A room-temperature rubidium vapor cell detects 2.5 GHz microwave signals phase-sensitively using three microwave tones in an atomic transition loop, with sensitivity around 3.2 µV cm^-1 Hz^-1/2.
Fiber-coupled vapor cell for a portable rydberg atom-based radio frequency electric field sensor,
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Superheterodyne Rydberg S-band receiver with a multi-tone local oscillator based on an atomic transition loop
A room-temperature rubidium vapor cell detects 2.5 GHz microwave signals phase-sensitively using three microwave tones in an atomic transition loop, with sensitivity around 3.2 µV cm^-1 Hz^-1/2.