In-situ magnetometry for experiments with atomic quantum gases

TL;DR

This paper introduces a simple in-situ magnetometry method for atomic quantum gases, enabling precise magnetic field monitoring without dedicated stabilization, using Rabi resonance sampling for accurate, real-time measurements.

Contribution

The authors present a novel, easily integrable in-situ magnetometry technique based on Rabi resonance sampling, applicable to various quantum-gas experiments without additional stabilization hardware.

Findings

Achieved Gauss-level bias field reconstruction with tens of microgauss accuracy.

Demonstrated millisecond time resolution in magnetic field measurements.

Validated the method with measurements of slow Rabi oscillations.

Abstract

Precise control of magnetic fields is a frequent challenge encountered in experiments with atomic quantum gases. Here we present a simple method for performing in-situ monitoring of magnetic fields that can readily be implemented in any quantum-gas apparatus in which a dedicated field-stabilization approach is not possible. The method, which works by sampling several Rabi resonances between magnetically field sensitive internal states that are not otherwise used in a given experiment, can be integrated with standard measurement sequences at arbitrary fields. For a condensate of $^{87}$Rb atoms, we demonstrate the reconstruction of Gauss-level bias fields with an accuracy of tens of microgauss and with millisecond time resolution. We test the performance of the method using measurements of slow resonant Rabi oscillations on a magnetic-field sensitive transition, and give an example for its use in experiments with state-selective optical potentials.