{
  "id": "quant-ph/0411047",
  "version": "v5",
  "published": "2004-11-08T12:49:13.000Z",
  "updated": "2005-02-21T05:34:34.000Z",
  "title": "A decoy-state protocol for quantum cryptography with 4 intensities of coherent states",
  "authors": [
    "Xiang-Bin Wang"
  ],
  "doi": "10.1103/PhysRevA.72.012322",
  "categories": [
    "quant-ph"
  ],
  "abstract": "In order to beat any type of photon-number-splitting attack, we propose a protocol for quantum key distributoin (QKD) using 4 different intensities of pulses. They are vacuum and coherent states with mean photon number $\\mu,\\mu'$ and $\\mu_s$. $\\mu_s$ is around 0.55 and this class of pulses are used as the main signal states. The other two classes of coherent states ($\\mu,\\mu'$) are also used signal states but their counting rates should be studied jointly with the vacuum. We have shown that, given the typical set-up in practice, the key rate from the main signal pulses is quite close to the theoretically allowed maximal rate in the case given the small overall transmittance of $10^{-4}$.",
  "revisions": [
    {
      "version": "v5",
      "updated": "2005-02-21T05:34:34.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "coherent states",
      "decoy-state protocol",
      "quantum cryptography",
      "intensities",
      "mean photon number"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Phys. Rev. A"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}