Recently, a team at the Technical University Darmstadt in Germany has demonstrated for the first time a magnetometer based on a two-dimensional array of ultracold atoms with superior spatial resolution compared to classical devices. In this study, scientists trapped rubidium atoms in a square array with a width of 0.2 millimeters. They found that when this system is exposed to a magnetic field, it can detect spatial variations in the magnetic field, as each atom of the array acts as a separate sensor.