Security of Continuous-variable quantum cryptography using coherent states: Decline of postselection advantage

Abstract

We investigate the security of continuous-variable (CV) quantum key distribution (QKD) using coherent states in the presence of quadrature excess noise. We consider an eavesdropping attack which uses a linear amplifier and beam splitter. This attack makes a link between beam-splitting attack and intercept-resend attack (classical teleportation attack). We also show how postselection loses its efficiency in a realistic channel.

Revtex4, 4 pages, 2 figures

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• Strong quantitative benchmarking of quantum optical devices
• Quantum Forbidden-Interval Theorems for Stochastic Resonance
• Cloning and Optimal Gaussian individual attacks for continuous-variable quantum key distribution using coherent states and reverse reconciliation
• Experimental implementation of non-Gaussian attacks on a continuous-variable quantum key distribution system