Squeezed-Light Optical Magnetometry
arXiv:1008.1721 · doi:10.1103/PhysRevLett.105.053601
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.
v1: version published in Phys. Rev. Lett.; v2: version with five additional citations