For coherent light, a saturating photodetector's average current is I=I_max(1-exp(-N/Ñ_sat)); inverting this relation recovers the optical phase in the nonlinear response regime.
Parameter estimation of wormholes beyond the Heisenberg limit
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We propose to exploit the quantum properties of nonlinear media to estimate the parameters of massless wormholes. The spacetime curvature produces a change in length with respect to Minkowski spacetime that can be estimated in principle with an interferometer. We use quantum metrology techniques to show that the sensitivity is improved with nonlinear media and propose a nonlinear Mach-Zehnder interferometer to estimate the parameters of massless wormholes that scales beyond the Heisenberg limit.
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Optical phase estimation via homodyne measurement in the presence of saturation effect of photodetectors
For coherent light, a saturating photodetector's average current is I=I_max(1-exp(-N/Ñ_sat)); inverting this relation recovers the optical phase in the nonlinear response regime.