Simultaneous single-qubit driving of semiconductor spin qubits at the fault-tolerant threshold

Abstract

Practical Quantum computing hinges on the ability to control large numbers of qubits with high fidelity. Quantum dots define a promising platform due to their compatibility with semiconductor manufacturing. Moreover, high-fidelity operations above 99.9% have been realized with individual qubits, though their performance has been limited to 98.67% when driving two qubits simultaneously. Here we present single-qubit randomized benchmarking in a two-dimensional array of spin qubits, finding native gate fidelities as high as 99.992(1)%. Furthermore, we benchmark single qubit gate performance while simultaneously driving two and four qubits, utilizing a novel benchmarking technique called N-copy randomized benchmarking, designed for simple experimental implementation and accurate simultaneous gate fidelity estimation. We find two- and four-copy randomized benchmarking fidelities of 99.905(8)% and 99.34(4)% respectively, and that next-nearest neighbour pairs are highly robust to cross-talk errors. These characterizations of single-qubit gate quality are crucial for scaling up quantum information technology.

Main text 9 pages, 3 figures. Supp Info 21 pages, 7 figures, 8 tables

References in corpus (8)

• Supplementary information for "Quantum supremacy using a programmable superconducting processor"
• Surface codes: Towards practical large-scale quantum computation
• Randomized Benchmarking of Quantum Gates
• Fault-tolerant quantum computation with high threshold in two dimensions
• Universal control of a six-qubit quantum processor in silicon
• Characterization of addressability by simultaneous randomized benchmarking
• A single hole spin with enhanced coherence in natural silicon
• Site-selective quantum control in an isotopically enriched 28Si/SiGe quadruple quantum dot

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