An optical probe of cesium Rydberg atoms generated in a thermal vapor cell is used to retrieve a baseband signal modulated onto a 16.98-GHz carrier wave in real-time, demonstrating an atombased quantum receiver suitable for microwave communication. The 60S 1/2 Rydberg level of cesium atoms in the cell is tracked via electromagnetically induced transparency (EIT), an established laser-spectroscopic method. The microwave carrier is resonant with the 60S 1/2 → 60P 1/2 Rydberg transition, resulting in an Autler-T…
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