{
  "annotation_id": "81088a70-5a95-465b-bb1f-c287e1ea0739",
  "date_created": "2026-03-02T18:02:16.418000Z",
  "date_modified": "2026-03-02T18:02:16.418000Z",
  "file_hash": "e882844c5cfa86e8c23f836f0c1e83320ec0ef23db3a0e3fe3c81f041ce7e32b",
  "private": false,
  "record": {
    "abstract": "Let an EPR source which generates maximally entangled pairs be located so\nthat it has distances $L_1$ and $L_2$ to two users. After taking into account\nvarious effects like loss of photons, deficiencies in the source and detectors,\nan entangled pair traveling through the channel may loose its perfect\ncorrelation due to errors in the channel. How the entanglement of the received\npair depends on the above distances and the local properties of the channels\nused for this transmission? What is the best location of the source if we want\nto achieve the highest fidelity? What is the threshold distance beyond which\nthe entanglement of the pair vanishes and becomes useless for using in\nteleportation. We discuss these problems for the Pauli channel which simulates\nthe effect of optical fibers and possibly the atmosphere on the\npolarization-entangled photons.",
    "arxiv_id": "quant-ph/0504177",
    "authors": [
      "A. Bayat",
      "V. Karimipour",
      "I. Marvian"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1016/j.physleta.2006.02.009",
    "journal_ref": "Phys. Lett. A 335 (2006) 81-86.",
    "title": "How the quality of a received EPR pair depends on the distances from an   EPR source?",
    "url": "https://arxiv.org/abs/quant-ph/0504177"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "8f9c4506-ac21-4072-85b1-54c3655a7da3",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}