{
  "annotation_id": "8b2f3991-518a-4460-bb99-e61c478e688b",
  "date_created": "2026-03-02T18:02:30.343000Z",
  "date_modified": "2026-03-02T18:02:30.343000Z",
  "file_hash": "681baeaea39993206ad4d02c5941c1fab16c9a3d8ada2898b32130390ddc1166",
  "private": false,
  "record": {
    "abstract": "We present two linear optical schemes using nonideal photodetectors to\ndemonstrate inseparability of W-type N-partite entangled states containing only\na single photon. First, we show that the pairwise entanglement of arbitrary two\nmodes chosen from N optical modes can be detected using the method proposed by\nNha and Kim [Phys. Rev. A 74, 012317 (2006)], thereby suggesting the full\ninseparability among N parties. In particular, this scheme is found to succeed\nfor any nonzero quantum efficiency of photodetectors. Second, we consider a\nquantum teleportation network using linear optics without auxiliary modes. The\nconditional teleportation can be optimized by a suitable choice of the\ntransmittance of the beam splitter in the Bell measurement. Specifically, we\nidentify the conditions under which maximum fidelity larger than classical\nbound 2/3 is achieved only in cooperation with other parties. We also\ninvestigate the case of on-off photodetectors that cannot discriminate the\nnumber of detected photons.",
    "arxiv_id": "quant-ph/0608055",
    "authors": [
      "Hyunchul Nha",
      "Jaewan Kim"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.75.012326",
    "journal_ref": "Phys. Rev. A 75, 012326 (2007)",
    "title": "Demonstrating multipartite entanglement of single-particle W states:   linear optical schemes",
    "url": "https://arxiv.org/abs/quant-ph/0608055"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "e11e1d5f-3462-4c40-9e90-825ee176fafe",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}