Suppression of current source noise with an atomic magnetometer

Liang Shen; Rui Zhang; Teng Wu; Xiang Peng; Song Yu; Jingbiao Chen; Hong Guo

doi:10.1063/5.0009987

Suppression of current source noise with an atomic magnetometer

Rev Sci Instrum. 2020 Aug 1;91(8):084701. doi: 10.1063/5.0009987.

Authors

Liang Shen¹, Rui Zhang², Teng Wu², Xiang Peng², Song Yu¹, Jingbiao Chen², Hong Guo²

Affiliations

¹ Institute of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China.
² State Key Laboratory of Advanced Optical Communication Systems and Networks, Department of Electronics, and Center for Quantum Information Technology, Peking University, Beijing 100871, China.

PMID: 32872964
DOI: 10.1063/5.0009987

Abstract

This paper introduces a method for using an atomic magnetometer to suppress current source noise. In this method, the current noise is (i) suppressed with a lamp-pumped cesium atomic magnetometer and (ii) measured with a higher-sensitivity laser-pumped cesium atomic magnetometer. The current noise is compared before and after noise suppression at an output current of 50 mA, and the noise-suppression ratio is ∼27 dB. The noise-suppression performance can be enhanced by improving the sensitivity of the atomic magnetometer and the ability to restrain the ambient magnetic noise. This method has practical applications in metrology and fundamental physics research.