On Secure Quantum Key Distribution Using Continuous Variables of Single Photons
arXiv:0711.4631 · doi:10.1103/PhysRevLett.100.110504
Abstract
We analyse the distribution of secure keys using quantum cryptography based on the continuous variable degree of freedom of entangled photon pairs. We derive the information capacity of a scheme based on the spatial entanglement of photons from a realistic source, and show that the standard measures of security known for quadrature-based continuous variable quantum cryptography (CV-QKD) are inadequate. A specific simple eavesdropping attack is analysed to illuminate how secret information may be distilled well beyond the bounds of the usual CV-QKD measures.
5 pages, 2 figures
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