{
  "annotation_id": "ffcc0d6c-13ca-416e-aa47-af5c887e85d1",
  "date_created": "2026-03-02T18:02:48.574000Z",
  "date_modified": "2026-03-02T18:02:48.574000Z",
  "file_hash": "2a462a60abc2a5b638b52e33745d5766e0403b1eeed745d48639b9cba34ee277",
  "private": false,
  "record": {
    "abstract": "Quantum mechanical complementarity ensures the security of the\nkey-distribution scheme reported by Brassard and Bennet in 1984 (BB84), but\ndoes not prohibit use of multi-photons as a signal carrier. We describe a novel\nBB84 scheme in which two nearly orthogonal coherent states carry the key, and\nthe superposition of these states (cat states) protects the communication\nchannel from eavesdropping. Information leakage to eavesdroppers can be\ndetermined from the visibility of the interferential fringes in the\ndistribution of the outcome when a certain quadrature component is measured\nthrough homodyne detection. The effect of channel loss and detector\ninefficiency is discussed.",
    "arxiv_id": "quant-ph/9911035",
    "authors": [
      "Y. Nambu",
      "A. Tomita",
      "Y. Chiba-Kohno",
      "K. Nakamura"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.62.012312",
    "journal_ref": "Phys. Rev. A62, 012312 (2000)",
    "title": "Quantum Key Distribution using Two Coherent States of Light and their   Superposition",
    "url": "https://arxiv.org/abs/quant-ph/9911035"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "252c4e67-fad3-4801-bd76-24673713007f",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}