Operating semiconductor quantum processors with hopping spins
Abstract
Qubits that can be efficiently controlled are essential for the development of scalable quantum hardware. While resonant control is used to execute high-fidelity quantum gates, the scalability is challenged by the integration of high-frequency oscillating signals, qubit crosstalk and heating. Here, we show that by engineering the hopping of spins between quantum dots with site-dependent spin quantization axis, quantum control can be established with discrete signals. We demonstrate hopping-based quantum logic and obtain single-qubit gate fidelities of 99.97\%, coherent shuttling fidelities of 99.992\% per hop, and a two-qubit gate fidelity of 99.3\%, corresponding to error rates that have been predicted to allow for quantum error correction. We also show that hopping spins constitute a tuning method by statistically mapping the coherence of a 10-quantum dot system. Our results show that dense quantum dot arrays with sparse occupation could be developed for efficient and high-connectivity qubit registers.
Cite
@article{arxiv.2402.18382,
title = {Operating semiconductor quantum processors with hopping spins},
author = {Chien-An Wang and Valentin John and Hanifa Tidjani and Cécile X. Yu and Alexander S. Ivlev and Corentin Déprez and Floor van Riggelen-Doelman and Benjamin D. Woods and Nico W. Hendrickx and William I. L. Lawrie and Lucas E. A. Stehouwer and Stefan D. Oosterhout and Amir Sammak and Mark Friesen and Giordano Scappucci and Sander L. de Snoo and Maximilian Rimbach-Russ and Francesco Borsoi and Menno Veldhorst},
journal= {arXiv preprint arXiv:2402.18382},
year = {2024}
}
Comments
main text with 18 pages and 3 figures, supplementary materials with 64 pages and 26 figures, in a single file