{
  "annotation_id": "ef95be30-9dd7-4f44-ae21-c7ebae3eedd1",
  "date_created": "2026-03-02T18:02:03.140000Z",
  "date_modified": "2026-03-02T18:02:03.140000Z",
  "file_hash": "13358f8876b992269b3bf8a71220af4c3ba20cb7125629eb72d4a049387e24fe",
  "private": false,
  "record": {
    "abstract": "The concept of physical twin observables (PTO) for bipartite quantum\nstates,introduced and proved relevant for quantum information theory in recent\nwork, is substantially simplified. The relation of observable and state is\nstudied in detail from the point of view of coherence entropy. Properties of\nthis quantity are further explored. It is shown that, besides for pure states,\nquantum discord (measure of entanglement) can be expressed through the\ncoherence entropy of a PTO complete in relation to the state.",
    "arxiv_id": "quant-ph/0309181",
    "authors": [
      "Fedor Herbut"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1088/0305-4470/36/31/310",
    "journal_ref": "J. Phys. A: Math. Gen. 36 (2003) 8479-8495",
    "title": "The role of coherence entropy of physical twin observables in   entanglement",
    "url": "https://arxiv.org/abs/quant-ph/0309181"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "d4749744-077c-4c70-8f8a-2c54a27102dd",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}