{
  "annotation_id": "3ce6e007-473e-4f21-9845-a325723f07e8",
  "date_created": "2026-03-02T18:02:07.054000Z",
  "date_modified": "2026-03-02T18:02:07.054000Z",
  "file_hash": "bb55a44b6e2c028b068f835f5ef4901ab18930e65deceb8893f02d3612f176f3",
  "private": false,
  "record": {
    "abstract": "We construct entanglement witnesses using fundamental quantum operators of\nspin models which contain two-particle interactions and posses a certain\nsymmetry. By choosing the Hamiltonian as such an operator, our method can be\nused for detecting entanglement by energy measurement. We apply this method to\nthe cubic Heisenberg lattice model in a magnetic field, the XY model and other\nfamiliar spin systems. Our method is used to obtain a temperature bound for\nseparable states for systems in thermal equilibrium. We also study the\nBose-Hubbard model and relate its energy minimum for separable states to the\nminimum obtained from the Gutzwiller ansatz.",
    "arxiv_id": "quant-ph/0406061",
    "authors": [
      "Geza Toth"
    ],
    "categories": [
      "quant-ph",
      "cond-mat.stat-mech"
    ],
    "doi": "10.1103/PhysRevA.71.010301",
    "journal_ref": "Physical Review A 71, 010301(R) (2005)",
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "title": "Entanglement Witnesses in Spin Models",
    "url": "https://arxiv.org/abs/quant-ph/0406061"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "7fedf89b-08e1-47bd-ac5d-e910bcb857ef",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}