{
  "annotation_id": "ec4e4067-86f8-4819-925e-79d8cb4abaed",
  "date_created": "2026-03-02T18:02:20.015000Z",
  "date_modified": "2026-03-02T18:02:20.015000Z",
  "file_hash": "05eb32fef69f65208476679a1b36c52b115b0ba40ef569994dbe0272fbcff4a9",
  "private": false,
  "record": {
    "abstract": "Although it has been known for some time that quantum mechanics can be\nformulated in a way that treats prediction and retrodiction on an equal\nfooting, most attention in engineering quantum states has been devoted to\npredictive states, that is, states associated with the a preparation event.\nRetrodictive states, which are associated with a measurement event and\npropagate backwards in time, are also useful, however. In this paper we show\nhow any retrodictive state of light that can be written to a good approximation\nas a finite superposition of photon number states can be generated by an\noptical multiport device. The composition of the state is adjusted by\ncontrolling predictive coherent input states. We show how the probability of\nsuccessful state generation can be optimised by adjusting the multiport device\nand also examine a versatile configuration that is useful for generating a\nrange of states.",
    "arxiv_id": "quant-ph/0510217",
    "authors": [
      "K. L. Pregnell",
      "D. T. Pegg"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1080/09500340408232476",
    "journal_ref": "J. Mod. Opt., 51, 1613 (2004)",
    "title": "Retrodictive quantum optical state engineering",
    "url": "https://arxiv.org/abs/quant-ph/0510217"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "9e20b51b-30c7-4dc7-b954-f10ed547bd0e",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}