{
  "annotation_id": "7eb16317-ce35-487a-8e26-b7d8f8073511",
  "date_created": "2026-03-02T18:02:20.739000Z",
  "date_modified": "2026-03-02T18:02:20.739000Z",
  "file_hash": "52d4850ade58142f7213127a3613d0e8e4c21c45af5c49e9aece76df7004eff3",
  "private": false,
  "record": {
    "abstract": "We investigate the effects of nonlinear couplings and external magnetic field\non the thermal entanglement in a two-spin-qutrit system by applying the concept\nof negativity. It is found that the nonlinear couplings favor the thermal\nentanglement creating. Only when the nonlinear couplings $|K|$ are larger than\na certain critical value does the entanglement exist. The dependence of the\nthermal entanglement in this system on the magnetic field and temperature is\nalso presented. The critical magnetic field increases with the increasing\nnonlinear couplings constant $|K|$. And for a fixed nonlinear couplings\nconstant, the critical temperature is independent of the magnetic field $B$.",
    "arxiv_id": "quant-ph/0510129",
    "authors": [
      "Guo-feng Zhang",
      "Shu-shen Li"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1016/j.optcom.2005.10.039",
    "journal_ref": "Optics Communications 260/347-350/2006",
    "title": "The effects of nonlinear couplings and external magnetic field on the   thermal entanglement in a two-spin-qutrit system",
    "url": "https://arxiv.org/abs/quant-ph/0510129"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "8772c7f4-331e-48a9-b9aa-a24fe766f4bf",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}