{
  "annotation_id": "ded62068-eab9-461d-9258-a2aa2e8106d5",
  "date_created": "2026-03-02T18:02:06.397000Z",
  "date_modified": "2026-03-02T18:02:06.397000Z",
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  "record": {
    "abstract": "We propose a covariant protocol for transmitting reference frames encoded on\n$N$ spins, achieving sensitivity $N^{-2}$ without the need of a pre-established\nreference frame and without using entanglement between sender and receiver. The\nprotocol exploits the use of equivalent representations, which were overlooked\nin the previous literature.",
    "arxiv_id": "quant-ph/0405095",
    "authors": [
      "G. Chiribella",
      "G. M. D\u0027Ariano",
      "P. Perinotti",
      "M. F. Sacchi"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevLett.93.180503",
    "journal_ref": "Phys. Rev. Lett 93, 180503 (2004)",
    "title": "Efficient use of quantum resources for the transmission of a reference   frame",
    "url": "https://arxiv.org/abs/quant-ph/0405095"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "4b857230-9115-4443-b2d1-d91d8a044abd",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}