{
  "annotation_id": "f27edf43-9bf5-4e63-805e-735f19901bb0",
  "date_created": "2026-03-02T18:02:45.083000Z",
  "date_modified": "2026-03-02T18:02:45.083000Z",
  "file_hash": "d81dca97e760d0f49a4f8f98e94edf01ca1865157334c65362510920b4217df7",
  "private": false,
  "record": {
    "abstract": "Using conditional measurement on a beam splitter, we study the transformation\nof the quantum state of the signal mode within the concept of two-port\nnon-unitary transformation. Allowing for arbitrary quantum states of both the\ninput reference mode and the output reference mode on which the measurement is\nperformed, we show that the non-unitary transformation operator can be given as\nan $s$-ordered operator product, where the value of $s$ is entirely determined\nby the absolute value of the beam splitter reflectance (or transmittance). The\nformalism generalizes previously obtained results that can be recovered by\nsimple specification of the non-unitary transformation operator. As an\napplication, we consider the generation of Schr\\\"odinger-cat-like states. An\nextension to mixed states and imperfect detection is outlined.",
    "arxiv_id": "quant-ph/9811063",
    "authors": [
      "J. Clausen",
      "M. Dakna",
      "L. Knoll",
      "D. -G. Welsch"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1088/1464-4266/1/3/306",
    "title": "Conditional quantum-state transformation at a beam splitter",
    "url": "https://arxiv.org/abs/quant-ph/9811063"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "ea62ce34-3fc8-4ba8-801a-88978393e557",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}