Nonlinear optical magnetometry with accessible in situ optical squeezing

TL;DR

This paper presents a compact, accessible method for nonlinear optical magnetometry using in situ optical squeezing via four-wave mixing in rubidium vapor, achieving quantum noise reduction and enhanced signal-to-noise ratio.

Contribution

It introduces a novel approach combining four-wave mixing and optical squeezing in a single vapor cell for improved magnetometry.

Findings

Achieved 4.7 dB of quantum noise reduction.

Enhanced signal-to-noise ratio through polarization rotation signals.

Demonstrated a compact and accessible magnetometry setup.

Abstract

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.