{
  "annotation_id": "41870b34-ae2b-4719-ae4e-503a9f362a80",
  "date_created": "2026-03-02T18:02:48.243000Z",
  "date_modified": "2026-03-02T18:02:48.243000Z",
  "file_hash": "4920023bdd867a7f4173d225fe60fffcb8d57537a0bec1149f809ad8c7bb2360",
  "private": false,
  "record": {
    "abstract": "Classical messages can be sent via a noisy quantum channel in various ways,\ncorresponding to various choices of signal states of the channel. Previous work\nby Holevo and by Schumacher and Westmoreland relates the capacity of the\nchannel to the properties of the signal ensemble. Here we describe some\nproperties characterizing the ensemble that maximizes the capacity, using the\nrelative entropy \"distance\" between density operators to give the results a\ngeometric flavor.",
    "arxiv_id": "quant-ph/9912122",
    "authors": [
      "Benjamin Schumacher",
      "Michael D. Westmoreland"
    ],
    "categories": [
      "quant-ph"
    ],
    "title": "Optimal signal ensembles",
    "url": "https://arxiv.org/abs/quant-ph/9912122"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "fa7b0281-08fb-415e-971d-4ee352abf838",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}