SPICE Workshop on Quantum Spinoptics, June 18th - June 20th 2024
Jared Rovny
Nitrogen vacancy (NV) defect centers in diamond have been used as a versatile platform for nanoscale sensing of many condensed matter systems, but experiments have typically only taken advantage of a single NV center at a time or else performed widefield imaging, measuring the average local magnetic field 〈B(r,t)〉 but obtaining no nonlocal information about the relationship between the magnetic fields at two points separated in space or time, namely 〈B(r_1,t_1)B(r_2,t_2)〉. Understanding correlated dynamics is important for diagnosing many microscopic systems, and measurements of spatiotemporal correlations may provide useful information about the electron mean free path, signatures of hydrodynamic flow, or the nature of local NV center noise sources like surface spins. I will first describe our recently developed sensing technique allowing us to detect two-point correlators by simultaneous measurements of separate NV centers with micron spatial resolution and nanosecond temporal resolution. I will also discuss our recent progress extending this method to detect two-point correlators below the diffraction limit (< 100 nm), as well as a method to use NV-NV entanglement to detect nanoscale two-point correlators from noise.