{
  "annotation_id": "fea72252-213c-402c-81b3-53ce867f6c67",
  "date_created": "2026-03-02T18:02:27.110000Z",
  "date_modified": "2026-03-02T18:02:27.110000Z",
  "file_hash": "1a8346390e5ace96c1cfb443446a6e6785c623120fd56e8ba8edab5ca655ee91",
  "private": false,
  "record": {
    "abstract": "We provide a complete analysis of mixed three-qubit states composed of a GHZ\nstate and a W state orthogonal to the former. We present optimal decompositions\nand convex roofs for the three-tangle. Further, we provide an analytical method\nto decide whether or not an arbitrary rank-2 state of three qubits has\nvanishing three-tangle. These results highlight intriguing differences compared\nto the properties of two-qubit mixed states, and may serve as a quantitative\nreference for future studies of entanglement in multipartite mixed states. By\nstudying the Coffman-Kundu-Wootters inequality we find that, while the amounts\nof inequivalent entanglement types strictly add up for pure states, this\n``monogamy\u0027\u0027 can be lifted for mixed states by virtue of vanishing tangle\nmeasures.",
    "arxiv_id": "quant-ph/0606071",
    "authors": [
      "Robert Lohmayer",
      "Andreas Osterloh",
      "Jens Siewert",
      "Armin Uhlmann"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevLett.97.260502",
    "journal_ref": "Phys. Rev. Lett. 97, 260502 (2006)",
    "title": "Entangled three-qubit states without concurrence and three-tangle",
    "url": "https://arxiv.org/abs/quant-ph/0606071"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "adb3a272-b398-4933-84ce-b26212bfb406",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}