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We demonstrate simultaneous detection of radio-frequency (RF) fields rangingfrom the very high-frequency (VHF) band (128 MHz) to terahertz frequencies(0.61 THz) using a caesium Rydberg-atom receiver. The RF fields areconcurrently applied to a series of atomic transitions involving states ofincreasing orbital angular momentum, where the energy separations becomeprogressively smaller, allowing access to a very wide range of radiofrequencies. We show that the optical response of the system in the presence ofthe RF fields can be reproduced theoretically using a simpleLindblad-master-equation approach. Furthermore, we demonstrate experimentallythat a series of amplitude-modulated tones can be detected simultaneously usingmultiple carrier frequencies. This demonstration opens the way for RFcommunications across multiple bands simultaneously using a single opticalreceiver.

Simultaneous multi-band radio-frequency detection using high-orbital-angular-momentum states in a Rydberg-atom receiver