Randomized benchmarking and process tomography for gate errors in a solid-state qubit

Understand

We present measurements of single-qubit gate errors for a superconducting qubit.

• Results from quantum process tomography and randomized benchmarking are compared with gate errors obtained from a double pi pulse experiment.
• Randomized benchmarking reveals a minimum average gate error of 1.1+/-0.3% and a simple exponential dependence of fidelity on the number of gates.
• It shows that the limits on gate fidelity are primarily imposed by qubit decoherence, in agreement with theory.