{
  "annotation_id": "c9405075-375f-4e85-b0d5-35a43e55d74c",
  "date_created": "2026-03-02T18:01:56.448000Z",
  "date_modified": "2026-03-02T18:01:56.448000Z",
  "file_hash": "c608f3c9783e75d4cd518a67ef9e99783f9e49500f56265d2d124ccba70297f9",
  "private": false,
  "record": {
    "abstract": "We examine stochastic maps in the context of quantum optics. Making use of\nthe master equation, the damping basis, and the Bloch picture we calculate a\nnon-unital, completely positive, trace-preserving map with unequal damping\neigenvalues. This results in what we call the squeezed vacuum channel. A\ngeometrical picture of the effect of stochastic noise on the set of pure state\nqubit density operators is provided. Finally, we study the capacity of the\nsqueezed vacuum channel to transmit quantum information and to distribute EPR\nstates.",
    "arxiv_id": "quant-ph/0211001",
    "authors": [
      "Sonja Daffer",
      "Krzysztof Wodkiewicz",
      "John K. McIver"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.67.062312",
    "journal_ref": "PRA 67, 062312 (2003)",
    "title": "Quantum Markov Channels for Qubits",
    "url": "https://arxiv.org/abs/quant-ph/0211001"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "35f0710a-bbc8-44b8-b96a-cb15c70099c4",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}