Fig. 4. Subdiffusive transport on the superconducting qubit ladder with linear potential.

a Time evolution of autocorrelation function C_1,1(t) for the tilted qubit ladder with L = 12 and W_S/2π≤20 MHz. b is similar to (a) but for the data with W_S/2π≥24 MHz. Markers (lines) are experimental (numerical) data. c Transport exponent α as a function of W_S. For W_S/2π≤20 MHz and W_S/2π≥24 MHz, the exponent α is extracted from fitting the data of C_1,1(t) with the time window t ∈ [50 ns, 200 ns] and t ∈ [100 ns, 400 ns], respectively. Error bars (experimental data) and shaded regions (numerical data) represent the standard deviation.