
v1: version published in Phys. Rev. Lett.; v2: version with five additional citations