On Secure Quantum Key Distribution Using Continuous Variables of Single Photons

Details On Secure Quantum Key Distribution Using Continuous Variables of Single Photons On Secure Quantum Key Distribution Using Continuous Variables of Single Photons

2007-11-29

arxiv.org/abs/0711.4631v1

Physics

Quantum Physics

5 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.100.110504

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.

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