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The study reports that five silicon spin qubits can run single-qubit gates in parallel from one shared microwave line while keeping fidelities at or above 99.9%, a level the authors say meets the minimum for 2D surface-code error correction. The key technical contribution is a calibration method that compensates for AC-Stark-shift crosstalk, scaling as N(N-1) pairwise measurements. Readers should note that these results come from a five-qubit device, and whether the approach holds as arrays grow, and as two-qubit gates and error correction are added, remains to be shown.
RIKEN Demonstrates High-Fidelity Simultaneous Control of Silicon Spin Qubits Above 99.9% Threshold
Researchers at RIKEN and collaborators have achieved high-fidelity simultaneous control of five silicon spin qubits, maintaining over 99.9% accuracy. They overcame crosstalk caused by AC-Stark shifts through a new calibration protocol, enabling the use of a single microwave control line. This breakthrough meets the fault-tolerant threshold for quantum error correction and paves the way for more scalable quantum computers. The post RIKEN Demonstrates High-Fidelity Simultaneous Control of Silicon Spin Qubits Above 99.9% Threshold appeared first on Quantum Computing Report.
Five-qubit device. In a study published in Nature Physics, researchers from RIKEN, National Taiwan University, ETH Zurich, and TU Delft have demonstrated simultaneous high-fidelity single-qubit operations across a five-qubit silicon (28Si/SiGe) quantum dot array using a single, shared microwave control line. Detailed in the paper (“Simultaneous high-fidelity single-qubit gates in a spin qubit array“, the team identified…
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