Researchers at Delft University of Technology (TU Delft) have found a new way to cool radio waves all the way down to their quantum ground state. To do so, they used circuits that employ an analog of the so-called laser cooling technique that is frequently used to cool atomic samples. 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. The results have been published in Science Advances. Read more