Silicon spin qubits could play a major role in the future of quantum computing because they can be produced using the same semiconductor manufacturing methods that make today's computer chips. However, researchers have faced a significant challenge. When multiple silicon qubits are controlled at the same time, their operations tend to become less accurate. Building practical, large quantum computers will require scientists to control many qubits simultaneously while keeping errors to a minimum.
Researchers at the RIKEN Center for Emergent Matter Science and their collaborators have now made important progress toward solving this problem. In a study published in Nature Physics, the team demonstrated highly accurate control of several silicon spin qubits operating simultaneously. Their experiments used an array of five qubits connected to a shared microwave control line. By identifying a major cause of errors during simultaneous operation, the scientists developed a technique to reduce those errors and maintain precision.
Leon Camenzind, a RIKEN research scientist and co-first author who supervised the experiments, explains the significance of the results: "This shows that high-fidelity control can be maintained even when several qubits are operated at the same time and represents an important step toward scaling up silicon-based quantum processors."
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