{
  "annotation_id": "46c1abbb-a04c-409e-a308-2b312d57f018",
  "date_created": "2026-03-02T18:01:55.800000Z",
  "date_modified": "2026-03-02T18:01:55.800000Z",
  "file_hash": "872fc5853eb6c85465cc7991b0b64414497f9821ec3733151e7a515f7c9e2f30",
  "private": false,
  "record": {
    "abstract": "We propose a scheme for using an unmodulated and unmeasured spin-chain as a\nchannel for short distance quantum communications. The state to be transmitted\nis placed on one spin of the chain and received later on a distant spin with\nsome fidelity. We first obtain simple expressions for the fidelity of quantum\nstate transfer and the amount of entanglement sharable between any two sites of\nan arbitrary Heisenberg ferromagnet using our scheme. We then apply this to the\nrealizable case of an open ended chain with nearest neighbor interactions. The\nfidelity of quantum state transfer is obtained as an inverse discrete cosine\ntransform and as a Bessel function series. We find that in a reasonable time, a\nqubit can be directly transmitted with better than classical fidelity across\nthe full length of chains of up to 80 spins. Moreover, the spin-chain channel\nallows distillable entanglement to be shared over arbitrarily large distances.",
    "arxiv_id": "quant-ph/0212041",
    "authors": [
      "Sougato Bose"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevLett.91.207901",
    "title": "Quantum Communication Through an Unmodulated Spin Chain",
    "url": "https://arxiv.org/abs/quant-ph/0212041"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "f17e4d95-2ef6-4f80-9d7d-a08a6cda132b",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}