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

• URL: http://arxiv.org/abs/2507.15554v1
• Date: Mon, 21 Jul 2025 12:33:55 GMT
• Title: Interplay of Zeeman Splitting and Tunnel Coupling in Coherent Spin Qubit Shuttling
• Authors: 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,
• Abstract summary: We demonstrate high-fidelity spin shuttling in a silicon MOS device, utilizing Pauli Spin Blockade (PSB) readout.<n>We achieve an average shuttling fidelity of SI99.8percent.
• Score: 0.29164840862014807
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Spin shuttling offers a promising approach for developing scalable silicon-based quantum processors by addressing the connectivity limitations of quantum dots (QDs). In this work, we demonstrate high-fidelity bucket-brigade (BB) spin shuttling in a silicon MOS device, utilizing Pauli Spin Blockade (PSB) 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 twenty-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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