{
  "annotation_id": "cbd58b5e-6091-4b5d-8a45-a6aa5ca2d242",
  "date_created": "2026-03-02T18:02:41.168000Z",
  "date_modified": "2026-03-02T18:02:41.168000Z",
  "file_hash": "26aa25ef0e457f58ce782d329ec413db4daf80359e33635d5319e14ba5e21374",
  "private": false,
  "record": {
    "abstract": "In this paper we study a model quantum register $\\cal R$ made of $N$ replicas\n(cells) of a given finite-dimensional quantum system S. Assuming that all cells\nare coupled with a common environment with equal strength we show that, for $N$\nlarge enough, in the Hilbert space of $\\cal R$ there exists a linear subspace\n${\\cal C}_N$ which is dynamically decoupled from the environment. The states in\n${\\cal C}_N$ evolve unitarily and are therefore decoherence-dissipation free.\nThe space ${\\cal C}_N$ realizes a noiseless quantum code in which information\ncan be stored, in principle, for arbitrarily long time without being affected\nby errors.",
    "arxiv_id": "quant-ph/9705044",
    "authors": [
      "P. Zanardi",
      "M. Rasetti"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevLett.79.3306",
    "journal_ref": "Phys.Rev.Lett.79:3306-3309,1997",
    "title": "Noiseless Quantum Codes",
    "url": "https://arxiv.org/abs/quant-ph/9705044"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "10038115-ea7c-4fb6-b18a-46ae52f59c93",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}