{
  "annotation_id": "f0319967-71fa-4787-b17c-91466669d4b6",
  "date_created": "2026-03-02T18:02:10.343000Z",
  "date_modified": "2026-03-02T18:02:10.343000Z",
  "file_hash": "70fac1c6a4600e6e13c17eb9736b6ca166c125ab550eebe8d0d02b4942229cfb",
  "private": false,
  "record": {
    "abstract": "We demonstrate that the magnetic susceptibility of strongly alternating\nantiferromagnetic spin-1/2 chains is an entanglement witness. Specifically,\nmagnetic susceptibility of copper nitrate (CN) measured in 1963 (Berger et al.,\nPhys. Rev. 132, 1057 (1963)) cannot be described without presence of\nentanglement. A detailed analysis of the spin correlations in CN as obtained\nfrom neutron scattering experiments (Xu et al., Phys. Rev. Lett. 84, 4465\n(2000)) provides microscopic support for this interpretation. We present a\nquantitative analysis resulting in the critical temperature of 5K in both,\ncompletely independent, experiments below which entanglement exists.",
    "arxiv_id": "quant-ph/0410138",
    "authors": [
      "Caslav Brukner",
      "Vlatko Vedral",
      "Anton Zeilinger"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.73.012110",
    "journal_ref": "Phys. Rev. A 73, 012110 (2006)",
    "title": "Crucial Role of Quantum Entanglement in Bulk Properties of Solids",
    "url": "https://arxiv.org/abs/quant-ph/0410138"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "c7752fb5-a15c-453f-87ca-8759333aaf23",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}