{
  "annotation_id": "53d68d5f-527b-45ad-a278-8284528c5fa3",
  "date_created": "2026-03-02T18:02:06.880000Z",
  "date_modified": "2026-03-02T18:02:06.880000Z",
  "file_hash": "28a3e618a2c3f4507f1d6540d904ae643bc9a09e403c0e72afc094cf692d8190",
  "private": false,
  "record": {
    "abstract": "We show that it is possible to transfer two-bit information via encoding a\nsingle qubit in a conventional nuclear magnetic resonance (NMR) experiment with\ntwo very weakly polarized nuclear spins. Nevertheless, the experiment can not\nbe regarded as a demonstration of superdense coding by means of NMR because it\nis based on the large number of molecules being involved in the ensemble state\nrather than the entanglement of the NMR states. Following the discussions, an\nentanglement witness, particularly applicable for NMR, is introduced based on\nseparate and simultaneous measurement of the individual nuclear spin\nmagnetizations.",
    "arxiv_id": "quant-ph/0405175",
    "authors": [
      "Robabeh Rahimi",
      "Kazuyuki Takeda",
      "Masanao Ozawa",
      "Masahiro Kitagawa"
    ],
    "categories": [
      "quant-ph"
    ],
    "title": "Entanglement Witness Derived from NMR Superdense Coding",
    "url": "https://arxiv.org/abs/quant-ph/0405175"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "3600bdda-746d-43b6-b1cd-400f911850e3",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}