{
  "annotation_id": "54960a49-edf5-42be-94ca-40c20cfff748",
  "date_created": "2026-03-02T18:02:10.047000Z",
  "date_modified": "2026-03-02T18:02:10.047000Z",
  "file_hash": "885664d814f87519a680ae38fa60107c60274af0ff45610d68bc71f5381c50e8",
  "private": false,
  "record": {
    "abstract": "Multiple quantum coherences are typically characterised by their coherence\nnumber and the number of spins that make up the state, though only the\ncoherence number is normally measured. We present a simple set of measurements\nthat extend our knowledge of the multiple quantum state by recording the\ncoherences in both the $x$ basis and the usual $z$ basis. The coherences in the\ntwo bases are related by a similarity transformation. We characterize the\ngrowth of the multiple quantum coherences via measurements in the two bases,\nand show that the rate varies with the coefficient of the driving term in the\nHamiltonian. Such measurements in non-commuting bases provides additional\ninformation over the 1D method about the state of the spin system. In\nparticular the measurement of coherences in a basis other than the usual $z$\nbasis allows us to study the dynamics of the spin system under Hamiltonians,\nsuch as the secular dipolar Hamiltonian, that conserve $z$ basis coherence\nnumber.",
    "arxiv_id": "quant-ph/0408167",
    "authors": [
      "Chandrasekhar Ramanathan",
      "Hyungjoon Cho",
      "Paola Cappellaro",
      "Gregory S. Boutis",
      "David G. Cory"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1016/S0009-2614(02)02020-1",
    "journal_ref": "Chem. Phys. Lett., vol 369 (2003) 311-317",
    "title": "Encoding multiple quantum coherences in non-commuting bases",
    "url": "https://arxiv.org/abs/quant-ph/0408167"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "dc3389c4-d2eb-4490-8eef-7eae9d98a247",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}