Noise mitigation in quantum enhanced fiber optic gyroscopes

Abstract: We analyze noise sources in a quantum-enhanced fiber optic gyroscope (FOG), aiming toward improving the feasibility of long (multiple km) fiber lengths and higher order $N>2$ polarization entangled N00N states. We focus on one of the leading sources of quantum FOG phase uncertainty, uncorrelated photon saturation. We characterize the optimal ranges of phase bias angles which minimize this uncertainty to allow for sub-shot noise precision. As an example, we apply the present-day leading quantum FOG experiment as part of our analysis. This opens up a path to sub-shot noise angular rotation sensitivity further beyond the earth's rotation rate.