{
  "annotation_id": "a3dce4b6-1165-4d1e-9ea1-75b9ab3d7153",
  "date_created": "2026-03-02T18:02:24.276000Z",
  "date_modified": "2026-03-02T18:02:24.276000Z",
  "file_hash": "41437bbe4cfee897dfaefc93f0744c43e5329faa885a8a28e5713bd1d622bf39",
  "private": false,
  "record": {
    "abstract": "We address the problem of completely characterizing multi-particle states\nincluding loss of information to unobserved degrees of freedom. In systems\nwhere non-classical interference plays a role, such as linear-optics quantum\ngates, such information can degrade interference in two ways, by decoherence\nand by distinguishing the particles. Distinguishing information, often the\nlimiting factor for quantum optical devices, is not correctly described by\nprevious state-reconstruction techniques, which account only for decoherence.\nWe extend these techniques and find that a single modified density matrix can\ncompletely describe partially-coherent, partially-distinguishable states. We\nuse this observation to experimentally characterize two-photon polarization\nstates in single-mode optical fiber.",
    "arxiv_id": "quant-ph/0601134",
    "authors": [
      "R. B. A. Adamson",
      "L. K. Shalm",
      "M. W. Mitchell",
      "A. M. Steinberg"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevLett.98.043601",
    "journal_ref": "Phys. Rev. Lett. 98, 043601 (2007)",
    "title": "State Tomography: Hidden Differences",
    "url": "https://arxiv.org/abs/quant-ph/0601134"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "acfe5c14-68ae-4b79-9dde-c63de18bad72",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}