Simultaneous multi-band radio-frequency detection using high-orbital-angular-momentum states in a Rydberg-atom receiver
arxiv(2023)
Abstract
We demonstrate simultaneous detection of radio-frequency (RF) fields ranging
from the very high-frequency (VHF) band (128 MHz) to terahertz frequencies
(0.61 THz) using a caesium Rydberg-atom receiver. The RF fields are
concurrently applied to a series of atomic transitions involving states of
increasing orbital angular momentum, where the energy separations become
progressively smaller, allowing access to a very wide range of radio
frequencies. We show that the optical response of the system in the presence of
the RF fields can be reproduced theoretically using a simple
Lindblad-master-equation approach. Furthermore, we demonstrate experimentally
that a series of amplitude-modulated tones can be detected simultaneously using
multiple carrier frequencies. This demonstration opens the way for RF
communications across multiple bands simultaneously using a single optical
receiver.
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