Journal
PHYSICAL REVIEW A
Volume 86, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.86.023803
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Funding
- Intelligence Advanced Research Projects Activity
- National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [0758010, 0968895] Funding Source: National Science Foundation
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We report the demonstration of a magnetometer with 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 +/- 0.35 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 originating from laser noise which is rotated into the vacuum polarization.
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