Continuous-frequency weak electric field measurement with Rydberg atoms

Abstract

We demonstrate a continuous frequency electric field measurement based on the far off-resonant AC stark effect in a Rydberg atomic vapor cell. In this configuration, a strong far off-resonant field, denoted as a local oscillator (LO) field, acts as a gain shifting the Rydberg level to a high sensitivity region. An incident weak signal field with a few hundreds of kHz difference from the LO field is mixed with the LO field in Rydberg system to generate an intermediate frequency (IF) signal, which is read out by the Rydberg electromagnetically induced transparency (Rydberg-EIT) spectroscopy. Not like resonant EIT-AT spectra, we realize the electric field measurement of the signal frequency from 2 GHz to 5 GHz using a single Rydberg state. A minimum detectable filed strength is down to 2.31~$\mu$V/cm and a linear dynamic range is over 65~dB. The minimum detectable filed is comparable with a resonant microwave-dressed Rydberg heterodyne receiver using the same system, which is 1.45~$\mu$V/cm. We also show the system has an inherent polarization selectivity feature. Our method can provide a high sensitivity of electric field measurement and be extended to arbitrary frequency measurements.

5 pages, 4 figures

References in corpus (8)

• Sub-Wavelength Imaging and Field Mapping via EIT and Autler-Townes Splitting In Rydberg Atoms
• Waveguide-coupled Rydberg spectrum analyzer from 0 to 20 GHz
• Modulation transfer spectroscopy in atomic rubidium
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• Improvement of response bandwidth and sensitivity of Rydberg Receiver using multi-channel excitations
• RydIQule: A Graph-based Paradigm for Modelling Rydberg and Atomic Systems
• Polarization-insensitive microwave electrometry using Rydberg atoms
• Dissipative stabilization of high-dimensional GHZ states for neutral atoms
• Distant RF field sensing with a passive Rydberg-atomic transducer
• Detection of HF and VHF Fields through Floquet Sideband Gaps by `Rabi Matching' Dressed Rydberg Atoms
• Continuous broadband Rydberg receiver using AC Stark shifts and Floquet States
• Optically-biased Rydberg microwave receiver enabled by hybrid nonlinear interferometry
• Two-dimensional imaging of electromagnetic fields via light sheet fluorescence imaging with Rydberg atoms
• Fisher information analysis on quantum-enhanced parameter estimation in electromagnetically-induced-transparency spectrum with single photons
• Observation of electric field induced superradiance slowdown in ultracold Rydberg atomic gases