{
  "annotation_id": "8081d2ac-3a56-4a3b-8945-917c67eac33e",
  "date_created": "2026-03-02T18:01:56.670000Z",
  "date_modified": "2026-03-02T18:01:56.670000Z",
  "file_hash": "c1c778dd70f1fdc63957c5f3e5557c497853d3b46068e54cf345d6b7ce14a2f3",
  "private": false,
  "record": {
    "abstract": "We analyze the relation between the entanglement and spin-squeezing parameter\nin the two-atom Dicke model and identify the source of the discrepancy recently\nreported by Banerjee and Zhou et al that one can observe entanglement without\nspin squeezing. Our calculations demonstrate that there are two criteria for\nentanglement, one associated with the two-photon coherences that create\ntwo-photon entangled states, and the other associated with populations of the\ncollective states. We find that the spin-squeezing parameter correctly predicts\nentanglement in the two-atom Dicke system only if it is associated with\ntwo-photon entangled states, but fails to predict entanglement when it is\nassociated with the entangled symmetric state. This explicitly identifies the\nsource of the discrepancy and explains why the system can be entangled without\nspin-squeezing. We illustrate these findings in three examples of the\ninteraction of the system with thermal, classical squeezed vacuum and quantum\nsqueezed vacuum fields.",
    "arxiv_id": "quant-ph/0303100",
    "authors": [
      "A. Messikh",
      "Z. Ficek",
      "M. R. B. Wahiddin"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1088/1464-4266/5/2/101",
    "title": "Entanglement and spin squeezing in the two-atom Dicke model",
    "url": "https://arxiv.org/abs/quant-ph/0303100"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "d3108702-4f0d-4955-8bf4-94d0c466c939",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}