BibTeX Source

@Article{Branciard2008,
  author =       "C. Branciard and N. Gisin and V. Scarani",
  title =        "Upper bounds for the security of two distributed-phase reference protocols of
                 quantum cryptography",
  journal =      "New Journal of Physics",
  year =         "2008",
  volume =       "10",
  pages =        "013031",
  abstract =     "The differential-phase-shift (DPS) and the coherent-one-way (COW) are among the
                 most practical protocols for quantum cryptography, and are therefore the object of
                 fast-paced experimental developments. The assessment of their security is also a
                 challenge for theorists: the existing tools, that allow to prove security against
                 the most general attacks, do not apply to these two protocols in any
                 straightforward way. We present new upper bounds for their security in the limit of
                 large distances (d greater than or similar to 50 km with typical values in optical
                 fibers) by considering a large class of collective attacks, namely those in which
                 the adversary attaches ancillary quantum systems to each pulse or to each pair of
                 pulses. We introduce also two modified versions of the COW protocol, which may
                 prove more robust than the original one.",
  doi =          "10.1088/1367-2630/10/1/013031",
  owner =        "cc",
  sn =           "1367-2630",
  timestamp =    "2010.08.20",
  ut =           "WOS:000253085100003",
}