{
  "annotation_id": "0b326720-37a9-4216-8765-4e265d47463a",
  "date_created": "2026-03-02T18:01:49.257000Z",
  "date_modified": "2026-03-02T18:01:49.257000Z",
  "file_hash": "75bc30f18352efb2efe6cc7a5332b03dfc100aa4b7569236a71b8955e60d70c1",
  "private": false,
  "record": {
    "abstract": "Transmission of classical information using quantum objects such as polarized\nphotons is studied. The classical (Shannon) channel capacity and its relation\nto quantum (von Neumann) channel capacity is investigated for various receiver\narrangements.\n  A quantum channel with transmission impairment caused by attenuation and\nrandom polarization noise is considered. It is shown that the maximal (von\nNeumann) capacity of such a channel can be realized by a simple symbol by\nsymbol detector followed by a classical error correcting decoder.\n  For an intensity limited optical channel capacity is achieved by on-off\nkeying (OOK). The capacity per unit cost is shown to be 1 nat/photon = 1.44\nbit/photon, slightly larger than the 1 bit/photon obtained by orthogonal\nquantum signals.",
    "arxiv_id": "quant-ph/0202119",
    "authors": [
      "G\u00f6ran Einarsson"
    ],
    "categories": [
      "quant-ph"
    ],
    "title": "Quantum Theory and Classical Information",
    "url": "https://arxiv.org/abs/quant-ph/0202119"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "50db2c16-a62a-4df3-8129-8e9c8965ae16",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}