Correlated Randomized Benchmarking [article]

David C. McKay, Andrew W. Cross, Christopher J. Wood, Jay M. Gambetta
2020 arXiv   pre-print
To improve the performance of multi-qubit algorithms on quantum devices it is critical to have methods for characterizing non-local quantum errors such as crosstalk. To address this issue, we propose and test an extension to the analysis of simultaneous randomized benchmarking data -- correlated randomized benchmarking. We fit the decay of correlated polarizations to a composition of fixed-weight depolarizing maps to characterize the locality and weight of crosstalk errors. From these errors we
more » ... introduce a crosstalk metric which indicates the distance to the closest map with only local errors. We demonstrate this technique experimentally with a four-qubit superconducting device and utilize correlated RB to validate crosstalk reduction when we implement an echo sequence.
arXiv:2003.02354v1 fatcat:tl2sz4u7qzbyzgt5nedlwabzs4