{
  "abstract": "Superconducting microwave links have enabled deterministic state transfer and remote entanglement between qubits, but deterministic links have so far operated with an effectively two-dimensional transmitted Hilbert space. Here we demonstrate a superconducting qutrit link between two independently packaged nodes connected by a microwave channel. Each node combines a transmon qutrit, a transmission resonator, and a tunable Purcell-filter interface, allowing the two remote microwave-photon interfaces to be matched in both frequency and bandwidth. We implement two transition-selective photon-mediated operations that transfer the $|e\\rangle$ and $|f\\rangle$ qutrit components in distinct temporal modes of the same channel. We tomographically characterize arbitrary qutrit-state transfer, obtaining a mean transferred-state fidelity of 83.68% and a qutrit process fidelity of 77.12%, exceeding both the classical qutrit-transfer benchmark and the best possible average fidelity of an effective qubit channel used to transmit an arbitrary qutrit. Using partial-transfer operations, we reconstruct a remote two-qutrit state with negativity 0.730, a tomography-inferred dense-coding capacity of 2.273 bits, and a tomography-inferred Collins-Gisin-Linden-Massar-Popescu (CGLMP) parameter $I_3=2.332$, all beyond the corresponding qubit or local bounds. These results demonstrate a superconducting microwave link that uses the native three-level structure of transmons as a genuine high-dimensional communication resource.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2606.29475",
  "author_total": 10,
  "authors": [
    {
      "name": "Xiang Li"
    },
    {
      "name": "Zheng-Yang Mei"
    },
    {
      "name": "Yang He"
    },
    {
      "name": "Si-Lu Zhao"
    },
    {
      "name": "Yan-Jun Liu"
    },
    {
      "name": "Xiao-Hui Song"
    },
    {
      "name": "Kai Xu"
    },
    {
      "name": "Zhong-Cheng Xiang"
    },
    {
      "name": "Dong-Ning Zheng"
    },
    {
      "name": "Heng Fan"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/9r92v2xh10fzd.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2606.29475",
  "fulltext_url": null,
  "id": "9r92v2xh10fzd",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2606.29475",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "quant-ph"
    ],
    [
      "openalex",
      "1702|Quantum Information and Cryptography"
    ]
  ],
  "openalex": "W7166698704",
  "pdf_url": "https://arxiv.org/pdf/2606.29475",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-04",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/9r92v2xh10fzd.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:27:01Z",
      "native_id": "2606.29475",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2606.29475"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "A superconducting qutrit link beyond the qubit limit",
  "title_text": "A superconducting qutrit link beyond the qubit limit",
  "type": "preprint",
  "updated_at": "2026-10-30T12:27:01Z",
  "url": "https://research.draconitic.com/paper/9r92v2xh10fzd",
  "venue": "arXiv",
  "versions": []
}