Nonlinear optical magnetometry with accessible in situ optical squeezing.

Optics letters

PubMedID: 25490512

Otterstrom N, Pooser RC, Lawrie BJ. Nonlinear optical magnetometry with accessible in situ optical squeezing. Opt Lett. 2014;39(22):6533-6536.
We demonstrate compact and accessible squeezed-light magnetometry using four-wave mixing in a single hot rubidium vapor cell. The strong intrinsic coherence of the four-wave mixing process results in nonlinear magneto-optical rotation (NMOR) on each mode of a two-mode relative-intensity squeezed state. This framework enables 4.7 dB of quantum noise reduction while the opposing polarization rotation signals of the probe and conjugate fields add to increase the total signal to noise ratio.