RIKEN Demonstrates High-Fidelity Simultaneous Control of Silicon Spin Qubits Above 99.9% Threshold - Quantum Computing Report
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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 AC-Stark shifts as the main source of parallel drive crosstalk and introduced an N(N-1) pairwise calibration protocol that preserves gate fidelities above 99.9% during simultaneous 5-qubit operation.
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