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 neighbor pairs are highly robust to cross-talk errors. These characterizations of single-qubit gate quality are crucial for scaling up quantum information technology.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jun 19, 2023
- Source ID
- 10.1038/s41467-023-39334-3
Entities
People
- A. Sammak
- F. van Riggelen
- Giordano Scappucci
- Jonas Helsen
- M. Rimbach-russ
- Menno Veldhorst
- N W Hendrickx
- Sander L. de Snoo
- William Lawrie