A 300 mm foundry silicon spin qubit unit cell exceeding 99 % fidelity in all operations
ORAL
Abstract
Fabrication of quantum processors in advanced 300 mm wafer-scale complementary metal–oxide–semiconductor (CMOS) foundries provides a unique scaling pathway towards commercially viable quantum computing with potentially millions of qubits on a single chip. We will present the latest on the precise qubit operation of a silicon two-qubit devices made in a 300 mm semiconductor processing line. The key metrics including single- and two qubit control fidelities exceed 99 % and state preparation and measurement fidelity exceeds 99.9 %, as evidenced by gate set tomography (GST). Next to the benchmarking we will discuss the fidelity limiting factors and outlook for foundry-made silicon spin qubits. Our results answer the longstanding question whether the favourable properties including high-fidelity operation and long coherence times can be preserved when transitioning from a tailored academic to an industrial semiconductor fabrication technology.
*We acknowledge support from the Australian Research Council (FL190100167). P. S. and A. N. acknowledge support from the Sydney Quantum Academy. P. S. acknowledges support from the Baxter Charitable Foundation.
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Publication:Steinacker, P. & Dumoulin Stuyck, N., Lim, W. H., Tanttu, T., Feng, M., Nickl, A., Serrano, S., Candido, M., Cifuentes, J. D., Hudson, F. E., Chan, K. W., Kubicek, S., Jussot, J., Canvel, Y., Beyne, S., Shimura, Y., Loo, R., Godfrin, C., Raes, B., … Dzurak, A. S. (2024). A 300 mm foundry silicon spin qubit unit cell exceeding 99% fidelity in all operations (Version 1). arXiv. https://doi.org/10.48550/ARXIV.2410.15590 N. Dumoulin Stuyck et al., Demonstration of 99.9% single qubit control fidelity of a silicon quantum dot spin qubit made in a 300 mm foundry process, 2024 IEEE Silicon Nanoelectronics Workshop (SNW) 11 (2024).
