{
  "annotation_id": "63a48f7f-1b46-4206-80fa-95c3c3c8261a",
  "date_created": "2026-03-02T18:02:34.709000Z",
  "date_modified": "2026-03-02T18:02:34.709000Z",
  "file_hash": "4311c2e2cd27544c3a5ed90e9d3002356e61c5090befb545090e77670dacc2f6",
  "private": false,
  "record": {
    "abstract": "We study decoherence of two non-interacting qubits. The environment and its\ninteraction with the qubits are modelled by random matrices. Decoherence,\nmeasured in terms of purity, is calculated in linear response approximation.\nMonte Carlo simulations illustrate the validity of this approximation and of\nits extension by exponentiation. The results up to this point are also used to\nstudy one qubit decoherence. Purity decay of entangled and product states are\nqualitatively similar though for the latter case it is slower. Numerical\nstudies for a Bell pair as initial state reveal a one to one correspondence\nbetween its decoherence and its internal entanglement decay. For strong and\nintermediate coupling to the environment this correspondence agrees with the\none for Werner states. In the limit of a large environment the evolution\ninduces a unital channel in the two qubits, providing a partial explanation for\nthe relation above.",
    "arxiv_id": "quant-ph/0702161",
    "authors": [
      "C. Pineda",
      "T. Gorin",
      "T. H. Seligman"
    ],
    "categories": [
      "quant-ph",
      "cond-mat.stat-mech"
    ],
    "doi": "10.1088/1367-2630/9/4/106",
    "journal_ref": "New J. Phys. 9, 106,(2007)",
    "title": "Decoherence of two qubit systems: A random matrix description",
    "url": "https://arxiv.org/abs/quant-ph/0702161"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "732da27f-9244-47e5-9d60-53c6bc2d9a50",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}