Fig. 4: Two-qubit performance.
From: High-fidelity spin qubit operation and algorithmic initialization above 1 K
a, DCZ oscillations at B0 = 0.79 T, T = 0.1 K and 1 K. The visibility is limited by microwave-induced noise46, J gate pulsing, and the use of only partial algorithmic initialization. b, Two-qubit randomized benchmarking at B0 = 0.79 T, T = 0.1 K and 1 K. c, Breakdown of error channels using pyGSTi (ref. 59), based on the final FBT error generators at B0 = 0.79 T, T = 0.1 K and 1 K, with the error magnitudes plotted towards the left and their contributed infidelities plotted towards the right. Each sub-figure includes the five largest contributing channels for both Hamiltonian (blue) and stochastic (gold) errors, respectively. We note that Hamiltonian errors contribute to the infidelity in second order, but stochastic errors contribute in first order60. Common error channels are labelled with their physical interpretations. Error bars represent the 95% confidence level.
