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Characterization of addressability by simultaneous randomized benchmarking

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arxiv 1204.6308 v2 pith:4LPNR4MH submitted 2012-04-27 quant-ph cond-mat.mes-hallcond-mat.supr-con

classification quant-phcond-mat.mes-hallcond-mat.supr-con
keywords addressabilityamountbenchmarkingcross-talkinformationinteractionsprotocolrandomized
verification ladder T0 review T1 audit T2 compute T3 formal
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The control and handling of errors arising from cross-talk and unwanted interactions in multi-qubit systems is an important issue in quantum information processing architectures. We introduce a benchmarking protocol that provides information about the amount of addressability present in the system and implement it on coupled superconducting qubits. The protocol consists of randomized benchmarking each qubit individually and then simultaneously, and the amount of addressability is related to the difference of the average gate fidelities of those experiments. We present the results on two similar samples with different amounts of cross-talk and unwanted interactions, which agree with predictions based on simple models for the amount of residual coupling.

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