Satellite radio detection via dual-microwave Rydberg spectroscopy

Abstract

Rydberg electric field sensors exploit the large number of Rydberg resonances to provide sensitivity over a broad range of the electromagnetic spectrum. However, due to the difficulty of accessing resonant Rydberg states at ultra-high frequency (UHF) and below, ubiquitous bands in the world's current wireless communications infrastructure, they currently fall short in sensitivity in this range. We present a resonant Rydberg electric field sensor operating in the UHF band using a dual-optical dual-microwave spectroscopy scheme. Adding an additional microwave photon allows us to access transitions between Rydberg states with higher angular momentum ($L=3\to 4$), which have lower resonant frequencies than transitions typically used in Rydberg sensors. We discuss the applicability of this type of sensor across the UHF band and below, and measure the resonant sensitivity of our system at 2.3 GHz to be 70(5) $\mu$Vm${}^{-1}{\text{Hz}}^{-1/2}$, 50 times better than the measured sensitivity with a far off-resonant probing scheme at this frequency. We also show the effectiveness of this sensing scheme by measuring Sirius XM satellite radio (2.320 - 2.345 GHz) received outside the laboratory and rebroadcast onto the atoms.

6 pages, 3 figures

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• Giant electro-optic effect using polarizable dark states
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• Continuous wideband microwave-to-optical converter based on room-temperature Rydberg atoms
• Simultaneous Multi-Band Demodulation Using a Rydberg Atomic Sensor
• Very-high- and ultrahigh- frequency electric field detection using high angular momentum Rydberg states
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• A Rydberg atom based system for benchmarking mmWave automotive radar chips
• High angular momentum coupling for enhanced Rydberg-atom sensing in the VHF band
• Atomic-optical interferometry in fractured loops: a general solution for Rydberg radio frequency receivers
• Determination of Quantum Defects and Core Polarizability of Atomic Cesium via Terahertz and Radio-Frequency Spectroscopy in Thermal Vapor
• Hyperfine structure and collisions in three-photon Rydberg electromagnetically induced transparency
• Detection of twisted radiowaves with Rydberg atoms
• Static dc electric field orientation effects on two-photon Rydberg EIT
• RydIQule Version 2: Enhancing graph-based modeling of Rydberg atoms