{
  "annotation_id": "12124f50-ab24-4f33-94c6-c4bafd035c55",
  "date_created": "2026-03-02T18:01:56.336000Z",
  "date_modified": "2026-03-02T18:01:56.336000Z",
  "file_hash": "6c794d3a58da8c4e245441b3990e0a20ea9eed0f6f9590581f0f990782ac02c0",
  "private": false,
  "record": {
    "abstract": "We show that, in a system with defects, two-particle states may experience\ndestructive quantum interference, or antiresonance. It prevents an excitation\nlocalized on a defect from decaying even where the decay is allowed by energy\nconservation. The system studied is a qubit chain or an equivalent spin chain\nwith an anisotropic ($XXZ$) exchange coupling in a magnetic field. The chain\nhas a defect with an excess on-site energy. It corresponds to a qubit with the\nlevel spacing different from other qubits. We show that, because of the\ninteraction between excitations, a single defect may lead to multiple localized\nstates. The energy spectra and localization lengths are found for\ntwo-excitation states. The localization of excitations facilitates the\noperation of a quantum computer. Analytical results for strongly anisotropic\ncoupling are confirmed by numerical studies.",
    "arxiv_id": "quant-ph/0303130",
    "authors": [
      "L. F. Santos",
      "M. I. Dykman"
    ],
    "categories": [
      "quant-ph",
      "cond-mat"
    ],
    "doi": "10.1103/PhysRevB.68.214410",
    "title": "Two-particle localization and antiresonance in disordered spin and qubit   chains",
    "url": "https://arxiv.org/abs/quant-ph/0303130"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "7eb251a4-7e8b-46bc-b6ad-751f1c65998d",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}