{
  "annotation_id": "903d4d1f-5375-4fe7-a39b-b3779cdbac20",
  "date_created": "2026-03-02T18:02:48.007000Z",
  "date_modified": "2026-03-02T18:02:48.007000Z",
  "file_hash": "695a4e298c8f30166cba122af03b20306f0243247dab6cfb1848e0ff5a312265",
  "private": false,
  "record": {
    "abstract": "The new process of quantum-injection into an optical parametric amplifier\noperating in entangled configuration is adopted to amplify into a large\ndimensionality spin 1/2 Hilbert space the quantum entanglement and\nsuperposition properties of the photon-couples generated by parametric\ndown-conversion. The structure of the Wigner function and of the field\u0027s\ncorrelation functions shows a decoherence-free, multiphoton Schroedinger-cat\nbehaviour of the emitted field which is largely detectable against the\nsqueezed-vacuum noise. Furthermore, owing to its entanglement character, the\nsystem is found to exhibit multi-particle quantum nonseparability and Bell-type\nnonlocality properties. These relevant quantum features are analyzed for\nseveral travelling-wave optical configurations implying different input\nquantum-injection schemes",
    "arxiv_id": "quant-ph/9905048",
    "authors": [
      "F. A. Bovino",
      "F. De Martini",
      "V. Mussi"
    ],
    "categories": [
      "quant-ph"
    ],
    "title": "Quantum Superposition of Parametrically Amplified Multiphoton Pure   States whitin a Decoherence-Free Schroedinger-Cat Structure",
    "url": "https://arxiv.org/abs/quant-ph/9905048"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "2e283109-33f3-4992-a633-e4be03f070a1",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}