{
  "annotation_id": "c293b0d3-1ad1-488e-8402-ed9fc4070a9b",
  "date_created": "2026-03-02T18:02:24.140000Z",
  "date_modified": "2026-03-02T18:02:24.140000Z",
  "file_hash": "0d6146672b47c3eb3e8aba9c63444df3267c24ad5de1e4e5d92c8eadc9b5b041",
  "private": false,
  "record": {
    "abstract": "We present a theory for the quantum state of photon pairs generated from\nspontaneous parametric down conversion nonlinear process in which the influence\nof the final sizes of nonlinear optical crystals on eigen optical modes is\nexplicitly taken into consideration. We find that these photon pairs are not in\nentangled quantum states. Polarization correlations between the signal beam and\nthe idler beam are explained. We also show that the two photons generated from\nSPDC are not spatially separated, therefore the polarization correlation\nbetween the signal and idler beams is not an evidence for quantum non-locality.",
    "arxiv_id": "quant-ph/0602121",
    "authors": [
      "Ruo Peng Wang",
      "Hui Rong Zhang"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1134/S0030400X07070235",
    "title": "Theory for quantum state of photon pairs generated from spontaneous   parametric down conversion nonlinear process",
    "url": "https://arxiv.org/abs/quant-ph/0602121"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "da7f69b6-2716-461a-9ea1-4ba1d32bb547",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}