Process verification of two-qubit quantum gates by randomized benchmarking

By A. C'orcoles, Jay M. Gambetta, Jerry M. Chow, John A. Smolin, M. Ware, J. D. Strand, B. Plourde, Matthias Steffen. 2012

188 citations recorded by the source corpus.

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 $\ensuremath{\sim}0.12$ obtained from quantum process tomography, which is likely limited by state preparation and measurement errors.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/897bf87d5f69568b84fd880fa40832cbfe45e64b

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In Artificial Intelligence

In Atomic and Molecular Physics, and Optics

Citations in the corpus

Supervised learning with quantum-enhanced feature spaces (2018, methodology): “We experimentally veriﬁed our single-and two-qubit unitaries by Randomized Benchmarking (RB) [39, 40] Our two-qubit unitarias are CNOTs constructed from echo cross-resonance sequences [40, 41].”
Realization of High-Fidelity CZ and ZZ -Free iSWAP Gates with a Tunable Coupler (2020, methodology): “[42, 44], we construct the two-qubit Clifford group, which has four distinct classes as shown in Fig.”
High-Fidelity, Frequency-Flexible Two-Qubit Fluxonium Gates with a Transmon Coupler (2023, methodology): “After calibration, we extract the gate fidelity by performing Clifford interleaved randomized benchmarking, averaging over 20 different randomizations [12, 40, 41].”
Suppression of Crosstalk in Superconducting Qubits Using Dynamical Decoupling (2021, methodology): “The Quito CNOT gate is based on the “echo cross-resonance” (CR) gate [45], which consists of two CR pulses on the control qubit, two rotary pulses on the target qubit [46], and several single qubit gates.”