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arXiv · 2507.15554

Interplay of Zeeman Splitting and Tunnel Coupling in Coherent Spin Qubit Shuttling

Ssu-Chih Lin·Paul Steinacker·MengKe Feng·Ajit Dash·Santiago Serrano·Wee Han Lim·Kohei M. Itoh·Fay E. Hudson·Tuomo Tanttu·Andre Saraiva·Arne Laucht·Andrew S. Dzurak·Hsi-Sheng Goan·Chih Hwan Yang
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Abstract

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.

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Ssu-Chih Lin, Paul Steinacker, MengKe Feng, Ajit Dash, Santiago Serrano, Wee Han Lim, Kohei M. Itoh, Fay E. Hudson, Tuomo Tanttu, Andre Saraiva, Arne Laucht, Andrew S. Dzurak, Hsi-Sheng Goan, Chih Hwan Yang. 2025-07-21. Interplay of Zeeman Splitting and Tunnel Coupling in Coherent Spin Qubit Shuttling. https://doi.org/10.1103/3d1t-pr7m

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