Secure quantum key distribution using continuous variables of single photons |
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Authors: | Zhang Lijian Silberhorn Christine Walmsley Ian A |
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Institution: | Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom. l.zhang1@physics.ox.ac.uk |
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Abstract: | We analyze 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 analyzed to illuminate how secret information may be distilled well beyond the bounds of the usual CV-QKD measures. |
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