Collective attacks and unconditional security in continuous variable quantum key distribution.

@article{Grosshans2005CollectiveAA,
  title={Collective attacks and unconditional security in continuous variable quantum key distribution.},
  author={Fr{\'e}d{\'e}ric Grosshans},
  journal={Physical review letters},
  year={2005},
  volume={94 2},
  pages={020504}
}
We present here an information theoretic study of Gaussian collective attacks on the continuous variable key distribution protocols based on Gaussian modulation of coherent states. These attacks, overlooked in previous security studies, give a finite advantage to the eavesdropper in the experimentally relevant lossy channel, but are not powerful enough to reduce the range of the reverse reconciliation protocols. Secret key rates are given for the ideal case where Bob performs optimal collective… CONTINUE READING
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