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Cooling radio waves to their quantum ground state

The device used a recently developed technique the researchers call photon pressure coupling, which is predicted to be of use in detecting ultra-weak magnetic resonance (MRI) signals or for quantum-sensing applications that can help the search for dark matter. Using circuits that employ an analog of the laser cooling technique that is often used to cool atom clouds, the authors cooled the radio wave signals in their device all the way down to the quantum ground state.

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