Phys. Rev. Lett. 105, 053601 (2010) [4 pages]Squeezed-Light Optical MagnetometryReceived 22 April 2010; revised 15 June 2010; published 29 July 2010 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. © 2010 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.105.053601
DOI:
10.1103/PhysRevLett.105.053601
PACS:
42.50.Lc, 07.55.Ge, 42.50.Dv, 42.65.Yj
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