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We analyse the distribution of secure keys using quantum cryptography basedon the continuous variable degree of freedom of entangled photon pairs. Wederive the information capacity of a scheme based on the spatial entanglementof photons from a realistic source, and show that the standard measures ofsecurity known for quadrature-based continuous variable quantum cryptography(CV-QKD) are inadequate. A specific simple eavesdropping attack is analysed toilluminate how secret information may be distilled well beyond the bounds ofthe usual CV-QKD measures.

On Secure Quantum Key Distribution Using Continuous Variables of Single Photons