Phys.org  December 23, 2022 Nitrogen vacancy (NV) centers in diamond can be used to sense magnetic fields with high sensitivity and spatial resolution. Typically, the magnetic field is measured by averaging sequential measurements of single NV centers, or by spatial averaging over ensembles of many NV centers, which provides mean values that contain no nonlocal information about the relationship between two points separated in space or time. A team of researchers in the US (Princeton University, University of Wisconsin) used specially designed diamonds to develop a technique to measure noise in a material by studying correlations and used this information […]