{
  "annotation_id": "b4a2fbc7-4a12-4a08-ba8e-8ffcfc0e555b",
  "date_created": "2026-03-02T18:01:42.417000Z",
  "date_modified": "2026-03-02T18:01:42.417000Z",
  "file_hash": "6adceaa982b0ba122e8acdc2a685371a47e72f02a6727eb3cb8688b786556cd2",
  "private": false,
  "record": {
    "abstract": "The phase conjugation of an unknown Gaussian state cannot be realized\nperfectly by any physical process. A semi-classical argument is used to derive\na tight lower bound on the noise that must be introduced by an approximate\nphase conjugation operation. A universal transformation achieving the optimal\nimperfect phase conjugation is then presented, which is the continuous\ncounterpart of the universal-NOT transformation for quantum bits. As a\nconsequence, it is also shown that more information can be encoded into a pair\nof conjugate Gaussian states than using twice the same state.",
    "arxiv_id": "quant-ph/0012020",
    "authors": [
      "N. J. Cerf",
      "S. Iblisdir"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.64.032307",
    "journal_ref": "Phys. Rev. A 64, 032307 (2001)",
    "title": "Phase Conjugation of Continuous Quantum Variables",
    "url": "https://arxiv.org/abs/quant-ph/0012020"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "25341f8e-1250-448b-ba98-cf4a1c336696",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}