Quantum Enhanced Magnetometer with Low Frequency Squeezing

Details Quantum Enhanced Magnetometer with Low Frequency Squeezing Quantum Enhanced Magnetometer with Low Frequency Squeezing

2012-02-17

arxiv.org/abs/1202.3831v1

Physics

Quantum Physics

Scientific paper

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.

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