{
  "annotation_id": "3d752c08-a980-4975-9016-81a7635cebc8",
  "date_created": "2026-03-02T18:02:19.685000Z",
  "date_modified": "2026-03-02T18:02:19.685000Z",
  "file_hash": "65f72ddd4bcf0d5a2a4b169f37e8cdd7b8deeb0752098f010a4ce08f2d2798b5",
  "private": false,
  "record": {
    "abstract": "We consider entanglement detection for quantum key distribution systems that\nuse two signal states and continuous variable measurements. This problem can be\nformulated as a separability problem in a qubit-mode system. To verify\nentanglement, we introduce an object that combines the covariance matrix of the\nmode with the density matrix of the qubit. We derive necessary separability\ncriteria for this scenario. These criteria can be readily evaluated using\nsemidefinite programming and we apply them to the specific quantum key\ndistribution protocol.",
    "arxiv_id": "quant-ph/0510022",
    "authors": [
      "Johannes Rigas",
      "Otfried G\u00fchne",
      "Norbert L\u00fctkenhaus"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.73.012341",
    "journal_ref": "Phys. Rev. A 73, 012341 (2006)",
    "title": "Entanglement verification for quantum key distribution systems with an   underlying bipartite qubit-mode structure",
    "url": "https://arxiv.org/abs/quant-ph/0510022"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "312bd774-e927-46ab-8a75-08d9d0b9f36d",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}