Compressed Qubit Noise Spectroscopy: Piecewise-Linear Modeling and Rademacher Measurements
This work introduces two methods for qubit noise spectroscopy: using Total Generalized Variation (TGV) regularization to reconstruct complex, piecewise-linear noise spectra and Rademacher measurements to simplify experimental pulse sequences. Combining these techniques creates a robust method called CSR+TGV that accurately recovers both the sharp peaks and the broad background in realistic quantum systems like InAs/GaAs quantum dots.