{
  "annotation_id": "8877bc1e-abda-4e81-baff-6a8332cd01b5",
  "date_created": "2026-03-02T18:01:52.682000Z",
  "date_modified": "2026-03-02T18:01:52.682000Z",
  "file_hash": "458857a00e6b05263fa47d25f24e18db0e888cb9f8b2ec896ed8b8a70c6468c3",
  "private": false,
  "record": {
    "abstract": "An extension of the notion of concurrence introduced by Wooters is used to\nquantify the entanglement of certain multipartite pure states, namely, the BCS\nstate of superconducting compounds. This leads to a definition of the\nmacrocanonical entanglement of pairing (MEP) for which we compute an analytical\nformula in terms of two adimensional numbers, the cut-off and gap numbers,\nwhich depend on measurable physical quantities. We find that strongly coupled\nBCS elements like Pb and Nb have much larger MEP values than more conventional\nBCS transition metal superconductors.",
    "arxiv_id": "quant-ph/0207026",
    "authors": [
      "M. A. Martin-Delgado"
    ],
    "categories": [
      "quant-ph",
      "cond-mat",
      "hep-th"
    ],
    "title": "Entanglement and Concurrence in the BCS State",
    "url": "https://arxiv.org/abs/quant-ph/0207026"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "a6d6607c-0101-4668-b355-6d29aa948d01",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}