Quantum radio antenna, published in Nature Communications

Our optically-biased Rydberg microwave receiver uses hybrid nonlinear interferometry in a rubidium vapour cell: it is highly sensitive, calibrates itself and is powered only by light (Nature Communications 16, 8975). Read the Faculty of Physics press release.

Measuring and correcting laser phase noise in real time improves the signal-to-noise ratio by 35 dB, reaching a sensitivity of 176 nV cm⁻¹ Hz⁻¹ᐟ².