Spin shuttling offers a promising approach for developing scalable silicon-based quantum processors by addressing the connectivity limitations of quantum dots. In this work, we demonstrate high-fidelity bucket-brigade spin shuttling in a silicon MOS device, utilizing Pauli-spin-blockade readout. We achieve an average shuttling fidelity of \SI{99.8}{\percent}. The residual shuttling error is highly sensitive to the ratio between interdot tunnel coupling and Zeeman splitting, with tuning of these parameters enabling up to a 20-fold variation in error rate. An appropriate four-level Hamiltonian model supports our findings. These results provide valuable insights for optimizing high-performance spin-shuttling systems in future quantum architectures.
@article{arxiv.2507.15554,
title = {Interplay of Zeeman Splitting and Tunnel Coupling in Coherent Spin Qubit Shuttling},
author = {Ssu-Chih Lin and Paul Steinacker and MengKe Feng and Ajit Dash and Santiago Serrano and Wee Han Lim and Kohei M. Itoh and Fay E. Hudson and Tuomo Tanttu and Andre Saraiva and Arne Laucht and Andrew S. Dzurak and Hsi-Sheng Goan and Chih Hwan Yang},
journal= {arXiv preprint arXiv:2507.15554},
year = {2026}
}