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Conference on Lasers and Electro-Optics

Quantum Absorption Estimation for Saturable Samples

Jake Biele, Joshua W. Silverstone, Jonathan C. F. Matthews, Euan J. Allen

Published Jan 1, 2021• 0 citations
Publisher

Abstract

We model the effect of saturation in absorption spectroscopy on quantum and classical probe performance. We derive a bound on the precision for each strategy, presenting an ideal quantum probe alongside methods to maximise precision classically.
DOI
10.1364/cleo_at.2021.jw1a.139

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Quantum fluctuations in the intensity of an optical probe is noise which limits measurement precision in absorption spectroscopy. Increased probe power can offer greater precision; however, this strategy is often constrained by sample saturation. Here, we analyze measurement precision for a generalized absorption model in which we account for saturation and explore its effect on both classical and quantum probe performance. We present a classical probe-sample optimization strategy to maximize precision and find that optimal probe powers always fall within the saturation regime. We apply our optimization strategy to two examples, high-precision Doppler broadened thermometry and an absorption spectroscopy measurement of chlorophyll a. We derive a limit on the maximum precision gained from using a nonclassical probe and find a strategy capable of saturating this bound. We evaluate amplitude-squeezed light as a viable experimental probe state and find it capable of providing precision that reaches to within >85>85%>85 of the ultimate quantum limit with currently available technology.
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