A Three-Photon Rydberg Atom-Based Radio Frequency Sensing Scheme with Narrow Linewidth

Stephanie M. Bohaichuk; Fabian Ripka; Vijin Venu; Florian Christaller; Chang Liu; Matthias Schmidt; Harald Kübler; James P. Shaffer

arXiv · 2304.07409

A Three-Photon Rydberg Atom-Based Radio Frequency Sensing Scheme with Narrow Linewidth

Stephanie M. Bohaichuk·Fabian Ripka·Vijin Venu·Florian Christaller·Chang Liu·Matthias Schmidt·Harald Kübler·James P. Shaffer

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Abstract

We demonstrate Rydberg atom-based radio frequency sensing with a colinear three-photon scheme in a room temperature cesium vapor cell that minimizes residual Doppler broadening of the probe laser absorption feature. A sub-200 kHz spectral linewidth is observed and extends the self-calibrated Autler-Townes sensing regime to weaker fields by a factor of ~18 compared to the theoretical limit of the most commonly used two-photon scheme. The sensitivity of the method to microsecond pulses is shown to be sufficient to detect radio frequency Rabi frequencies of 2$\pi$ x 0.44 MHz using a 480 kHz bandwidth at 108.9 GHz, demonstrating the ability to sense time-dependent signals suitable for radar and communications.

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Stephanie M. Bohaichuk, Fabian Ripka, Vijin Venu, Florian Christaller, Chang Liu, Matthias Schmidt, Harald Kübler, James P. Shaffer. 2023-04-14. A Three-Photon Rydberg Atom-Based Radio Frequency Sensing Scheme with Narrow Linewidth. https://arxiv.org/abs/2304.07409

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