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Squeezed-Light Optical Magnetometry

2010; American Physical Society; Volume: 105; Issue: 5 Linguagem: Inglês

10.1103/physrevlett.105.053601

1092-0145

Florian Wolfgramm, Alessandro Ceré, Federica A. Beduini, Ana Predojević, Marco Koschorreck, Morgan W. Mitchell,

Cold Atom Physics and Bose-Einstein Condensates

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.