Interplay of Zeeman splitting and tunnel coupling in coherent spin-qubit shuttling
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.
Authors
- Kohei M. Itoh (ORCID: https://orcid.org/0000-0002-8153-4893)
- Hsi‐Sheng Goan (ORCID: https://orcid.org/0000-0001-8117-5846)
- Arne Laucht (ORCID: https://orcid.org/0000-0001-7892-7963)
- Chih Hwan Yang (ORCID: https://orcid.org/0000-0002-8713-150X)
- Andrew S. Dzurak (ORCID: https://orcid.org/0000-0003-1389-5096)
- Ajit Dash (ORCID: https://orcid.org/0000-0003-4033-4614)
- Wee Han Lim (ORCID: https://orcid.org/0000-0002-8821-2758)
- MengKe Feng (ORCID: https://orcid.org/0000-0002-8894-7383)
- Fay E. Hudson (ORCID: https://orcid.org/0000-0003-0134-3657)
- Tuomo Tanttu (ORCID: https://orcid.org/0000-0002-2832-3237)
- André Saraiva (ORCID: https://orcid.org/0000-0002-7209-9180)
- Paul Steinacker (ORCID: https://orcid.org/0009-0000-6515-2513)
- Santiago Serrano (ORCID: https://orcid.org/0000-0002-3950-1174)
- S. H. Lin
Institutions
- National Taiwan University (TW)
- Keio University (JP)
- Shaqra University (SA)
- UNSW Sydney (AU)
- National Center for Theoretical Sciences (TW)
- National Center for Theoretical Sciences, Physics Division
Publication Details
- Journal
- Physical Review Applied
- Published
- 2026-01-08
- DOI
- https://doi.org/10.1103/3d1t-pr7m
- Primary Topic
- Quantum and electron transport phenomena
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Australian National Fabrication Facility
- National Taiwan University
- National Science and Technology Council
- U.S. Air Force
- Air Force Office of Scientific Research
- Army Research Office