Fig. 2: Qubit frequency and DC voltage log.

A log of all six qubit frequencies (plotted in MHz deviations from the mean) and DC gate voltage settings in the linear device across a span of 912 days (from 24th Jan 2022–24th July 2024). The data points for the qubit frequencies are extracted from frequency scans as shown in Fig. 1c (see main text). Some days feature multiple data points whereas for other days none are recorded. Any time a frequency data point is plotted for at least one of the qubits, the gate voltage settings for the entire array are included in the plot as well. The four gray regions indicate periods when the fridge underwent a thermal cycle. The 16 red regions indicate periods of longer than seven days when no gate voltage was changed by more than 15 µV. The gates are labeled according to Fig. 1a. The tickmarks on the horizontal axis are positioned in the middle of the month. This dataset forms the basis for further analysis in subsequent figures.