{
  "annotation_id": "a3a22b7a-42b3-4061-ba9e-46c1eecf67b5",
  "date_created": "2026-03-02T18:02:30.283000Z",
  "date_modified": "2026-03-02T18:02:30.283000Z",
  "file_hash": "29503deda6ad51774600bfa7e472fb04120da433e7e548a026b7f4ffeed1e432",
  "private": false,
  "record": {
    "abstract": "A critical step in experimental quantum information processing (QIP) is to\nimplement control of quantum systems protected against decoherence via\ninformational encodings, such as quantum error correcting codes, noiseless\nsubsystems and decoherence free subspaces. These encodings lead to the promise\nof fault tolerant QIP, but they come at the expense of resource overheads.\n  Part of the challenge in studying control over multiple logical qubits, is\nthat QIP test-beds have not had sufficient resources to analyze encodings\nbeyond the simplest ones. The most relevant resources are the number of\navailable qubits and the cost to initialize and control them. Here we\ndemonstrate an encoding of logical information that permits the control over\nmultiple logical qubits without full initialization, an issue that is\nparticularly challenging in liquid state NMR. The method of subsystem\npseudo-pure state will allow the study of decoherence control schemes on up to\n6 logical qubits using liquid state NMR implementations.",
    "arxiv_id": "quant-ph/0610269",
    "authors": [
      "P. Cappellaro",
      "J. S. Hodges",
      "T. F. Havel",
      "D. G. Cory"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.75.042321",
    "journal_ref": "Phys. Rev. A 75, 042321 (2007)",
    "title": "Subsystem Pseudo-pure States",
    "url": "https://arxiv.org/abs/quant-ph/0610269"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "c0dae12a-a85d-4b76-b774-0bd46aca5ca1",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}