{
  "annotation_id": "10e4d5c1-8501-4a2d-b0ad-106376cae6a6",
  "date_created": "2026-03-02T18:01:56.122000Z",
  "date_modified": "2026-03-02T18:01:56.122000Z",
  "file_hash": "b60a4f9c23942ca50fc6884db35d5955124eca9418863b23feff7905055960e0",
  "private": false,
  "record": {
    "abstract": "We study the evolution of twin-beam propagating inside active media that may\nbe used to establish a continuous variable entangled channel between two\ndistant users. In particular, we analyze how entanglement is degraded during\npropagation, and determine a threshold value for the interaction time, above\nwhich the state become separable, and thus useless for entanglement based\nmanipulations. We explicitly calculate the fidelity for coherent state\nteleportation and show that it is larger than one half for the whole range of\nparameters preserving entanglemenent.",
    "arxiv_id": "quant-ph/0211126",
    "authors": [
      "Matteo G. A. Paris"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1088/1464-4266/4/6/313",
    "journal_ref": "Journal of Optics B Vol 4 Num 6 Pag 442 (Dec 2002)",
    "title": "Evolution of twin-beam in active optical media",
    "url": "https://arxiv.org/abs/quant-ph/0211126"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "319fb9d8-9a60-4bdb-9700-0b0b0c2745b5",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}