{
  "id": "1504.03703",
  "version": "v1",
  "published": "2015-04-14T20:15:48.000Z",
  "updated": "2015-04-14T20:15:48.000Z",
  "title": "Long-distance entanglement distribution using individual atoms in optical cavities",
  "authors": [
    "Johannes Borregaard",
    "Peter Kómár",
    "Eric M. Kessler",
    "Mikhail D. Lukin",
    "Anders S. Sørensen"
  ],
  "comment": "15 pages, 13 figures",
  "categories": [
    "quant-ph"
  ],
  "abstract": "Individual atoms in optical cavities can provide an efficient interface between stationary qubits and flying qubits (photons), which is an essentiel building block for quantum communication. Furthermore, cavity assisted controlled-not (CNOT) gates can be used for swapping entanglement to long distances in a quantum repeater setup. Nonetheless, dissipation introduced by the cavity during the CNOT may increase the experimental difficulty in obtaining long-distance entanglement distribution using these systems. We analyse and compare a number of cavity-based repeater schemes combining various entanglement generation schemes and cavity assisted CNOT gates. We find that a scheme, where high-fidelity entanglement is first generated in a two-photon detection scheme and then swapped to long distances using a recently proposed heralded CZ-gate exhibits superior performance compared to the other schemes. The heralded gate moves the effect of dissipation from the fidelity to the success probability of the gate thereby enabling high-fidelity entanglement swapping. As a result, high-rate entanglement distribution can be achieved over long distances even for low cooperativities of the atom-cavity systems. This high-fidelity repeater is shown to outperform the other cavity-based schemes by up to two orders of magnitude in the rate for realistic parameters and large distances (1000 km).",
  "revisions": [
    {
      "version": "v1",
      "updated": "2015-04-14T20:15:48.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "individual atoms",
      "optical cavities",
      "long distances",
      "high-fidelity entanglement",
      "entanglement generation schemes"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 15,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}