MilestoneHardwareConfirmed

Three teams push silicon qubit gates past 99% accuracy

Jun 6, 2021

Three teams report silicon qubit gates above 99% accuracy: Mądzik and colleagues at UNSW in June 2021, Xue and colleagues at QuTech in July, and Noiri and colleagues at RIKEN in August. Each demonstrates both one- and two-qubit gates above this benchmark.

Why it matters

Silicon qubits can draw on the chip industry’s manufacturing experience; reliable one- and two-qubit gates bring them closer to the accuracy needed to correct errors as a computation runs.

Mateusz T. Mądzik · Xiao Xue · Akito Noiri · UNSW Sydney · QuTech · RIKEN

See it on the timeline

UNSW researchers report a two-qubit logic gate in silicon (Nov 21, 2014)
QuTech operates a six-qubit silicon processor (Feb 18, 2022)

Sources (3)

arXiv (Mądzik et al.) Precision tomography of a three-qubit electron-nuclear quantum processor in silicon
Primary sourceJun 6, 2021

“yielding one-qubit gate fidelities up to 99.93(3)% and a two-qubit gate fidelity of 99.21(14)%.”
arXiv (Xue et al.) Computing with spin qubits at the surface code error threshold
Primary sourceJul 1, 2021

“Here we report a spin-based quantum processor in silicon with single- and two-qubit gate fidelities all above 99.5%, extracted from gate set tomography.”
arXiv (Noiri et al.) Fast universal quantum control above the fault-tolerance threshold in silicon
Primary sourceAug 5, 2021

“two-qubit gate fidelity of 99.5 per cent, along with single-qubit gate fidelities of 99.8 per cent”

Added Oct 24, 2026 · Updated Oct 24, 2026. Spotted an error? Tell us and we will review it.

Three teams push silicon qubit gates past 99% accuracy

Why it matters

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