Remote Infrared Absorption Spectroscopy with Undetected Photons

• URL: http://arxiv.org/abs/2607.16419v2
• Date: Wed, 22 Jul 2026 08:33:45 GMT
• Title: Remote Infrared Absorption Spectroscopy with Undetected Photons
• Abstract summary: We demonstrate a novel method for remote open-path Fourier-transform infrared spectroscopy with undetected photons.<n>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.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• 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.

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