Modulation leakage vulnerability in continuous-variable quantum key distribution

Minimization of information leakage in continuous-variable quantum key distribution

A communication protocol based on a Gaussian modulation of squeezed states in a single quadrature and measured via homodyne detection can completely eliminate information leakage to an eavesdropper in a pure-loss channel. However, the asymmetry of the protocol with respect to the quadratures of light presents security issues and the eavesdropper's information is not necessarily minimized for general asymmetric attacks. Here, we perform asymptotic security analysis of the asymmetric protocol against general asymmetric collective attacks and bound the eavesdropper's information via the Heisenber…

普及型漏洞分析与防御：基于量子密钥分发的量子私人查询

Pervasive Vulnerability Analysis and Defense for QKD-based Quantum Private Query

本文提出多加密防御方案，针对基于QKD的QPQ协议中存在严重的安全漏洞问题，通过分析隐信息提取和攻击类型，提供理论和技术支持以增强协议的安全性。

Robust quantum data locking from phase modulation

Quantum data locking is a unique quantum phenomenon that allows a relatively short key to (un)lock an arbitrarily long message encoded in a quantum state, in such a way that an eavesdropper who measures the state but does not know the key has essentially no information about the encrypted message. The application of quantum data locking in cryptography would allow one to overcome the limitations of the one-time pad encryption, which requires the key to have the same length as the message. However, it is known that the strength of quantum data locking is also its Achilles heel, as the leakage o…

Families of Quantum Fingerprinting Protocols

We introduce several families of quantum fingerprinting protocols to evaluate the equality function on two $n$-bit strings in the simultaneous message passing model. The original quantum fingerprinting protocol uses a tensor product of a small number of $\mathcal{O}(\log n)$-qubit high dimensional signals [Buhrman et al. 2001], whereas a recently-proposed optical protocol uses a tensor product of $\mathcal{O}(n)$ single-qubit signals, while maintaining the $\mathcal{O}(\log n)$ information leakage of the original protocol [Arrazola and Lütkenhaus 2014]. We find a family of protocols which inte…

快速通量激活的泄漏抑制技术用于超导量子电路

Fast Flux-Activated Leakage Reduction for Superconducting Quantum Circuits

本文提出一种基于参数通量调制的资源高效通用泄漏抑制单元，可在约50纳秒内将超导量子比特泄漏降至测量精度，错误率低至2.5×10⁻³，无需额外硬件，适用于大规模量子纠错电路。

通过连续绝热演化实现量子锁相检测

Quantum Lock-In Detection via Successive Adiabatic Evolution

研究提出通过连续量子绝热演化实现量子锁相检测的通用协议，利用绝热控制量子探针时间演化实现信号调制，解决频谱泄漏问题，给出基于金刚石氮空位中心的实施方案，证明其对实验缺陷有强恢复能力，推动量子传感技术发展。

通过估计密钥泄漏来对抗探测器致盲攻击

Countermeasure against detector-blinding attack with estimation of secret-key leakage

研究针对探测器致盲攻击的对策，利用量子密钥分发会话中积累事件的统计分析，基于先前对连续波DBA无效的工作，扩展评估其对脉冲DBA的性能，发现能增加触发脉冲能量差，重新评估对策可行性并估计对手窃取比特比例。

超快绝热量子门的脉冲整形

Pulse Shaping for Ultra-Fast Adiabatic Quantum Gates

本文提出延迟泄漏抑制（DLR）技术，通过时间延迟重复控制信号抑制基带控制中的泄漏，实现自旋量子比特间超快绝热CZ门，在9.4 ns内保真度超过99.9%。

通过动力学调制增强量子参数估计

Enhanced Quantum Parameter Estimation via Dynamical Modulation

本文提出一种通用动力学调制方案，通过选择系统有效频率并操控稳态概率和衰减率等动力学特性，显著提高量子Fisher信息，从而增强参数估计精度，并在Ramsey光谱学和量子温度计中验证了其有效性。

全被动量子密钥分发的原理验证演示

Proof-of-Principle Demonstration of Fully-Passive Quantum Key Distribution

本研究通过增益开关与后选择技术，在三种信道损耗下实验验证了全被动偏振编码量子密钥分发的可行性，消除了有源调制带来的侧信道风险。

避免 Lambda 系统中由非预期跃迁引起的泄漏和错误

Avoiding leakage and errors caused by unwanted transitions in Lambda systems

本文针对三能级 Lambda 系统中非预期跃迁导致的门保真度下降问题，提出通过静态失谐修改和脉冲校正调制（推广 DRAG 协议）来抑制非预期耦合，实现快速高保真度量子门操作。

通过相关直方图调制实现可调谐多进制量子安全直接通信

Tunable M-Ary Quantum Secure Direct Communication via Correlation-Histogram Modulation

提出基于双向纠缠的量子安全直接通信协议，信息编码为可调参数值，从检测对窗口的联合结果直方图解码，介绍协议级设计参数优势及防非理想效应泄漏的框架。

Preventing side-channel effects in continuous-variable quantum key distribution

The role of the side channels in the continuous-variable quantum key distribution is studied. It is shown how the information leakage through a side channel from the trusted sender station increases the vulnerability of the protocols to the eavesdropping in the main quantum communication channel. Moreover, the untrusted noise infusion by an eavesdropper on the trusted receiving side breaks the security even for a purely attenuating main quantum channel. As a method to compensate for the effect of the side-channel leakage on the sender side, we suggest several types of manipulations on the side…