Semi-quantum private comparison and its generalization to the key agreement, summation, and anonymous ranking

Anonymous and secret communication in quantum networks

Secure communication is one of the key applications of quantum networks. In recent years, following the demands for identity protection in classical communication protocols, the need for anonymity has also emerged for quantum networks. Here, we demonstrate that quantum physics allows parties - besides communicating securely over a network - to also keep their identities secret. We implement such an anonymous quantum conference key agreement by sharing multipartite entangled states in a quantum network. We demonstrate the protocol with four parties and establish keys in subsets of the network -…

匿名量子传感对状态制备误差具有鲁棒性

Anonymous quantum sensing robust against state preparation errors

本文提出一种对状态制备误差具有鲁棒性的匿名量子传感协议，通过结合量子态验证协议提升磁场振幅估计的准确性。

Two-party secure semiquantum summation against the collective-dephasing noise

In this paper, we propose a two-party semiquantum summation protocol, where two classical users can accomplish the summation of their private binary sequences with the assistance of a quantum semi-honest third party (TP). The term 'semi-honest' implies that TP cannot conspire with others but is able to implement all kinds oof attacks. This protocol employs logical qubits as traveling particles to overcome the negative influence of collective-dephasing noise and needn't make any two parties pre-share a random secret key. The security analysis turns out that this protocol can effectively prevent…

设备无关的量子网络匿名通信

Device-Independent Anonymous Communication in Quantum Networks

本文提出首个在现实量子网络中实现匿名通信的完全量子协议，通过设备无关的安全性证明，解决了经典协议和现有量子方法在对抗性环境下的安全问题。

Multi-party quantum summation based on quantum teleportation

We present a secure multi-party quantum summation protocol based on quantum teleportation, in which a malicious, but non-collusive, third party (TP) helps compute the summation. In our protocol, TP is in charge of entanglement distribution and Bell states are shared between participants. Users encode the qubits in their hand according to their private bits and perform Bell-state measurements. After obtaining participants' measurement results, TP can figure out the summation. The participants do not need to send their encoded states to others, and the protocol is therefore congenitally free fro…

对“基于d维贝尔态的无第三方多方量子求和”的改进

Improvements on "Multi-Party Quantum Summation without a Third Party based on $d$-Dimensional Bell States"

针对Wu等人提出的多方量子求和协议存在合谋窃取私有输入的漏洞，本文指出问题并给出改进方案。

Secure multi-party quantum summation based on quantum Fourier transform

In this paper, we propose a novel secure multi-party quantum summation protocol based on quantum Fourier transform, where the traveling particles are transmitted in a tree-type mode. The party who prepares the initial quantum states is assumed to be semi-honest, which means that she may misbehave on her own but will not conspire with anyone. The proposed protocol can resist both the outside attacks and the participant attacks. Especially, one party cannot obtain other parties' private integer strings; and it is secure for the colluding attack performed by at most n-2 parties, where n is the nu…

GHZ关联提供安全的匿名否决协议

GHZ correlation provides secure Anonymous Veto Protocol

匿名否决（AV）和Dining密码学家（DC）是密码学问题的两个基本原语，其主要目的是隐藏消息的发送者的身份。这些可以通过经典方法实现，其中安全性基于计算硬度或共享私钥。在这方面，我们提出了一个安全的量子协议DC和AV利用GHZ相关性。我们首先解决了一个广义版本的DC问题的帮助下，多方GHZ状态。这使我们能够为AV提供安全的量子协议。这两个协议的安全性依赖于与量子非局域性相关的GHZ相关性的一些新的和基本的特征。

Improvements on "Secure multi-party quantum summation based on quantum Fourier transform"

Recently, a quantum multi-party summation protocol based on the quantum Fourier transform has been proposed [Quantum Inf Process 17: 129, 2018]. The protocol claims to be secure against both outside and participant attacks. However, a closer look reveals that the player in charge of generating the required multi-partite entangled states can launch two kinds of attacks to learn about other parties' private integer strings without being caught. In this paper, we present these attacks, and propose countermeasures to make the protocol secure again. The improved protocol not only can resist these a…

量子私有成员聚合

Quantum Private Membership Aggregation

本研究针对N方私有集合成员聚合问题，提出基于纠缠量子态的编解码方案，将经典信息映射为可区分量子态实现私密统计，还可支持模P的N方私密求和，可应用于私密比较、投票等场景。

Hybrid quantum network design against unauthorized secret-key generation, and its memory cost

A significant number of servers that constitute the Internet are to provide private data via private communication channels to mutually anonymous registered users. Such are the servers of banks, hospitals that provide cloud storage and many others. Replacing communication channels by maximally entangled states is a promising idea for the quantum-secured Internet (QI). While it is an important idea for large distances secure communication, for the case of the mentioned class of servers pure entanglement based solution is not only unnecessary but also opens a threat. A crack stimulating a node t…

一种用于就餐密码学家问题的新型可扩展量子协议

A Novel Scalable Quantum Protocol for the Dining Cryptographers Problem

本文提出一种基于最大纠缠 GHZ 态的量子协议，通过可扩展的量子比特数 m 和参与者数 n 解决就餐密码学家问题，支持本地与分布式场景，并采用统一的 Hadamard 和 CNOT 门电路实现模块化部署。

安全高效的双方量子标量积协议及其在隐私保护矩阵乘法中的应用

Secure and Efficient Two-party Quantum Scalar Product Protocol With Application to Privacy-preserving Matrix Multiplication

针对现有量子S2SP协议复杂度近指数的问题，提出基于Fourier纠缠态的S2QSP协议，结合Entanglement Bondage与模求和门实现多项式复杂度和无条件安全，并扩展至隐私保护矩阵乘法。