{
  "annotation_id": "562e50bf-ecf8-4646-bcda-b9ea42e6b5ea",
  "date_created": "2026-03-02T18:02:15.897000Z",
  "date_modified": "2026-03-02T18:02:15.897000Z",
  "file_hash": "1f0571ddbcfada215a72032f55e7f76c700ac5b2533bbc1b46a338032fe55c10",
  "private": false,
  "record": {
    "abstract": "We study the exact evolution of two non-interacting qubits, initially in a\nBell state, in the presence of an environment, modeled by a kicked Ising spin\nchain. Dynamics of this model range from integrable to chaotic and we can\nhandle numerics for a large number of qubits. We find that the entanglement (as\nmeasured by concurrence) of the two qubits has a close relation to the purity\nof the pair, and follows an analytic relation derived for Werner states. As a\ncollateral result we find that an integrable environment causes quadratic decay\nof concurrence, while a chaotic environment causes linear decay.",
    "arxiv_id": "quant-ph/0503177",
    "authors": [
      "Carlos Pineda",
      "Thomas H. Seligman"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.73.012305",
    "journal_ref": "Phys. Rev. A 73(1), 012305, (2006)",
    "title": "Evolution of pairwise entanglement in a coupled n-body system",
    "url": "https://arxiv.org/abs/quant-ph/0503177"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "649030ce-6828-4e4a-8f59-d0345d66e513",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}