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Rydberg atoms in a gas form are highly sensitive electric field probes capable of detecting and measuring the amplitude, phase, and polarization of broadband time-varying signals. Here, we present the performance of a frequency modulated continuous wave (FMCW) radar using a Rydberg atom-based subwavelength sensor as a receiver. This sensor down-converts the radar echoes, eliminates key FMCW electrical components, and performs two-dimensional target localization. To demonstrate its capabilities, we present an radio frequency image of a scene containing targets in an anechoic room with radar cross sections down to 0 dBsm at distances up to 5 m and with a range resolution of 4.7 cm.
Watterson et al. (Mon,) studied this question.