{
  "annotation_id": "ff7c9d9a-ab2f-4f6a-ba85-6f838e9afbf8",
  "date_created": "2026-03-02T18:02:17.052000Z",
  "date_modified": "2026-03-02T18:02:17.052000Z",
  "file_hash": "dd4663be0b04ebe53ccdf190d751c6248df57721f80cc777c204d974ebae1f80",
  "private": false,
  "record": {
    "abstract": "The effect induced by an environment on a composite quantum system is\nstudied. The model considers the composite system as comprised by a subsystem A\ncoupled to a subsystem B which is also coupled to an external environment. We\nstudy all possible four combinations of subsystems A and B made up with a\nharmonic oscillator and an upside down oscillator. We analyzed the decoherence\nsuffered by subsystem A due to an effective environment composed by subsystem B\nand the external reservoir. In all the cases we found that subsystem A\ndecoheres even though it interacts with the environment only through its sole\ncoupling to B. However, the effectiveness of the diffusion depends on the\nunstable nature of subsystem A and B. Therefore, the role of this degree of\nfreedom in the effective environment is analyzed in detail",
    "arxiv_id": "quant-ph/0507107",
    "authors": [
      "Fernando C. Lombardo",
      "Paula I. Villar"
    ],
    "categories": [
      "quant-ph",
      "cond-mat.other",
      "cond-mat.stat-mech",
      "hep-ph"
    ],
    "doi": "10.1142/S0217979206034959",
    "journal_ref": "Int.J.Mod.Phys.B20:2951-2976,2006",
    "title": "Decoherence in composite quantum open systems: the effectiveness of   unstable degrees of freedom",
    "url": "https://arxiv.org/abs/quant-ph/0507107"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "3c522b43-eb72-43ac-b357-d03d9e53b8a4",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}