For online events, details are sent out the week of the event. Join our community to receive them!

Nitrogen vacancy (NV) centers in diamond are versatile quantum sensors that can be used for high-sensitivity nanoscale magnetometry. Typically, they are used to measure averaged magnetic field values, without accessing nonlocal information like magnetic field correlations across space. In this talk, I will describe covariance magnetometry, a new method we have developed to measure dynamic field correlators, revealing nonlocal magnetic field information across space and time. I will first describe covariance magnetometry using optically resolvable NV centers, which acts as our foundational protocol for measuring two or more NV centers to detect the presence of correlations in fluctuating magnetic fields. I will then describe our recent efforts to scale this method up by performing massively multiplexed readout of many resolvable NV centers simultaneously using high-sensitivity cameras, giving us access to many two-point field correlators at once. Lastly, I will describe super-resolution covariance magnetometry, a new set of methods for detecting nanoscale field correlators below the optical diffraction limit. I will conclude the talk by describing entanglement-based super-resolution covariance magnetometry, in which we use NV center Bell pairs to perform covariance magnetometry with more than an order of magnitude higher sensitivity than is possible using conventional NV center spin readout.