{
  "annotation_id": "10b932a4-f6f6-4622-858d-17033bd56c30",
  "date_created": "2026-03-02T18:02:48.232000Z",
  "date_modified": "2026-03-02T18:02:48.232000Z",
  "file_hash": "9c55e54cdc159936a883b9e23ebab7b5b47db9d7f1a9928e7ea71666ad280e96",
  "private": false,
  "record": {
    "abstract": "The generation of arbitrary single-mode quantum states from the vacuum by\nalternate coherent displacement and photon adding as well as the measurement of\nthe overlap of a signal with an arbitrarily chosen quantum state are studied.\nWith regard to implementations, the transformation of the quantum state of a\ntraveling optical field at an array of beam splitters is considered, using\nconditional measurement. Allowing for arbitrary quantum states of both the\ninput reference modes and the output reference modes on which the measurements\nare performed, the setup is described within the concept of two-port\nnon-unitary transformation, and the overall non-unitary transformation operator\nis derived. It is shown to be a product of operators, where each operator is\nassigned to one of the beam splitters and can be expressed in terms of an\ns-ordered operator product, with s being determined by the beam splitter\ntransmittance or reflectance. As an example we discuss the generation of and\noverlap measurement with Schroedinger-cat-like states.",
    "arxiv_id": "quant-ph/9905085",
    "authors": [
      "J. Clausen",
      "M. Dakna",
      "L. Knoell",
      "D. -G. Welsch"
    ],
    "categories": [
      "quant-ph"
    ],
    "journal_ref": "Acta Phys. Slov. 49, 653 (1999)",
    "title": "Conditional quantum state engineering at beam splitter arrays",
    "url": "https://arxiv.org/abs/quant-ph/9905085"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "eff70d33-b862-4f02-a127-8842fd93f839",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}