{
  "abstract": "The independent and identically distributed (iid) paradigm for asymptotic communication through quantum channels describes $n$ uses of a channel $Φ$ by $Φ^{\\otimes n}$. Since exact tensor-power behaviour is an idealization, we ask whether the asymptotic capacities of $Φ$ remain achievable for channel sequences that are almost-iid along $Φ$. We consider sequences of Choi-almost-iid channels whose normalized Choi states are Mazzola-Sutter-Renner (MSR) almost-iid along the normalized Choi state of $Φ$, with defect parameters $r_n=o(n)$. In Renner's exponential de Finetti theorem for quantum states, almost-iid states appear in the approximating mixture and motivate the MSR almost-iid class. Choi-almost-iid channels play the corresponding role in an exponential de Finetti theorem for quantum channels established in a companion paper. In this paper, we prove that the universal unassisted classical and quantum capacities of the class of Choi-almost-iid channels along $Φ$ equal those of the channel $Φ$. Here universality is within this class: for each rate below the relevant capacity, a code sequence depending on $Φ$ and the rate, but not on the particular channel sequence, achieves vanishing error for every sequence in the class.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.00442",
  "author_total": 3,
  "authors": [
    {
      "name": "Liuhang Ye"
    },
    {
      "name": "Bjarne Bergh"
    },
    {
      "name": "Nilanjana Datta"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/5j6dw503wtqs8.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.00442",
  "fulltext_url": null,
  "id": "5j6dw503wtqs8",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.00442",
  "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": "W7216091326",
  "pdf_url": "https://arxiv.org/pdf/2610.00442",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-01",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/5j6dw503wtqs8.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:26:03Z",
      "native_id": "2610.00442",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.00442"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "Robust classical and quantum communication over almost-iid channels",
  "title_text": "Robust classical and quantum communication over almost-iid channels",
  "type": "preprint",
  "updated_at": "2026-10-30T12:26:03Z",
  "url": "https://research.draconitic.com/paper/5j6dw503wtqs8",
  "venue": "arXiv",
  "versions": []
}