{
  "abstract": "Electron spins in silicon offer a promising path toward scalable, fault-tolerant quantum computing, with the potential to host millions of qubits. However, scaling up dense quantum-dot arrays and enabling qubit interconnections through shuttling are hindered by uncontrolled lateral variations of the valley splitting energy E VS . We map E VS across a 40 nm × 400 nm region of a 28 Si/Si 0.7 Ge 0.3 shuttle device and analyze the spin coherence of a single electron spin transported by conveyor-belt shuttling. We observe that the E VS varies over a wide range from 1.5 μeV to 200 μeV and is dominated by SiGe alloy disorder. In regions of low E VS and at spin-valley resonances, spin coherence is reduced and its dependence on shuttle velocity matches predictions. Rapid and frequent traversal of low- E VS regions induces a regime of enhanced spin coherence explained by motional narrowing. By selecting shuttle trajectories that avoid problematic areas on the E VS map, we achieve transport over tens of microns with coherence limited by the coupling to a static electron spin entangled with the mobile qubit. Our results provide experimental confirmation of the theory of spin decoherence of mobile electron spin-qubits and present practical strategies to integrate conveyor-mode qubit shuttling into silicon quantum chips.",
  "abstract_shown": true,
  "affiliations": [
    "JARA-FIT Institute for Quantum Information, Forschungszentrum Jülich GmbH and RWTH Aachen University, Aachen, Germany",
    "Helmholtz Nano Facility (HNF), Forschungszentrum Jülich, Jülich, Germany",
    "QuTech and Kavli Institute of Nanoscience, Delft University of Technology, Delft, The Netherlands",
    "Institute of Physics, Polish Academy of Sciences, Warsaw, Poland",
    "JARA-FIT Institute for Quantum Information, Forschungszentrum Jülich GmbH and RWTH Aachen University, Aachen, Germany. lars.schreiber@physik.rwth-aachen.de"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 10,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "M. Volmer",
      "orcid": "0009-0007-8461-3099"
    },
    {
      "affs": [
        0
      ],
      "name": "Tom Struck"
    },
    {
      "affs": [
        0
      ],
      "name": "Arnau Sala"
    },
    {
      "affs": [
        1
      ],
      "name": "Jhih‐Sian Tu",
      "orcid": "0000-0003-3359-0310"
    },
    {
      "affs": [
        1
      ],
      "name": "Stefan Trellenkamp",
      "orcid": "0000-0003-1049-4414"
    },
    {
      "affs": [
        2
      ],
      "name": "Davide Degli Esposti",
      "orcid": "0000-0003-2275-8288"
    },
    {
      "affs": [
        2
      ],
      "name": "Giordano Scappucci",
      "orcid": "0000-0003-2512-0079"
    },
    {
      "affs": [
        3
      ],
      "name": "Łukasz Cywiński",
      "orcid": "0000-0002-0162-7943"
    },
    {
      "affs": [
        0
      ],
      "name": "Hendrik Bluhm",
      "orcid": "0000-0002-5224-7254"
    },
    {
      "affs": [
        4
      ],
      "name": "Lars R. Schreiber",
      "orcid": "0000-0003-0904-9612"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/9h30cfnvt8k68.bib",
  "cited_by": 5,
  "doi": "10.1038/s41467-026-74382-5",
  "fulltext_url": null,
  "id": "9h30cfnvt8k68",
  "issns": [
    "2041-1723"
  ],
  "landing_url": "https://doi.org/10.1038/s41467-026-74382-5",
  "language": "en",
  "licence": "CC-BY",
  "licence_label": "CC BY",
  "licence_source": "journal",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "3107|Quantum and electron transport phenomena"
    ]
  ],
  "openalex": "W4414969820",
  "pdf_url": "https://www.nature.com/articles/s41467-026-74382-5.pdf",
  "pmcid": "PMC13282485",
  "pmid": "42321194",
  "published": "2026-06-19",
  "publisher": "Nature Portfolio",
  "ris": "https://research.draconitic.com/paper/9h30cfnvt8k68.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T13:26:43Z",
      "native_id": "W4414969820",
      "source": "openalex",
      "url": "https://doi.org/10.1038/s41467-026-74382-5"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "openalex:3107|Quantum and electron transport phenomena",
      "subfield": "amo"
    }
  ],
  "title": "Impact of the local valley splitting on the coherence of conveyor-belt spin shuttling in 28Si/SiGe",
  "title_text": "Impact of the local valley splitting on the coherence of conveyor-belt spin shuttling in 28Si/SiGe",
  "type": "peer-reviewed",
  "updated_at": "2026-11-03T13:20:27Z",
  "url": "https://research.draconitic.com/paper/9h30cfnvt8k68",
  "venue": "Nature Communications",
  "versions": []
}