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Silicon-qubit test demonstrates 99.9% fidelity with shared microwave control

Researchers from RIKEN and collaborating institutions operated five electron-spin qubits in a silicon/silicon-germanium device through a single microwave control line. The team used pairwise measurements to compensate for crosstalk associated with AC Stark shifts, avoiding separate calibration for every possible qubit combination.

Individual qubits achieved gate fidelities above 99.99%, while simultaneous operation of all five maintained fidelity at or above 99.9%. The approach could reduce control-connection requirements in larger processors, although the article describes modules of roughly ten qubits per shared line as a future goal rather than a demonstrated result. The study was published in Nature Physics. Source: Interesting Engineering, https://interestingengineering.com/science/silicon-spin-qubits-higher-accuracy