Investigation on the Effects of Microvibration on the Atomic Comagnetometer.

Precision measurements utilizing atomic spins are widely used in fundamental physics research, inertial sensing, biomagnetism, and the generation of standard quantities. These precision measurements based on quantum sensors have long been disturbed by microvibration. In this work, we study the influence of microvibration on spin ensembles and perform the experiment on an atomic comagnetometer for the first time, which is a powerful tool for searching for dark matter and new force, as well as inertial navigation. The model of the effects of microvibration on the atomic comagnetometer is established, which considers the transfer characteristics of microvibration and the response characteristics of the atomic spin ensembles to the vibration. Moreover, we develop a vibration isolation system, which is a combination of air-floating passive vibration isolators and active feedback systems, to suppress the influence of microvibration. Based on the established model and the vibration isolator, we achieve an ultrahigh sensitive comagnetometer, which is among the most sensitive comagnetometer. This work is of wide interest in precision measurement based on quantum sensors and could pave the way for the design of combined vibration isolation systems for such experiments to further improve the sensitivity.