{
  "annotation_id": "00d43a3e-6814-44be-87ff-69f96ceb26c8",
  "date_created": "2026-03-02T18:02:00.293000Z",
  "date_modified": "2026-03-02T18:02:00.293000Z",
  "file_hash": "a95d7e5d32d1223d7df39cea600a0f110bb2c6b25e594b1808d3ea63be8a5df3",
  "private": false,
  "record": {
    "abstract": "The technique of quantum repeaters is a promising candidate for sending\nquantum states over long distances through a lossy channel. The usual\ndiscussions of this technique deals with only a finite dimensional Hilbert\nspace. However the qubits with which one implements this procedure will \"ride\"\non continuous degrees of freedom of the carrier particles. Here we analyze the\naction of quantum repeaters using a model based on pulsed parametric down\nconversion entanglement swapping. Our model contains some basic traits of a\nreal experiment. We show that the state created, after the use of any number of\nparametric down converters in a series of entanglement swappings, is always an\nentangled (actually distillable) state, although of a different form than the\none that is usually assumed. Furthermore, the output state always violates a\nBell inequality.",
    "arxiv_id": "quant-ph/0305044",
    "authors": [
      "Aditi Sen De",
      "Ujjwal Sen",
      "Marek Zukowski"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.68.062301",
    "journal_ref": "Phys. Rev. A 68, 062301 (2003)",
    "title": "Output state in multiple entanglement swapping",
    "url": "https://arxiv.org/abs/quant-ph/0305044"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "f785d51d-6bfe-4b3c-ae36-73245224d6fd",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}