{
  "annotation_id": "b4bb02c0-2c43-42d3-a684-3c1f85717936",
  "date_created": "2026-03-02T18:01:59.975000Z",
  "date_modified": "2026-03-02T18:01:59.975000Z",
  "file_hash": "6dc2dcde616c67c914783c516170944e935ae8c60c5bd39b3e9818df642fdc6d",
  "private": false,
  "record": {
    "abstract": "We have presented a theoretical extended version of dense coding protocol\nusing entangled position state of two particles shared between two parties. A\nrepresentation of Bell states and the required unitary operators are shown\nutilizing symmetric normalized Hadamard matrices. In addition, some explicit\nand conceivable forms for the unitary operators are presented by using some\nintroduced basic operators. It is shown that, the proposed version is\nlogarithmically efficient than some other multi-qubit dense coding protocols.",
    "arxiv_id": "quant-ph/0305118",
    "authors": [
      "O. Akhavan",
      "A. T. Rezakhani",
      "M. Golshani"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1016/S0375-9601(03)00770-9",
    "journal_ref": "Phys. Lett. A 313, 261 (2003)",
    "title": "Quantum dense coding by spatial state entanglement",
    "url": "https://arxiv.org/abs/quant-ph/0305118"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "b89abe8c-cbd7-4a28-9197-a5785b67d83f",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}