Fig. 3
Time and frequency domain analysis of T1 fluctuation. Statistical analysis of 2001 sequential T1 measurements of qubit A spanning a total measurement duration of 2.36 × 105 s. a Overlapping Allan deviation of T1 fluctuations. b Welch-method spectral density of T1 fluctuations. In both plots there are fits to the total noise (red line) which is formed of white noise (green lines) and two different Lorentzians (blue lines). The amplitudes and time constants of all noise processes are the same for both types of analysis. The error-bars of the Allan deviation correspond to 1 standard deviation. This data was taken during cooldown 2
