npj Quantum Information

Researchers at the University of Osaka developed an “orbital band engineering” approach that adds an auxiliary quantum dot to semiconductor spin qubits. Electrically tuning the extra dot helped balance fast operation with resistance to electrical noise, two properties that normally compete. Combined with machine-learning-based frequency correction, the method enabled fast, high-fidelity qubit control and could provide a useful strategy for post-fabrication tuning and scaling of semiconductor quantum computers.