{
  "annotation_id": "a9c5ee2d-ba7b-4cce-93bb-4195ded063de",
  "date_created": "2026-03-02T18:01:38.572000Z",
  "date_modified": "2026-03-02T18:01:38.572000Z",
  "file_hash": "375ef1847a53ae21ebd508fce044ad4e7cf08629008022420cec1679aa686717",
  "private": false,
  "record": {
    "abstract": "The U(1,1) and U(2) transformations realized by three-mode interaction in the\nrespective parametric approximations are studied in conditional measurement,\nand the corresponding non-unitary transformation operators are derived. As an\napplication, the preparation of single-mode quantum states using an optical\nfeedback loop is discussed, with special emphasis of Fock state preparation.\nFor that example, the influence of non-perfect detection and feedback is also\nconsidered.",
    "arxiv_id": "quant-ph/0007050",
    "authors": [
      "J. Clausen",
      "H. Hansen",
      "L. Knoll",
      "J. Mlynek",
      "D. -G. Welsch"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1007/s003400000480",
    "journal_ref": "Appl. Phys. B 72, 43 (2001)",
    "title": "Conditional quantum state engineering in repeated 2-photon down   conversion",
    "url": "https://arxiv.org/abs/quant-ph/0007050"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "50810c60-973d-413a-99a2-23a81d431a5e",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}