Multi-qubit Randomized Benchmarking Using Few Samples

Understand

Randomized benchmarking (RB) is an efficient and robust method to characterize gate errors in quantum circuits.

• Averaging over random sequences of gates leads to estimates of gate errors in terms of the average fidelity.
• These estimates are isolated from the state preparation and measurement errors that plague other methods like channel tomography and direct fidelity estimation.
• A decisive factor in the feasibility of randomized benchmarking is the number of sampled sequences required to obtain rigorous confidence intervals.