Fake state attack on practically decoy state quantum key distribution

Making the decoy-state measurement-device-independent quantum key distribution practically useful

The relatively low key rate seems to be the major barrier to its practical use for the decoy state measurement device independent quantum key distribution (MDIQKD). We present a 4-intensity protocol for the decoy-state MDIQKD that hugely raises the key rate, especially in the case the total data size is not large. Also, calculation shows that our method makes it possible for secure private communication with {\em fresh} keys generated from MDIQKD with a delay time of only a few seconds.

Practical Attacks on Decoy State Quantum Key Distribution Systems with Detector Efficiency Mismatch

To the active basis choice decoy state quantum key distribution systems with detector efficiency mismatch, we present a modified attack strategy, which is based on faked states attack, with quantum nondemolition measurement ability to restress the threat of detector efficiency mismatch. Considering that perfect quantum nondemolition measurement ability dose not exist in real life, we also propose a practical attack strategy using photon number resolving detectors. Theoretical analysis and numerical simulation results show that, without changing the channel, our attack strategies are serious th…

Practical high-dimensional quantum key distribution with decoy states

High-dimensional quantum key distribution (HD-QKD) allows two parties to generate multiple secure bits of information per detected photon. In this work, we show that decoy state protocols can be practically implemented for HD-QKD using only one or two decoy states. HD-QKD with two decoy states, under realistic experimental constraints, can generate multiple secure bits per coincidence at distances over 200 km and at rates similar to those achieved by a protocol with infinite decoy states. Furthermore, HD-QKD with only one decoy state is practical at short distances, where it is almost as secur…

带源和探测器缺陷的诱骗态QKD的有限密钥安全性分析

Finite-key security analysis of decoy-state QKD with source and detector imperfections

提出一种综合解析有限密钥安全性证明，同时考虑发射器和接收器的多种实际缺陷，包括态制备缺陷、比特和基矢侧信道泄漏与相关性、设置无关强度波动及探测效率失配。

Fake-signal-and-cheating attack on quantum secret sharing

We present a fake-signal-and-cheating attack strategy for the dishonest agent in quantum secret sharing (QSS) to steal the information of the other agents' fully and freely. It is found that almost all the QSS protocols existing, such as the two famous QSS protocols, the Hillery-Bu$\check{z}$ek-Berthiaume [Phys. Rev. A \textbf{59}, 1829 (1999)] and the Karlsson-Koashi-Imoto [Phys. Rev. A \textbf{59}, 162 (1999)], can be eavesdropped freely if the process for the eavesdropping check is accomplished with the cooperation of the dishonest agent. He can sends a fake signal to the other agents after…

Rényi安全框架在应对相干攻击时应用于decoy-state QKD的研究

Rényi security framework against coherent attacks applied to decoy-state QKD

本文提出了一个适用于相干攻击下固定和可变长度QKD协议的有限尺寸安全性证明框架，通过引入夹心条件Rényi熵评估等新数值技术，实现了更广的适用范围和更优的密钥率，特别是在小块尺寸下表现突出。