Optically-biased Rydberg microwave receiver enabled by hybrid nonlinear interferometry

• URL: http://arxiv.org/abs/2403.05310v2
• Date: Sat, 29 Mar 2025 17:27:15 GMT
• Title: Optically-biased Rydberg microwave receiver enabled by hybrid nonlinear interferometry
• Authors: Sebastian Borówka, Mateusz Mazelanik, Wojciech Wasilewski, Michał Parniak,
• Abstract summary: The sensitivity of $176 mathrmnV/cm/sqrtHz$ and reliable operation up to $3.5 mathrmmV/cm$ of $13.9 mathrmGHz$ electric field are reported.<n>This approach is directly comparable to the state of the art superheterodyne, while retaining the merits of all-optical detection.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: The coupling of Rydberg vapors medium both to microwave and optical fields allows harnessing the merits of all-optical detection, e.g. weak disruption of the measured field and invulnerability to extremely strong fields, owing to the lack of conventional RF antenna in the detector. The trouble with this approach arises, as the greatest sensitivity is exhibited with the use of additional microwave field acting as a local oscillator, and the measurement can no longer be all-optical. Here we propose a different solution, optical-bias detection, that allows truly all-optical operation, while retaining exceptional sensitivity. We tackle the issue of laser phase noise, emerging in this type of detection, via a simultaneous measurement of the phase spectrum in a nonlinear process and real-time data processing, which overall yields an improvement of $35\ \mathrm{dB}$ in terms of signal-to-noise ratio compared with the basic approach. We report the sensitivity of $176\ \mathrm{nV/cm/\sqrt{Hz}}$ and reliable operation up to $3.5\ \mathrm{mV/cm}$ of $13.9\ \mathrm{GHz}$ electric field. This approach is directly comparable to the state of the art superheterodyne, while retaining the merits of all-optical detection.

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