{
  "annotation_id": "3412445b-1fa4-4280-870a-390d8e246498",
  "date_created": "2026-03-02T18:01:52.616000Z",
  "date_modified": "2026-03-02T18:01:52.616000Z",
  "file_hash": "89eac4d3d5de4bca70a6eb1233580d7cdea2cfaff0f48218bba93c279d59ab23",
  "private": false,
  "record": {
    "abstract": "We present an experimental realization of a two-photon conditional-phase\nswitch, related to the ``$c$-$\\phi $\u0027\u0027 gate of quantum computation. This gate\nrelies on quantum interference between photon pairs, generating entanglement\nbetween two optical modes through the process of spontaneous parametric\ndown-conversion (SPDC). The interference effect serves to enhance the effective\nnonlinearity by many orders of magnitude, so it is significant at the quantum\n(single-photon) level. By adjusting the relative optical phase between the\nclassical pump for SPDC and the pair of input modes, one can impress a large\nphase shift on one beam which depends on the presence or absence of a single\nphoton in a control mode.",
    "arxiv_id": "quant-ph/0205109",
    "authors": [
      "K. J. Resch",
      "J. S. Lundeen",
      "A. M. Steinberg"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevLett.89.037904",
    "journal_ref": "Physical Review Letters 89, 037904 (2002)",
    "title": "A conditional-phase switch at the single-photon level",
    "url": "https://arxiv.org/abs/quant-ph/0205109"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "eb701d8e-170e-444b-90d0-253dc51d668a",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}