Continuous variable quantum cryptography using coherent states.

  title={Continuous variable quantum cryptography using coherent states.},
  author={Fr{\'e}d{\'e}ric Grosshans and Philippe Grangier},
  journal={Physical review letters},
  volume={88 5},
We propose several methods for quantum key distribution (QKD) based on the generation and transmission of random distributions of coherent or squeezed states, and we show that they are secure against individual eavesdropping attacks. These protocols require that the transmission of the optical line between Alice and Bob is larger than 50%, but they do not rely on "sub-shot-noise" features such as squeezing. Their security is a direct consequence of the no-cloning theorem, which limits the… CONTINUE READING
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