量子信息讲座续讲 第二讲 量子信息安全系统

详细介绍了量子密码的相关内容,包括量子密码理论基础、量子保密系统、量子认证系统、量子密码与其他学科的关系以及量子密码的应用与展望,并追踪了量子信息安全系统的最新研究进展.     

基于FPGA的高速CVQKD系统方案

高速的安全量子密钥传输对于实际应用有很大的意义,本文从提高密钥分发的速率为出发点,提出一种基于FPGA的高速连续变量量子密钥分发的解决方案。从而有望使安全密钥分发的速率在长距离传输下达到Mbps数量级。     

An Eavesdropping Detecting Approach Based on Mode-Mode Correlation

We find that second-order coherence as well as a Hanbury-Brown-Twiss intensity interferometer may provide an optimal approach for eavesdropping detection in the quantum key distribution based on two-mode squeezed vacuum states. With this approach, eavesdropping can be easily detected without sacrificing extra secret bits as the test key. In addition, the efficiency of the quantum key distribution protocol is enhanced greatly.     

高速连续变量量子密钥分发系统同步技术研究

在高速连续变量量子密钥分发系统中,位帧同步技术是确保准确获取量子信号所携带有效信息的核心技术之一。结合平衡零差探测器测量相干态的正则分量数据,提出了一种简单高效的位帧同步理论方案。基于此理论方案,在重复频率为25MHz的高斯调制相干态连续变量量子密钥分发系统上进行了实验测试和性能分析。结果表明,所提出的位帧同步方案能有效克服量子信号在密钥分发中受到的环境因素影响,有效实现通信双方同步。     

超强激光等离子体相互作用中产生的三次谐波

在不作稀薄等离子体和弱相对论近似的情况下,详细研究了超强激光(10~(18)W/cm~2)和等离子体相互作用过程中静电势及三次谐波发射对等离子体参数和激光参数的依赖关系,从而给出了三次相干谐波产生所需的最佳激光参数和等离子体参数.     

Quantum Distributed Ballot Scheme Based on Greenberger-Horne-Zeilinger State

Motivated by the complementary relations of the Greenberger-Horne-Zeilinger （GHZ） entangled tripletparticle states, a novel way of realizing quantum distributed ballot scheme is proposed. The ballot information is encoded by local operations performed on the particles of entangled GHZ triplet states, which ensures the security of the present scheme. In order to guarantee the security of this scheme, the checking phase is designed in detail on the basis of the entangled GHZ triplet state. The analysis shows the security of the proposed scheme.     

Quantum Homodyne Detection Based on Polarization Diversity Technique

A polarization diversity receiver scheme is presented for improving efficiency of balance homodyne detection. The proposed scheme may mitigate polarization fluctuation between signal and local oscillator field. With simple linear optical component and electronic processing circuit, the noise caused by differential phase and polarization mode between signed and local oscillators may be significantly decreased. To track the polarization fluctuation, a novel algorithm based on polarization diversity receiver which can achieve better performance in terms of linear quantum optics principle is proposed.     

Security analysis of continuous-variable quantum key distribution scheme

In this paper security of the quantum key distribution scheme using correlations of continuous variable Einstein--Podolsky--Rosen (EPR) pairs is investigated. A new approach for calculating the secret information rate Δ I is proposed by using the Shannon information theory. Employing an available parameter F which is associated with the entanglement of the EPR pairs, one can detect easily the eavesdropping. Results show that the proposed scheme is secure against individual beam splitter attack strategy with a proper squeeze parameter.     

Deterministic quantum key distribution based on Gaussian-modulated EPR correlations

This paper proposes a deterministic quantum key distribution scheme based on Gaussian-modulated continuous variable EPR correlations. This scheme can implement fast and efficient key distribution. The security is guaranteed by continuous variable EPR entanglement correlations produced by nondegenerate optical parametric amplifier. For general beam splitter eavesdropping strategy, the secret information rate $\Delta I=I(\alpha,\beta)-I(\alpha,\epsilon)$ is calculated in view of Shannon information theory. Finally the security analysis is presented.