Squeezed-light optical magnetometry.

@article{Wolfgramm2010SqueezedlightOM,
  title={Squeezed-light optical magnetometry.},
  author={F. Wolfgramm and A. Cer{\'e} and F. Beduini and A. Predojevi{\vc} and M. Koschorreck and M. Mitchell},
  journal={Physical review letters},
  year={2010},
  volume={105 5},
  pages={
          053601
        }
}
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. 
Quantum-light-enhanced optical magnetometry
Nonlinear optical magnetometry with accessible in situ optical squeezing
Quantum-Enhanced Optomechanical Magnetometry
Experimental light-squeezing-enhanced magnetometry
Shot-noise-limited magnetometer with sub-picotesla sensitivity at room temperature.
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