Non-Gaussian Noise Spectroscopy with Spin Qubits

The use of highly sensitive spin-qubits, such as nitrogen-vacancy defects in diamond, has enabled the study of magnetic noise in two-dimensional materials at nanometer scale spatial resolution. Since magnetic noise originates from thermal and quantum fluctuations of the spin density and electronic current in the material, by studying the frequency and distance dependence of this noise we have been able to learn much about the linear response spectra of these materials. In this talk, I will show how these techniques can theoretically be extended to allow for the study of higher-order correlations amongst the magnetic noise, and therefore probe nonlinear correlation functions of these two-dimensional materials. I will demonstrate how both non-Markovian correlations as well as non-local spatial correlations are accesible, and provide a simple example to illustrate the power of this method.