Cloning and Optimal Gaussian individual attacks for continuous-variable quantum key distribution using coherent states and reverse reconciliation

Abstract

We investigate the security of continuous-variable (CV) quantum key distribution (QKD) using coherent states and reverse reconciliation against Gaussian individual attacks based on an optimal Gaussian $1\to 2$ cloning machine. We provide an implementation of the optimal Gaussian individual attack. we also find a Bell-measurement attack which works without delayed choice of measurements and has better performance than the cloning attack.

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References in corpus (8)

• Quantum key distribution using gaussian-modulated coherent states
• Quantum Cryptography without Switching
• Continuous Variable Quantum Cryptography - beating the 3 dB loss limit
• Virtual Entanglement and Reconciliation Protocols for Quantum Cryptography with Continuous Variables
• Security of quantum cryptography using balanced homodyne detection
• A practical limitation for continuous-variable quantum cryptography using coherent states
• Security of Continuous-variable quantum cryptography using coherent states: Decline of postselection advantage
• Reversibility of continuous-variable quantum cloning

Cited by in corpus (6)

• Continuous variable quantum key distribution in non-Markovian channels
• Security of coherent state quantum cryptography in the presence of Gaussian noise
• Experimental Demonstration of Continuous Variable Cloning with Phase-Conjugate Inputs
• Tight bound on coherent states quantum key distribution with heterodyne detection
• Quantum amplification and purification of noisy coherent states
• Secret key rate of a continuous-variable quantum-key-distribution scheme when the detection process is inaccessible to eavesdroppers