Very sensitive vapor-cell quasi-DC atomic E-field sensor

• URL: http://arxiv.org/abs/2603.23751v1
• Date: Tue, 24 Mar 2026 22:18:42 GMT
• Title: Very sensitive vapor-cell quasi-DC atomic E-field sensor
• Abstract summary: vapor-cell atomic electrometer operating in quasi-DC frequency domain.<n>Noise floor for electric field (E-field) sensitivity ranging from 0.2 to 7.7 mV/m$sqrtrm Hz$ for a frequency band of 1--100 Hz.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We report several technical approaches that significantly improve the performance of a vapor-cell atomic electrometer operating in the quasi-DC frequency domain ($\ll$ 1 kHz). With a very small active volume of approximately 11 mm$^3$ inside the vapor cell, we demonstrated a noise floor for electric field (E-field) sensitivity ranging from 0.2 to 7.7 mV/m$\sqrt{\rm Hz}$ for a frequency band of 1--100 Hz. Our work utilizes only a bare vapor cell for electrometry, without any metal parts or electrodes, to ensure minimal distortion of the measured E-field and to minimize the effective sensing volume for high spatial resolution. The E-field-sensitive atomic state (Rydberg state) is excited and read out optically, maximizing the simplicity of the system design and enabling the miniaturization of quasi-DC E-field sensors for potential applications, such as diagnostics of electronics without physical contact, communications in and below the super-low frequency (SLF) band, proximity detection, remote activity surveillance, tracing charge signatures, and research in bioscience and geoscience.

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