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Overcoming inefficient detection in sub-shot-noise absorption measurement and imaging

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posted on 2023-11-30, 06:29 authored by E. Knyazev, F. Ya. Khalili, M. V. Chekhova
Photon-number squeezing and correlations enable measurement of absorption with an accuracy exceeding that of the shot-noise limit. However, sub-shot noise imaging and sensing based on these methods require high detection efficiency, which can be a serious obstacle if measurements are carried out in "difficult" spectral ranges. We show that this problem can be overcome through the phase-sensitive amplification before detection. Here we propose an experimental scheme of sub-shot-noise imaging with tolerance to detection losses.

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