A record-breaking microwave-to-optics conversion efficiency of 82% over a 1 MHz bandwidth for low photon numbers is achieved by using a gas of Rydberg atoms, paving the way towards applications in quantum technologies.
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The author declares no competing interests.
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Covey, J.P. Microwave–optical transducer efficiency boost. Nat. Photon. 16, 262–264 (2022). https://doi.org/10.1038/s41566-022-00977-1