Abstract: A quantum-sensing radiofrequency (RF) receiver system includes a multi-channel single-cell detection cell containing rubidium 87 atoms. Each channel is tuned to a respective RF frequency by applying electric potentials to indium-titanium-oxide (ITO) electrodes formed on detection cell walls. The channels are tuned to different RF frequencies to provide a relatively wideband detection in the aggregate across plural channels. A laser system provides plural laser beams, including a respective probe beam, to each channel to excite the 87Ru atoms therealong to a Rydberg state. Each channel can be read out by tracking absorption for each of the plural probe beams of the multi-channel system.