{
  "annotation_id": "19898056-23be-4179-8cfe-124f29401a68",
  "date_created": "2026-03-02T18:02:33.581000Z",
  "date_modified": "2026-03-02T18:02:33.581000Z",
  "file_hash": "a1ee7fb61713f529078ae4beacf37b52a7b09e91d9dbcf6ffac8cfb41e7eb9de",
  "private": false,
  "record": {
    "abstract": "We examine entanglement dynamics via concurrence among four two-state systems\nlabeled $A, ~a, ~B, ~b$. The four systems are arranged on an addressable\n\"lattice\" in such a way that $A$ and $a$ at one location labeled $Aa$ can\ninteract with each other via excitation exchange, and the same for $B$ and $b$\nat location $Bb$. The $Aa$ location is prepared entangled with the $Bb$\nlocation, but their mutual complete isolation prevents interaction in the\ninterval between actions of an external addressing agent. There are six\npairwise concurrences on the lattice, and we follow their evolution in the\ninterval between external actions. We show how entanglement evolves and may\nexhibit the non-analytic effect termed entanglement sudden death (ESD), with\nperiodic recovery. These loss and gain processes may be interpreted as\nentanglement transfer between the subsystems.",
    "arxiv_id": "quant-ph/0701111",
    "authors": [
      "M. Yonac",
      "Ting Yu",
      "J. H. Eberly"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1088/0953-4075/40/9/S02",
    "journal_ref": "J. Phys. B 40, S45 (2007)",
    "title": "Pairwise Concurrence Dynamics: A Four-Qubit Model",
    "url": "https://arxiv.org/abs/quant-ph/0701111"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "57e9b905-ab8c-4dfd-87c8-8056e2ce2aa9",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}