Quantum

RIKEN Team Improves Parallel Control of Silicon Spin Qubits

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Briefings

RIKEN researchers successfully demonstrated high-fidelity parallel control of five silicon spin qubits using a shared microwave line and pairwise phase calibration. The study, published in Nature Physics, achieved gate fidelities above 99.99% for individual qubits and 99.9% when operating up to three simultaneously, with fidelity remaining near 99.9% for all five. Key limitations identified include AC Stark shift-induced phase errors and microwave power-induced decoherence. The findings support shared control lines as a practical path toward scaling silicon-based quantum processors, though further device improvements are needed to mitigate decoherence losses.

Key points

• RIKEN researchers achieved gate fidelities above 99.99% for individual silicon spin qubits using a shared microwave line and pairwise phase calibration.
• Parallel operation of up to three qubits maintained fidelities above 99.9%, while all five qubits maintained approximately 99.9% fidelity.

Context

This breakthrough addresses a critical weakness in silicon spin qubits: accuracy degradation when multiple qubits operate simultaneously. By using pairwise phase calibrations to compensate for AC Stark shifts, the team enables scalable quantum computing on semiconductor-compatible platforms.

Limitations

The study identifies AC Stark shift and microwave power-induced decoherence as remaining error sources. Further device improvements are required to mitigate decoherence losses, and the research remains in progress.

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