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In a multicarrier continuous‐variable quantum key distribution (CVQKD) protocol, the information is granulated into Gaussian subcarrier CVs and the physical Gaussian link is divided into Gaussian sub‐channels. Here, we propose a combined mathematical framework of order statistics and random matrix theory for multicarrier continuous‐variable quantum key distribution. The analysis covers the study of the distribution of the sub‐channel transmittance coefficients in the presence of a Gaussian noise and the utilization of the moment generation function (MGF) in the error analysis. We reveal the mathematical formalism of sub‐channel selection and formulation of the transmittance coefficients and show a reduced complexity progressive sub‐channel scanning method. We define a framework to evaluate the statistical properties of the information flowing processes in multicarrier CVQKD protocols. Using random matrix theory, we express the achievable secret key rates and study the efficiency of the adaptive multicarrier quadrature division‐multiuser quadrature allocation (AMQD‐MQA) multiple‐access multicarrier CVQKD. The proposed combined framework is particularly convenient for the characterization of the physical processes of experimental multicarrier CVQKD. 相似文献
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The diversity space of multicarrier continuous‐variable quantum key distribution (CVQKD) is defined. The diversity space utilizes the resources that are injected into the transmission by the additional degrees of freedom of the multicarrier modulation. We prove that the exploitable extra degree of freedom in a multicarrier CVQKD scenario significantly extends the possibilities of single‐carrier CVQKD. The manifold extraction allows for the parties to reach decreased error probabilities by utilizing those extra resources of a multicarrier transmission that are not available in a single‐carrier CVQKD setting. We define the multidimensional manifold space of multicarrier CVQKD and the optimal tradeoff between the available degrees of freedom of the multicarrier transmission. We extend the manifold extraction for the multiple‐access AMQD‐MQA (multiuser quadrature allocation) multicarrier protocol. The additional resources of multicarrier CVQKD allow the achievement of significant performance improvements that are particularly crucial in an experimental scenario. 相似文献
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朱甫臣 《信息安全与通信保密》2009,(8):258-259
量子通信是否是天然保密的,绝对安全的。有人真的研制出了“量子密码机”,国内外建立的“量子保密通信网络”到底是什么。在这篇文章中,作者依据密码学基本概念和理论,针对量子密码研究方面所出现的这些观点发表几点看法,认为这些观点有违密码学概念和理论。并指出：量子密码虽可能代表密码学的一个崭新方向,但是量子密码的理论和应用技术研究工作,还存在许多技术难题,任重而道远。 相似文献
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Quantum key distribution is a basic implementation technology of quantum communication,which provides a secure key distribution method.With the maturity and development of point-to-point quantum key distribution technology,multi-point to multi-point quantum key distribution networking has become a trend of development in the future.How to construct a multi-point to multi-point quantum key distribution network is currently urgent problem.The architecture of QKD-MON was proposed,the key problems and corresponding strategies in QKD-MON were discussed,the applications of QKD-MON in various scenes were studied,and finally the future development direction and challenges were discussed.The QKD network architecture proposed can efficiently implement QKD between multiple points and provide key resources for the customer flexibly. 相似文献
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量子密钥分发（QKD,quantum key distribution）具有理想的理论安全性,近十年来得到了快速发展.但是,理论上被证明完美的技术并不意味着一定能够实现完美的应用.一方面,越来越多的研究表明,旁路攻击将是QKD系统的一个主要威胁,而且针对实际QKD系统的旁路攻击才刚刚开始.另一方面,由于量子信号的传输不像经典电磁波那样具有很大的灵活性,致使QKD很难与传统通信网络进行无缝对接,也很难在广域网中得到广泛作用.另外,QKD也不能解决身份识别和数据存储安全等问题.因此,构建一个完善的QKD系统安全及其测评体系将是QKD得到实际应用的重要因素,而构建一个完善的抗量子计算的新型密码理论体系将是确保未来信息安全的关键. 相似文献
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最近,国内外量子密码系统实验和应用研究取得了很大进展,但是,对于量子密码的技术特点、量子通信能否突破经典通信的距离和速率极限等却存在一些误解。论文重点对量子密钥分发和量子保密通信体制的技术特色和局限性等进行了分析和评论。 相似文献
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GUO Fen-zhuo~ 《中国邮电高校学报(英文版)》2004,11(Z1)
1 Introduction Conventionallyhowtoachieveasecurekeyisthekeypointofacryptosystem ,andQuantumKeyDis tribution (QKD) providesawaytoachieveuncondi tionallysecurekey .Furthermore ,thesimulationofquantumkeydistributeononclassicalcomputershasbeendiscussedinRef.[1 ].Toguaranteethesecuri tyofthe quantumkeyinpracticalapplications,QuantumKeyAuthentication (QKA)isasimpor tantasQKD .ButtheconventionalQKD protocolssuchasBB84[2 ] ,B92 [3] ,andEPR[4] etc,havenotdonetheidentificationwork .Indeedin… 相似文献
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The assumption that detection and/or state preparation devices used for continuous‐variable quantum key distribution are beyond influence of potential eavesdroppers leads to a significant performance enhancement in terms of achievable key rate and transmission distance. A detailed and comprehensible derivation of the Holevo bound in this so‐called trusted‐device scenario is provided. Modeling an entangling‐cloner attack and using some basic algebraic matrix transformations, it is shown that the computation of the Holevo bound can be reduced to the solution of a quadratic equation. As an advantage of our derivation, the mathematical complexity of our solution does not increase with the number of trusted‐noise sources. Finally, a numerical evaluation of our results is provided, illustrating the counter‐intuitive fact that an appropriate amount of trusted‐receiver loss and noise can even be beneficial for the key rate. 相似文献
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量子纠错编码技术是量子信息实用化的技术基础,电力系统在引进量子技术的同时,需要首先选择适用于电力系统架空线路环境和变电站等高电磁干扰环境下的量子纠错编码方案。文中在介绍量子纠错编码发展历史的基础上,比较4种典型的量子纠错编码方案原理、优缺点、实用性,分析电力系统通信与公共通信网相比所具有的环境特殊性,量子LDPC码被认为是一种适用于电力系统通信的量子纠错编码方案。 相似文献
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信息安全是国家核心竞争力的重要组成部分,量子密钥分发(QKD)利用量子力学基本原理对信息实现计算复杂度无关的安全加密,是下一代信息安全技术的重要选项。经过三十多年的发展,以结合诱骗态的BB84协议为代表的QKD方案已经非常成熟,并逐渐开始了规模化部署。持续探索基础方案和核心技术是推动QKD发展的基础动力。在单回合通信中,基于高维量子态编码的高维QKD(HD-QKD)技术具有更高的信息承载效率和更强的抗噪声能力,因而具有重要的发展和应用潜力,已成为当前QKD领域的重要研究方向之一。光子的轨道角动量(OAM)自由度原则上具有无穷维希尔伯特空间,是实现HD-QKD的重要物理资源。重点回顾了基于OAM光子态的HD-QKD的发展历程,梳理并讨论了该研究方向的主要技术成果和面临的关键技术问题,并展望其未来发展趋势。 相似文献