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Documents 量子安全直接通信及QTDMC技术研究
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  • Author Author: sophie0love
  • Date Created: 15 Nov 2010 8:02 AM Date Created
  • Last Updated Last Updated: 9 Nov 2021 4:47 PM
  • Views 265 views
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量子安全直接通信及QTDMC技术研究

量子信息学是量子力学和信息科学相结合的一门新兴学科,它为信息科学的发展开创了新途径。量子通信是量子信息学的一个重要分支,是有望最早进入应用领域的量子信息技术,近年来在理论和实践上已经取得了重要突破。本文围绕量子通信方案和量子多用户通信展开研究。 首先,论述了量子通信的基本形式,介绍了量子通信的理论基础。 其次,在对标准量子隐形传态方案和概率量子隐形传态方案探讨的基础上,提出了一种基于POVM的概率量子隐形传态方案,该方案的成功概率和已证明的最佳概率一致,并给出了最佳POVM算子。之后,估计了EPR对通过一种特殊量子噪声信道后的状态,对估计性能和在该量子信道下量子隐形传态的保真度做了仿真和分析。研究结果表明,随着样本数的增大,估计量的均方误差趋于0,传输态的保真度趋于1。 第三,对Ping-Pong协议的安全性进行了研究,用Holevo定理分析了泄露的最大信息量,并进行了仿真和分析。在此基础上,提出了一种基于EPR对和单光子的量子安全直接通信协议,分析结果证明该协议是安全的。本协议克服了Ping-Pong协议编码容量小、渐进安全的缺陷,提高了安全信道的利用率。 第四,对量子多用户通信进行了深入研究。在给出量子分发信道时分复用方案和量子交换机方案的基础上,提出了量子时分多用户通信方案及通信协议。对误比特率分析的结果表明,量子噪声是引起比特错误的主要因素。 最后,对全文进行了总结,并展望了下一步的工作。

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