Title: Massively multiplexed covariance magnetometry with diamond quantum sensors

Abstract: Nitrogen vacancy (NV) centers in diamond enable high-sensitivity magnetometry of condensed matter systems with nanoscale resolution, but conventional measurements report on averaged local magnetic fields, limiting understanding of non-local dynamics. Our group recently developed covariance magnetometry which leverages multiple quantum sensors to measure temporal dynamics of the magnetic field at many positions simultaneously, from which the local noise spectrum and non-local properties such as correlation functions can be computed. In this talk, I will discuss two platforms for scaling up these measurements for multiplexed covariance magnetometry: in the first, we use structured illumination and a high-sensitivity camera to simultaneously measure many individually resolvable NV centers with high-fidelity, enabling correlation measurements with nanoscale-precision. In the second platform, we use high-density ensembles of NV centers for high-sensitivity correlation measurements at the cost of micron-scale spatial resolution. By applying super-resolution techniques, we gain access to increased spatial resolution, pushing the sensitivity of ensembles towards the spatial precision enabled by individual centers. Our ongoing efforts involve applying these platforms to study dynamical fluctuations of low-dimensional superconductors and layered antiferromagnetic materials, allowing access to fluctuations at many momenta without changing the sensor-sample distance.

Lunch will be provided at 12:30 PM in EQuad J401.