{
  "annotation_id": "3b2b51a5-74f6-4194-ac44-238275269493",
  "date_created": "2026-03-02T18:01:38.965000Z",
  "date_modified": "2026-03-02T18:01:38.965000Z",
  "file_hash": "8c5cd2ffdd50d0dbe6883706adb8ca57809214e7b40612be883c6bc4f0fca7f9",
  "private": false,
  "record": {
    "abstract": "A theoretical framework is presented allowing the treatment of quantum\nmessages with components of variable length. To this aim a many-letter space,\nsimiliar to the Fock space, is constructed, generalizing the standard quantum\ninformation theory of block messages of fixed length. In the many-letter space\na length operator can be defined measuring the length of a quantum message,\nwhose eigenspaces are the block Hilbert spaces used in the standard theory.",
    "arxiv_id": "quant-ph/0009052",
    "authors": [
      "Kim J. Bostroem"
    ],
    "categories": [
      "quant-ph"
    ],
    "title": "Concepts of a quantum information theory of many letters",
    "url": "https://arxiv.org/abs/quant-ph/0009052"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "01342a09-c9b7-4091-a5c0-7553d1a106ba",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}