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RIKEN researchers have successfully mitigated control errors in silicon spin qubit arrays by implementing a shared microwave line calibration method, achieving gate fidelities exceeding 99.9% across five simultaneous qubits. This advancement addresses a critical scalability hurdle for semiconductor-compatible quantum processors, demonstrating that high-accuracy parallel operations are feasible despite inherent coherence losses at higher power levels.
RIKEN Team Improves Parallel Control of Silicon Spin Qubits
Insider Brief PRESS RELEASE — Silicon spin qubits are a promising platform for building scalable quantum computers as they are compatible with the semiconductor manufacturing technologies used to produce today’s computer chips. However, they have an important weakness: silicon spin qubits typically lose accuracy when several qubits are under parallel control. To be useful, quantum […]
RIKEN researchers demonstrated high-accuracy parallel control of silicon spin qubits using a shared microwave line and a calibration method that reduces control errors. Pairwise phase calibrations helped maintain gate fidelities above 99.99% when operating up to three qubits simultaneously and approximately 99.9% across all five. Increased microwave power caused remaining losses in quantum coherence, identifying a limitation that further device improvements could help address. Image: Rendered illustration of five silicon spin qubits…
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