Full photon-number-resolving detection in a nonlinear interferometer yields a 2.37 dB unconditional shot-noise violation under realistic losses, delivering 44% better estimation precision than click detection.
It is straightforward to show that in both cases the maximum value isF max coh =N 0
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Improving the loss threshold for quantum advantage in photonic sensors by complete photon counting
Full photon-number-resolving detection in a nonlinear interferometer yields a 2.37 dB unconditional shot-noise violation under realistic losses, delivering 44% better estimation precision than click detection.