Long distance quantum key distribution with continuous variables

TL;DR

This paper introduces a new continuous-variable quantum key distribution protocol that combines non-Gaussian modulation with reverse reconciliation, demonstrating superior security and performance over existing practical protocols.

Contribution

The paper presents a novel CV-QKD protocol with non-Gaussian modulation and proves its security against collective Gaussian attacks, outperforming existing protocols.

Findings

Outperforms all known practical CV-QKD protocols

Secure against collective Gaussian attacks

Effective even with finite size effects

Abstract

We present a continuous-variable quantum key distribution protocol combining a continuous but slightly non-Gaussian modulation together with a efficient reverse reconciliation scheme. We establish the security of this protocol against collective attacks which correspond to a linear quantum channel. In particular, all Gaussian attacks are considered in our framework. We show that this protocol outperforms all known practical protocols, even taking into account finite size effects.