{
  "annotation_id": "d88cca80-4dc7-4708-bc4a-a34f33716a86",
  "date_created": "2026-03-02T18:02:34.364000Z",
  "date_modified": "2026-03-02T18:02:34.364000Z",
  "file_hash": "c91053da1fce1b935502256dbb42fdd57d66895e5e1a72c833fee6c416271c1f",
  "private": false,
  "record": {
    "abstract": "It is known that it is impossible to unambiguously distinguish the four Bell\nstates encoded in pairs of photon polarizations using only linear optics.\nHowever, hyperentanglement, the simultaneous entanglement in more than one\ndegree of freedom, has been shown to assist the complete Bell analysis of the\nfour Bell states (given a fixed state of the other degrees of freedom). Yet\nintroducing other degrees of freedom also enlarges the total number of\nBell-like states. We investigate the limits for unambiguously distinguishing\nthese Bell-like states. In particular, when the additional degree of freedom is\nqubit-like, we find that the optimal one-shot discrimination schemes are to\ngroup the 16 states into 7 distinguishable classes, and that an unambiguous\ndiscrimination is possible with two identical copies.",
    "arxiv_id": "quant-ph/0703117",
    "authors": [
      "Tzu-Chieh Wei",
      "Julio T. Barreiro",
      "Paul G. Kwiat"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.75.060305",
    "journal_ref": "Phys. Rev. A 75, 060305(R) (2007)",
    "title": "Hyperentangled Bell-state analysis",
    "url": "https://arxiv.org/abs/quant-ph/0703117"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "92d908dd-04c0-4f67-953b-c0f9f5e06b16",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}