Continuous variable quantum cryptography using coherent states

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  • 18 September 2001
Abstract
We propose several methods for quantum key distribution (QKD), based upon the generation and transmission of random distributions of coherent or squeezed states. We show that these protocols are secure against individual eavesdropping attacks, provided that the transmission of the optical line between Alice and Bob is larger than 50 %. The security of the protocol is related to the no-cloning theorem, that limits the signal to noise ratio of possible quantum measurements on the transmission line, even though the transmitted light has no "non-classical" feature such as squeezing. We show also that our approach can be used for evaluating any QKD protocol using light with gaussian statistics.

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