2001/09/25 by Frédéric Grosshans, Philippe Grangier · 4 citations
Physics and Astronomy · #quant-ph
paper · pdf · doi:10.1103/physrevlett.88.057902
published as Phys. Rev. Lett. 88, 057902 (2002) · 5 pages, 1 figure. In v2 minor rewriting for clarity, references added
arxiv created 2001/09/25 · arxiv updated 2016/09/08
We propose several methods for quantum key distribution (QKD) based upon the generation and transmission of random distributions of coherent or squeezed states, and we show that they are 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 "non-classical" features such as squeezing. Their security is a direct consequence of the no-cloning theorem, that limits the signal to noise ratio of possible quantum measurements on the transmission line. Our approach can also be used for evaluating various QKD protocols using light with gaussian statistics.