Quantum Boost Extends Spectroscopy to Single Molecules
Researchers at the University of Innsbruck have developed a quantum logic spectroscopy technique that allows for the study of single molecular ions by entangling them with auxiliary atoms. This method amplifies light-matter interactions, enabling precise measurements without destroying the sample.
Why it matters
This advancement in quantum sensing could revolutionize molecular analysis and the development of high-precision measurement tools.
Entangling a molecular ion with an atom creates a “Schrödinger’s cat” state that is more sensitive to external disturbances than the individual particles. [Image: Helen Heinzer]
Researchers at the University of Innsbruck in Austria have devised a spectroscopic technique that can measure the characteristic vibrations of a single molecular ion (Nature, doi: 10.1038/s41586-026-10915-8 ). By entangling the molecular ion with an auxiliary atom, the method amplifies the interaction with light to detect the absorption of single photons by the molecule.
The new technique builds on the established method of absorption spectroscopy, which has become a vital tool for probing molecular structures and their energy transitions. For single molecules, however, the interaction with light is so weak that the spectrum is largely obscured by noise. Indirect methods have been used to measure the effects of light absorption, but they often perturb the molecular state or destroy the sample entirely.
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