{
  "annotation_id": "7025091d-dad1-473f-b27c-ac4026ea9c1a",
  "date_created": "2026-03-02T18:01:52.159000Z",
  "date_modified": "2026-03-02T18:01:52.159000Z",
  "file_hash": "7b0a94945abecae990b18690e9dab34edb44a7d2e62546a949348df8b88ea400",
  "private": false,
  "record": {
    "abstract": "In Shannon information theory the capacity of a memoryless communication\nchannel cannot be increased by the use of feedback. In quantum information\ntheory the no-cloning theorem means that noiseless copying and feedback of\nquantum information cannot be achieved. In this paper, quantum feedback is\ndefined as the unlimited use of a noiseless quantum channel from receiver to\nsender. Given such quantum feedback, it is shown to provide no increase in the\nentanglement--assisted capacities of a memoryless quantum channel, in direct\nanalogy to the classical case. It is also shown that in various cases of\nnon-assisted capacities, feedback may increase the capacity of memoryless\nquantum channels.",
    "arxiv_id": "quant-ph/0209076",
    "authors": [
      "Garry Bowen"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1109/TIT.2004.834749",
    "journal_ref": "IEEE Trans. Inform. Theory 50, 2429-2433 (2004)",
    "title": "Quantum Feedback Channels",
    "url": "https://arxiv.org/abs/quant-ph/0209076"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "f3e43d3b-b2c8-4dd4-aad9-69a3fbe51141",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}