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 to learn the spatial structure and time-varying nature of the noise. This technique, which relies on tracking tiny fluctuations in magnetic fields, represents a stark improvement over previous methods that averaged many separate measurements. They demonstrated measurements of correlated applied noise using spin-to-charge readout of two NV centers and implemented a spectral reconstruction protocol for disentangling local and nonlocal noise sources…read more. TECHNICAL ARTICLEÂ
… have developed a technique to measure noise in a material by studying correlations…Credit: David Kelly Crow