{
  "annotation_id": "f2fb5609-18d2-4d7c-92ad-11e79f92bd7b",
  "date_created": "2026-03-02T18:02:03.482000Z",
  "date_modified": "2026-03-02T18:02:03.482000Z",
  "file_hash": "186defb70ae9636a44a84e361271eb65202298eb6db591a1db4028fdafd2c65d",
  "private": false,
  "record": {
    "abstract": "We study the entanglement of a two-qubit one dimensional XYZ Heisenberg chain\nin thermal equilibrium at temperature T. We obtain an analytical expression for\nthe entanglement of formation for this system in terms of the parameters of the\nHamiltonian and T. We show that depending on the relation among the coupling\nconstants it is possible to increase the amount of entanglement of the system\nincreasing its anisotropy. We also show numerically that for all sets of the\ncoupling constants entanglement is a monotonically decreasing function of the\ntemperature T, proving that we must have at least an external magnetic field in\nthe z-direction to obtain a behavior where entanglement increases with T.",
    "arxiv_id": "quant-ph/0311185",
    "authors": [
      "G. Rigolin"
    ],
    "categories": [
      "quant-ph"
    ],
    "journal_ref": "Int. J. Quant. Inf. 2, 393 (2004)",
    "title": "Thermal entanglement in the two-qubit Heisenberg XYZ model",
    "url": "https://arxiv.org/abs/quant-ph/0311185"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "e8008469-2ee1-4e26-90d3-744ed4f2b2d8",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}