{
  "annotation_id": "1f25403f-c5c3-4ce6-8f05-574a5f9463b3",
  "date_created": "2026-03-02T18:01:49.153000Z",
  "date_modified": "2026-03-02T18:01:49.153000Z",
  "file_hash": "056e006721587bbcbeb92d4c4f02513a29b8c02cd42874e6c0af72e85f8dd9b4",
  "private": false,
  "record": {
    "abstract": "In a recent paper, Rungta et. al. [Phys. Rev. A, 64, 042315, 2001] introduced\na measure of mixed-state entanglement called the I-concurrence for arbitrary\npairs of qudits. We find an exact formula for an entanglement measure closely\nrelated to the I-concurrence, the I-tangle, for all mixed states of two qudits\nhaving no more than two nonzero eigenvalues. We use this formula to provide a\ntight upper bound for the entanglement of formation for rank-2 mixed states of\na qubit and a qudit.",
    "arxiv_id": "quant-ph/0203087",
    "authors": [
      "Tobias J. Osborne"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.72.022309",
    "journal_ref": "Phys. Rev. A 72, 022309 (2005)",
    "title": "Entanglement for rank-2 mixed states",
    "url": "https://arxiv.org/abs/quant-ph/0203087"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "b7dc6645-1ad7-4e54-bcec-16e822dc44c8",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}