Efficient-phase-encoding protocols for continuous-variable quantum key distribution using coherent states and postselection

Abstract

We propose efficient-phase-encoding protocols for continuous-variable quantum key distribution using coherent states and postselection. By these phase encodings, the probability of basis mismatch is reduced and total efficiency is increased. We also propose mixed-state protocols by omitting a part of classical communication steps in the efficient-phase-encoding protocols. The omission implies a reduction of information to an eavesdropper and possibly enhances the security of the protocols. We investigate the security of the protocols against individual beam splitting attack.

RevTeX4, 8 pages, 9 figures

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• Unconditional security proof of long-distance continuous-variable quantum key distribution with discrete modulation
• Continuous Variable Quantum Cryptography using Two-Way Quantum Communication
• Coherent State Quantum Key Distribution with Multi Letter Phase-Shift Keying
• A simple proof that Gaussian attacks are optimal among collective attacks against continuous-variable quantum key distribution with a Gaussian modulation
• A security proof of continuous-variable QKD using three coherent states
• Experimental Demonstration of Post-Selection based Continuous Variable Quantum Key Distribution in the Presence of Gaussian Noise
• Teleportation-Based Continuous Variable Quantum Cryptography
• Hide and seek with quantum resources: New and modified protocols for quantum steganography
• Secret key rate of a continuous-variable quantum-key-distribution scheme when the detection process is inaccessible to eavesdroppers
• Optimal continuous variable quantum teleportation protocol for realistic settings
• Security against collective attacks for a continuous-variable quantum key distribution protocol using homodyne detection and postselection
• A polarization quantum key distribution scheme based on phase matching