{
  "annotation_id": "f2a5c428-607c-481f-8a14-945f6538ac7c",
  "date_created": "2026-03-02T18:00:42.156000Z",
  "date_modified": "2026-03-02T18:00:42.156000Z",
  "file_hash": "f4f012fd5b1173994385d7a7ae9ea1b6e74cd98a7795f1048d9a295d329c9d99",
  "private": false,
  "record": {
    "abstract": "Enhancement of optical Kerr nonlinearity for self-action by\nelectro-magnetically induced transparency in a four-level atomic system\nincluding dephasing between the ground states is studied in detail by solving\nthe density matrix equations for the atomic levels. We discern three major\ncontributions, from energy shifts of the ground states induced by the probe\nlight, to the third-order susceptibility in the four-level system. In this\nfour-level system with the frequency-degenerate probes, quantum interference\namongst the three contributions can, not only enhance the third-order\nsusceptibility more effectively than in the three-level system with the same\ncharacteristic parameters, but also make the ratio between its real and\nimaginary part controllable. Due to dephasing between the two ground states and\nconstructive quantum interference, the most effective enhancement generally\noccurs at an offset that is determined by the atomic transition frequency\ndifference and the coupling Rabi frequency.",
    "arxiv_id": "physics/0211005",
    "authors": [
      "Tao Hong",
      "Michael Wong Jack",
      "Makoto Yamashita",
      "Takaaki Mukai"
    ],
    "categories": [
      "physics.optics"
    ],
    "doi": "10.1016/S0030-4018(02)02145-4",
    "title": "Enhanced Kerr nonlinearity for self-action via atomic coherence in a   four-level atomic system",
    "url": "https://arxiv.org/abs/physics/0211005"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "98dee030-794d-41f4-88a8-5f9f1f2faaa5",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}