{
  "annotation_id": "437b6909-30d9-459f-8fa4-310fb9358f40",
  "date_created": "2026-03-02T18:02:02.660000Z",
  "date_modified": "2026-03-02T18:02:02.660000Z",
  "file_hash": "fa4c50a63ef4516a3c4cc78d87fa5eb5dff71224af53d032394bd7e21c670509",
  "private": false,
  "record": {
    "abstract": "A single photon, delocalized over two optical modes, is characterized by\nmeans of quantum homodyne tomography. The reconstructed four-dimensional\ndensity matrix extends over the entire Hilbert space and thus reveals, for the\nfirst time, complete information about the dual-rail optical quantum bit as a\nstate of the electromagnetic field. The experimental data violate the Bell\ninequality albeit with a loophole similar to the detection loophole in photon\ncounting experiments.",
    "arxiv_id": "quant-ph/0312135",
    "authors": [
      "S. A. Babichev",
      "J. Appel",
      "A. I. Lvovsky"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevLett.92.193601",
    "journal_ref": "Physical Review Letters 92, 193601 (2004)",
    "title": "Homodyne tomography characterization and nonlocality of a dual-mode   optical qubit",
    "url": "https://arxiv.org/abs/quant-ph/0312135"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "21c5ab60-cf55-4745-96f2-94f8a0bad8f8",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}