{
  "annotation_id": "bc0846c8-6967-4a1d-ab74-c2d483fe87f7",
  "date_created": "2026-03-02T18:02:31.149000Z",
  "date_modified": "2026-03-02T18:02:31.149000Z",
  "file_hash": "83acaf4eb9e3d9ce91aa3f7dea821017ff48ec836d9d91c8fc769eff1d905ef3",
  "private": false,
  "record": {
    "abstract": "We introduce a figure of merit for a quantum memory which measures the\npreservation of entanglement between a qubit stored in and retrieved from the\nmemory and an auxiliary qubit. We consider a general quantum memory system\nconsisting of a medium of two level absorbers, with the qubit to be stored\nencoded in a single photon. We derive an analytic expression for our figure of\nmerit taking into account Gaussian fluctuations in the Hamiltonian parameters,\nwhich for example model inhomogeneous broadening and storage time dephasing.\nFinally we specialize to the case of an atomic quantum memory where\nfluctuations arise predominantly from Doppler broadening and motional\ndephasing.",
    "arxiv_id": "quant-ph/0608098",
    "authors": [
      "K. Surmacz",
      "J. Nunn",
      "F. C. Waldermann",
      "Z. Wang",
      "I. Walmsley",
      "D. Jaksch"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.74.050302",
    "journal_ref": "Phys. Rev. A (74), 050302(R) (2006)",
    "title": "Entanglement fidelity of quantum memories",
    "url": "https://arxiv.org/abs/quant-ph/0608098"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "0ff53647-df5a-4b65-9fc9-287d2cd95e26",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}