Travis Horrom, Robinjeet Singh, Jonathan P. Dowling, Eugeniy E. Mikhailov
We report the demonstration of a magnetometer with broadband noise-floor
reduction below the shot-noise level. This magnetometer, based on a nonlinear
magneto-optical rotation effect, is enhanced by the injection of a squeezed
vacuum state into its input. The noise spectrum shows squeezed noise reduction
of about 2 dB spanning from close to 100 Hz to several megahertz. We also
report on the observation of two different regimes of operation of such a
magnetometer: one in which the detection noise is limited by the quantum noise
of the light probe only, and one in which we see additional noise from the
light-atom interaction.
View original:
http://arxiv.org/abs/1202.3831
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