Continuous-variable Quantum Key Distribution protocols with eight-state discrete modulation

TL;DR

This paper introduces an eight-state discrete modulation continuous-variable quantum key distribution protocol with a rigorous security proof, demonstrating high noise tolerance and potential for long-distance optical fiber communication.

Contribution

It presents a novel eight-state modulation protocol with a comprehensive security analysis against collective attacks in realistic conditions.

Findings

High tolerance to excess noise

Potential for hundreds of kilometers in optical fiber

Rigorous security proof against collective attacks

Abstract

We propose a continuous variable quantum key distribution protocol based on discrete modulation of eight-state coherent states. We present a rigorous security proof against the collective attacks considering both of realistic lossy, noisy quantum channels, imperfect detector efficiency, and detector electronic noise. This protocol shows high tolerance against excess noise and it is promising to achieve hundreds distance long in optical fiber base.