Title: Long-distance continuous-variable measurement-device-independent quantum key distribution with discrete modulation Show Chinese title

Title: 远距离连续变量测量设备无关量子密钥分发与离散调制

Abstract: We propose a long-distance continuous-variable measurement-device-independent quantum key distribution (CV-MDI-QKD) protocol with discrete modulation. This kind of discrete-modulated schemes have good compatibility with efficient error correction code, which lead to higher reconciliation efficiency even at low signal-to-noise ratio (SNR). Security analysis shows that the proposed protocol is secure against arbitrary collective attacks in the asymptotic limit with proper use of decoy states. And with the using of discrete modulation, the proposed CV-MDI-QKD protocol has simpler implementation and outperform previous protocols in terms of achievable maximal transmission distance, which precisely solve the bottleneck of the original Gaussian-modulated CV-MDI-QKD protocol. Show Chinese abstract

Abstract: 我们提出一种具有离散调制的远距离连续变量测量设备无关量子密钥分发（CV-MDI-QKD）协议。这种离散调制方案与高效的纠错码具有良好兼容性，即使在低信噪比（SNR）下也能实现更高的协商效率。安全性分析表明，通过适当使用诱骗态，所提出的协议在渐近极限下对任意集体攻击是安全的。并且，通过使用离散调制，所提出的CV-MDI-QKD协议具有更简单的实现方式，并在可实现的最大传输距离方面优于之前的协议，从而精确解决了原始高斯调制CV-MDI-QKD协议的瓶颈问题。