{
  "annotation_id": "c3a33c37-14c6-404f-a8c8-1e4b7154d77e",
  "date_created": "2026-03-02T18:02:40.450000Z",
  "date_modified": "2026-03-02T18:02:40.450000Z",
  "file_hash": "1e0c227054d14da7d4d283502236aeadf6edd4442f15708520c983538fd2a9e1",
  "private": false,
  "record": {
    "abstract": "The ``entanglement of formation\u0027\u0027 of a mixed state of a bipartite quantum\nsystem can be defined in terms of the number of pure singlets needed to create\nthe state with no further transfer of quantum information. We find an exact\nformula for the entanglement of formation for all mixed states of two qubits\nhaving no more than two non-zero eigenvalues, and we report evidence suggesting\nthat the formula is valid for all states of this system.",
    "arxiv_id": "quant-ph/9703041",
    "authors": [
      "Scott Hill",
      "William K. Wootters"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevLett.78.5022",
    "journal_ref": "Phys.Rev.Lett.78:5022-5025,1997",
    "title": "Entanglement of a Pair of Quantum Bits",
    "url": "https://arxiv.org/abs/quant-ph/9703041"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "bf99d085-e999-40d3-8743-764e29887169",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}