Three-Qubit Randomized Benchmarking

As quantum circuits increase in size, it is critical to establish scalable multiqubit fidelity metrics. Here we investigate, for the first time, three-qubit randomized benchmarking (RB) on a quantum device consisting of three fixed-frequency transmon qubits with pairwise microwave-activated interact...

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Bibliographic Details
Published in:Physical review letters 2019-05, Vol.122 (20), p.200502-200502, Article 200502
Main Authors: McKay, David C, Sheldon, Sarah, Smolin, John A, Chow, Jerry M, Gambetta, Jay M
Format: Article
Language:English
Subjects:
Benchmarks
Error analysis
Qubits (quantum computing)
Randomization
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Summary:As quantum circuits increase in size, it is critical to establish scalable multiqubit fidelity metrics. Here we investigate, for the first time, three-qubit randomized benchmarking (RB) on a quantum device consisting of three fixed-frequency transmon qubits with pairwise microwave-activated interactions (cross-resonance). We measure a three-qubit error per Clifford of 0.106 for all-to-all gate connectivity and 0.207 for linear gate connectivity. Furthermore, by introducing mixed dimensionality simultaneous RB-simultaneous one- and two-qubit RB-we show that the three-qubit errors can be predicted from the one- and two-qubit errors. However, by introducing certain coherent errors to the gates, we can increase the three-qubit error to 0.302, an increase that is not predicted by a proportionate increase in the one- and two-qubit errors from simultaneous RB. This demonstrates the importance of multiqubit metrics, such as three-qubit RB, on evaluating overall device performance.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.122.200502