{
  "annotation_id": "8254cdaf-81eb-4e9f-876a-3ca3413cc5ce",
  "date_created": "2026-03-02T18:02:48.457000Z",
  "date_modified": "2026-03-02T18:02:48.457000Z",
  "file_hash": "8eaa4b01d71049229bff0d985eaee76cad043cd90b9e9f9507d3336b01a2dee5",
  "private": false,
  "record": {
    "abstract": "We consider the interaction of a quantum system (spin-1/2) with a macroscopic\nquantum apparatus (harmonic oscillator) which in turn is coupled to a bath of\nharmonic oscillators. Exact solutions of the Markovian Master equation show\nthat the reduced density matrix of the system-apparatus combine decoheres to a\nstatistical mixture where up and down spins eventually correlate with pointer\nstates of the apparatus. For the zero temperature bath these pointer states\nturn out to be coherent states of the harmonic oscillator for arbitrary initial\nstates of the apparatus. For a high temperature bath pointer states are\nGaussian distributions (generalized coherent states). For both cases, the\noff-diagonal elements in spin-space decohere over a time scale which goes\ninversely as the square of the \"separation\" between the \"pointers\". Our exact\nresults also demonstrate in an unambiguous way that the pointer states in this\nmeasurement model emerge independent of the initial state of the apparatus.",
    "arxiv_id": "quant-ph/9909005",
    "authors": [
      "Anu Venugopalan"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.61.012102",
    "title": "Pointer states via Decoherence in a Quantum Measurement",
    "url": "https://arxiv.org/abs/quant-ph/9909005"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "a93455b0-ec65-4c43-9ec2-80c6b69480c9",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}