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Researchers used quantum logic spectroscopy and a Schrödinger's cat entangled state to detect the tiny recoil from a single infrared photon absorbed by a single calcium hydroxide molecule. The technique enabled the first nondestructive infrared spectrum of an individual molecule, opening new possibilities for high-precision molecular spectroscopy, quantum chemistry, and quantum technologies.

https://www.nature.com/articles/s41586-026-10915-8
Nature Infrared absorption spectroscopy of a single polyatomic molecular ion Nature - Non-destructive single-molecule absorption spectroscopy is achieved by detecting photon recoil from a trapped molecular ion, enabling single-photon-sensitive measurements of molecular...
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