Army Builds Wideband DC to 20 GHz Quantum Receiver
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https://www.rtl-sdr.com/army-builds-wideband-dc-to-20-ghz-quantum-receiver/
Back in July 2019 we posted about a new development in radio technology known as "Atomic Radio" or "Quantum Radio". In that post we discussed an article that explained the concept and science behind the idea and noted how some researchers described the possibility of a very wideband capable receiver.
Recently the US Army has described how they built a quantum radio that can receive from DC to 20 GHz. If you're interested in the science, the paper is published in the Journal of Physics B: Atomic, Molecular and Optical Physics and it is available on sci-hub. The radio uses something called a Rydberg sensor which they describe below.
Journal Reference:
David H Meyer et al, Assessment of Rydberg atoms for wideband electric field sensing 2020 J. Phys. B: At. Mol. Opt. Phys, https://sci-hub.se/10.1088/1361-6455/ab6051
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