Science1 hOctober 18, 2026, 21:02

Single microwave line drives five silicon spin qubits at 99.9% fidelity

Researchers at RIKEN and collaborators operated five silicon spin qubits through a single microwave control line while keeping gate fidelity at or above 99.9%. They traced the interference to the AC Stark shift and compensated for it using pairwise calibrations. The study was published in Nature Physics.

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Single microwave line drives five silicon spin qubits at 99.9% fidelity

Five electron-spin qubits in a silicon/silicon-germanium device share one control line
With all five operating in parallel, gate fidelities stay at or above 99.9%
Interference traced to the AC Stark shift and offset via pairwise calibration
The approach could enable modules of about ten qubits per shared line

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Single microwave line drives five silicon spin qubits at 99.9% fidelity

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