{
  "annotation_id": "10f967c5-dbcc-41ef-9c44-efa07de0b9d0",
  "date_created": "2026-03-02T18:01:59.136000Z",
  "date_modified": "2026-03-02T18:01:59.136000Z",
  "file_hash": "f7ffce434f0439b0a7701cc1046a4b069f9dab0113da1503096c8b4940ccd746",
  "private": false,
  "record": {
    "abstract": "In this paper we explore the quantum behaviour of a SQUID ring which has a\nsignificant Josephson coupling energy. We show that that the eigenfunctions of\nthe Hamiltonian for the ring can be used to create macroscopic quantum\nsuperposition states of the ring. We also show that the ring potential may be\nutilised to squeeze coherent states. With the SQUID ring as a strong contender\nas a device for manipulating quantum information, such properties may be of\ngreat utility in the future. However, as with all candidate systems for quantum\ntechnologies, decoherence is a fundamental problem. In this paper we apply an\nopen systems approach to model the effect of coupling a quantum mechanical\nSQUID ring to a thermal bath. We use this model to demonstrate the manner in\nwhich decoherence affects the quantum states of the ring.",
    "arxiv_id": "quant-ph/0307175",
    "authors": [
      "M. J. Everitt",
      "T. D. Clark",
      "P. B. Stiffell",
      "A. Vourdas",
      "J. F. Ralph",
      "R. J. Prance",
      "H. Prance"
    ],
    "categories": [
      "quant-ph",
      "cond-mat.supr-con"
    ],
    "doi": "10.1103/PhysRevA.69.043804",
    "journal_ref": "Phys. Rev. A 69, 043804 (2004)",
    "title": "Superconducting Analogues of Quantum Optical Phenomena: Macroscopic   Quantum Superpositions and Squeezing in a SQUID Ring",
    "url": "https://arxiv.org/abs/quant-ph/0307175"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "5db409a8-03ad-43ff-bd31-63793528f545",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}