Remote Infrared Absorption Spectroscopy with Undetected Photons

Abstract:We demonstrate a novel method for remote open-path Fourier-transform infrared spectroscopy with undetected photons. Similar to previous quantum spectroscopy works, a mid-infrared spectrum is reconstructed by detecting a near-infrared radiation only, thus bypassing important limitations of infrared detectors. Our study however relies on the co-propagation of the photon-pair and the pump-laser over the same optical path, which allows the probing of the open atmosphere over long distances. By sending the photons over unprecedented distances of up-to 43.4m in the outdoor atmosphere, we were able to detect butane released in the open-path, as well as natural atmospheric methane, thus demonstrating the first use of infrared spectroscopy with undetected photons for atmospheric measurements.

Quantum Physics (quant-ph); Optics (physics.optics)

arXiv:2607.16419 [quant-ph]

(or arXiv:2607.16419v1 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2607.16419 Focus to learn more arXiv-issued DOI via DataCite (pending registration)

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