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Rydberg-atom receivers sense radio waves with laser-probed atoms in a centimeter-scale glass cell and tune from about 100 kilohertz to terahertz frequencies. In published comparisons, conventional receivers still detect weaker signals in most bands.
Microwave atomic clocks keep GPS time, and Exail says more than 20 of its cold-atom gravimeters are deployed. Quantum navigation units, wearable brain scanners, and atom-based radio receivers are still being tested against the classical instruments they would replace.
Researchers have measured quantum illumination's advantage over classical radar only with targets about a meter away or inside a refrigerator. Chinese state media have reported 100-kilometer-class detection for a single-photon radar, a different technique, without test data.
