Calibration of Coherent Errors using Different Gatesets

Achieving fault tolerant operation of a quantum processor requires creating high-fidelity qubit gates. We study the impact of coherent errors from phase evolution of the control waveform on gate fidelity for several gatesets, using randomized benchmarking (RB) and gateset tomography (GST) protocols to find the error per physical gate and angle error between gates. The undesired phase distortion rotates the effective axes of rotation off of the Bloch sphere equatorial plane. Our results show that gateset choice when performing RB and GST can obfuscate or amplify the error between axes. Predistortion of the signal can reverse the effects of the phase evolution, rotating the effective axes of rotation back to their desired positions and improving the fidelity of the resulting gates.