{
  "annotation_id": "3b32cf24-7fab-4257-aaa0-e9fe382c03ff",
  "date_created": "2026-03-02T18:01:45.522000Z",
  "date_modified": "2026-03-02T18:01:45.522000Z",
  "file_hash": "d0d6300c82b51152c2824e5115874eef80e7bc7dfb64c297f46096f1ee863ff6",
  "private": false,
  "record": {
    "abstract": "The physically allowed quantum evolutions on a single qubit can be described\nin terms of their geometry. From a simple parameterisation of unital\nsingle-qubit channels, the canonical form of all such channels can be given.\nThe related geometry can be used to understand how to approximate positive maps\nby completely-positive maps, such as in the case of optimal eavesdropping\nstrategies. These quantum channels can be generated by the appropriate network\nor through dynamical means. The Str{\\o}mer-Woronowisc result can also be\nunderstood in terms of this geometry.",
    "arxiv_id": "quant-ph/0106035",
    "authors": [
      "D. K. L. Oi"
    ],
    "categories": [
      "quant-ph"
    ],
    "title": "The Geometry of Single-Qubit Maps",
    "url": "https://arxiv.org/abs/quant-ph/0106035"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "5834c30b-5b43-43a1-8a7d-1b01e52ba97e",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}