Kavli Affiliate: Giordano Scappucci
| First 5 Authors: Yi-Hsien Wu, Yi-Hsien Wu, , ,
| Summary:
Silicon spin qubits are a promising platform for scalable quantum computing
due to their compatibility with industrial semiconductor fabrication and the
recent scaling to multi-qubit devices. Control fidelities above the 99%
fault-tolerant threshold are routinely achieved, but extending high-fidelity
control to simultaneous multi-qubit operation remains a major challenge. We
demonstrate high-fidelity, fully parallel control of five silicon spin qubits
using a single shared microwave line. Using tailored control pulses, all qubits
achieve primitive $pi/2$ gate fidelities well above 99.99%, with some
approaching 99.999%, exceeding previously reported fidelities in silicon spin
qubits. These fidelities are mostly preserved during simultaneous operation of
up to three qubits, and remain at the practical fault-tolerant threshold of
99.9% even during fully parallel five-qubit operation. This performance is
enabled by a calibration scheme that compensates drive-induced phase shifts
using only pairwise calibrations, scaling quadratically with qubit number and
avoiding exponential overhead. By reducing the number of impedance-controlled
microwave lines, our approach addresses a key architectural bottleneck and
offers a scalable control strategy for high-fidelity operation in large spin
qubit arrays.
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