Spin-Echo-Based Magnetometry with Spinor Bose-Einstein Condensates

TL;DR

This paper demonstrates a sensitive method for detecting weak AC magnetic fields using spin echo techniques on spinor Bose-Einstein condensates, achieving high spatial resolution and noise suppression.

Contribution

The study introduces a novel application of spin echo to Bose-Einstein condensates for precise magnetic field sensing with noise mitigation.

Findings

Achieved 12 pT/Hz^1/2 magnetic field sensitivity.

Suppressed power line frequency noise with reverse phase magnetic field.

Demonstrated spatial resolution of 99 μm^2.

Abstract

We demonstrate detection of a weak alternate-current magnetic field by application of the spin echo technique to F = 2 Bose-Einstein condensates. A magnetic field sensitivity of 12 pT/Hz^1/2 is attained with the atom number of 5*10^3 at spatial resolution of 99 \mu m^2. Our observations indicate magnetic field fluctuations synchronous with the power supply line frequency. We show that this noise is greatly suppressed by application of a reverse phase magnetic field. Our technique is useful in order to create a stable magnetic field environment, which is an important requirement for atomic experiments which require a weak bias magnetic field.