Process verification of two-qubit quantum gates by randomized benchmarking

A. D. Córcoles, Jay M. Gambetta, Jerry M. Chow, John A. Smolin, Matthew Ware, Joel Strand, Britton Plourde, M. Steffen

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Abstract

We implement a complete randomized benchmarking protocol on a system of two superconducting qubits. The protocol consists of randomizing over gates in the Clifford group, which experimentally are generated via an improved two-qubit cross-resonance gate implementation and single-qubit unitaries. From this we extract an optimal average error per Clifford operation of 0.0936. We also perform an interleaved experiment, alternating our optimal two-qubit gate with random two-qubit Clifford gates, to obtain a two-qubit gate error of 0.0653. We compare these values with a two-qubit gate error of ∼0.12 obtained from quantum process tomography, which is likely limited by state preparation and measurement errors.

Original languageEnglish (US)
Article number030301
JournalPhysical Review A
Volume87
Issue number3
DOIs
StatePublished - Mar 19 2013

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ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Córcoles, A. D., Gambetta, J. M., Chow, J. M., Smolin, J. A., Ware, M., Strand, J., Plourde, B., & Steffen, M. (2013). Process verification of two-qubit quantum gates by randomized benchmarking. Physical Review A, 87(3), [030301]. https://doi.org/10.1103/PhysRevA.87.030301