Experimental Realization of Noise Injection using SchWARMA

We develop a noise-injection scheme applied to an experimental qubit system in order to validate protocols that characterize and mitigate noise. We use a technique known as Schrodinger Wave Autoregressive Moving Average (SchWARMA) to mimic phase noise on a qubit. This is realized by imparting SchWARMA generated errors on the phase of the RF drive that is used to generate control pulses. The accumulation of phase errors mimics dephasing a qubit might experience relative to a perfect drive. We use quantum noise spectroscopy techniques to perform spectral estimation of the noise power spectrum and evaluate the efficacy of the noise injection approach. Our results show SchWARMA is a powerful tool for mimicking correlated phase noise processes in a superconducting qubit system. The power of SchWARMA can be shown to go beyond our initial experiments, extending to multi-axis noise models and arbitrary qubit systems.