{
  "annotation_id": "a34fa69e-6f0d-4614-bd69-29c3ba01a039",
  "date_created": "2026-03-02T18:02:41.425000Z",
  "date_modified": "2026-03-02T18:02:41.425000Z",
  "file_hash": "5c509db257e796a3fd908e62a659dec8751980442cac8b3818ea1ac82940bb4d",
  "private": false,
  "record": {
    "abstract": "We show that no source encoding is needed in the definition of the capacity\nof a quantum channel for carrying quantum information. This allows us to use\nthe coherent information maximized over all sources and and block sizes, but\nnot encodings, to bound the quantum capacity. We perform an explicit\ncalculation of this maximum coherent information for the quantum erasure\nchannel and apply the bound in order find the erasure channel\u0027s capacity\nwithout relying on an unproven assumption as in an earlier paper.",
    "arxiv_id": "quant-ph/9711032",
    "authors": [
      "H. Barnum",
      "J. A. Smolin",
      "B. M. Terhal"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.58.3496",
    "journal_ref": "Phys.Rev.A58:3496,1998",
    "title": "The quantum capacity is properly defined without encodings",
    "url": "https://arxiv.org/abs/quant-ph/9711032"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "3d0207dd-103f-4892-a93c-022d3a5eafe0",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}