{
  "annotation_id": "07b69d13-592a-48b2-85a6-eb832f15ab01",
  "date_created": "2026-03-02T18:02:19.409000Z",
  "date_modified": "2026-03-02T18:02:19.409000Z",
  "file_hash": "379e4fdf7933099161dbe2ecd6f42305c3dff87807c27a332ea0363e6bf4474c",
  "private": false,
  "record": {
    "abstract": "we experimentally implement a fault-tolerant quantum key distribution\nprotocol with two photons in a decoherence-free subspace (DFS). It is\ndemonstrated that our protocol can yield good key rate even with large bit-flip\nerror rate caused by collective rotation, while the usual realization of BB84\nprotocol cannot produce any secure final key given the same channel. Since the\nexperiment is performed in polarization space and does not need the calibration\nof reference frame, important applications in free-space quantum communication\nare expected. Moreover, our method can also be used to robustly transmit an\narbitrary two-level quantum state in a type of DFS.",
    "arxiv_id": "quant-ph/0508069",
    "authors": [
      "Q. Zhang",
      "J. Yin",
      "T. -Y. Chen",
      "S. Lu",
      "J. Zhang",
      "X. -Q. Li",
      "T. Yang",
      "X. -B. Wang",
      "J. -W. Pan"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.73.020301",
    "journal_ref": "Phys. Rev. A 73, 020301(R) (2006)",
    "title": "Experimental Fault-Tolerant Quantum Cryptography in a Decoherence-Free   Subspace",
    "url": "https://arxiv.org/abs/quant-ph/0508069"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "a3b4a898-71b8-4a8e-8d2e-dea9ab53b81f",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}