{
  "annotation_id": "78a67212-55c7-444f-9399-4afccf849885",
  "date_created": "2026-03-02T18:01:42.358000Z",
  "date_modified": "2026-03-02T18:01:42.358000Z",
  "file_hash": "84ac58b737819ea75e6bd9131b3b0fbbe90e5aad8227b74849f686fe1cf9b57c",
  "private": false,
  "record": {
    "abstract": "The influence of losses in the interferometric generation and the\ntransmission of continuous-variable entangled light is studied, with special\nemphasis on Gaussian states. Based on the theory of quantum-state\ntransformation at absorbing dielectric devices, the amount of entanglement is\nquantified by means of the relative-entropy measure. Upper bounds of\nentanglement and the distance to the set of separable Gaussian states are\ncalculated. Compared with the distance measure, the bounds can substantially\noverestimate the entanglement. In particular, they do not show the drastic\ndecrease of entanglement with increasing mean photon number, as does the\ndistance measure.",
    "arxiv_id": "quant-ph/0103167",
    "authors": [
      "Stefan Scheel",
      "Dirk-Gunnar Welsch"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.64.063811",
    "title": "Entanglement generation and degradation by passive optical devices",
    "url": "https://arxiv.org/abs/quant-ph/0103167"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "e2efcc11-91f8-41c0-9423-0183b3c2e9c2",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}