{
  "annotation_id": "23e61595-d8b9-44a7-a842-db458c73b009",
  "date_created": "2026-03-02T18:02:10.299000Z",
  "date_modified": "2026-03-02T18:02:10.299000Z",
  "file_hash": "cd7dac0a63819beac17358b77a2a6b883634ca158808c62db6732f66fd3c81fb",
  "private": false,
  "record": {
    "abstract": "We use a disordered anti-ferromagnetic spin-1/2 chain with anisotropic\nexchange coupling to model an array of interacting qubits. All qubits have the\nsame level spacing, except two, which are called the defects of the chain. The\nlevel spacings of the defects are equal and much larger than all the others. We\ninvestigate how the entanglement between the two defects depends on the\nanisotropy of the system. When the anisotropy coupling is much larger than the\nenergy difference between a defect and an ordinary qubit, the two defects\nbecome strongly entangled. Small anisotropies, on the contrary, may decrease\nthe entanglement, which is, in this case, also much affected by the number of\nexcitations. The analysis is made for nearest neighbor and next-nearest\nneighbor defects. The decrease in the entanglement for nearest neighbor defects\nis not very significant, especially in large chains.",
    "arxiv_id": "quant-ph/0408062",
    "authors": [
      "L. F. Santos",
      "G. Rigolin"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.71.032321",
    "journal_ref": "Phys. Rev. A 71, 032321 (2005)",
    "title": "Effects of the interplay between interaction and disorder in bipartite   entanglement",
    "url": "https://arxiv.org/abs/quant-ph/0408062"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "e93c5ec7-88cb-4a3d-96d4-4c73624a2d7e",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}