{
  "annotation_id": "a2375e6e-bfe4-49f3-bf2d-e72a45b41875",
  "date_created": "2026-03-02T18:02:41.658000Z",
  "date_modified": "2026-03-02T18:02:41.658000Z",
  "file_hash": "eb965e1b058741603e0a0967e7303185daf3d53e5dcb148071d6ef4f7d746067",
  "private": false,
  "record": {
    "abstract": "Unstable systems such as media with inverted atomic population have been\nshown to allow the propagation of analytic wavepackets with group velocity\nfaster than that of light, without violating causality. We illuminate the\nimportant role played by unstable modes in this propagation, and show that the\nquantum fluctuations of these modes, and their unitary time evolution, impose\nsevere restrictions on the observation of superluminal phenomena.",
    "arxiv_id": "quant-ph/9804018",
    "authors": [
      "Yakir Aharonov",
      "Benni Reznik",
      "Ady Stern"
    ],
    "categories": [
      "quant-ph",
      "cond-mat",
      "gr-qc",
      "hep-th"
    ],
    "doi": "10.1103/PhysRevLett.81.2190",
    "journal_ref": "Phys.Rev.Lett. 81 (1998) 2190-2193",
    "title": "Quantum limitations on superluminal propagation",
    "url": "https://arxiv.org/abs/quant-ph/9804018"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "1663a5ee-4475-4394-bfd0-06f875e32a0e",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}