论文标题
E91协议中的最佳光子预算分配
Optimal photon budget allocation in E91 protocol
论文作者
论文摘要
为了在全球范围内部署量子通信技术，有必要满足各种规模机构的数据交换需求，并且重要的是要使它们具有成本效益和可行性。为了满足这些要求，已经付出了很多努力来提高关键速度并具有优化的系统。在这项研究中，我们关注的是标准化E91 QKD系统中原始关键率的提高，而不会损害其安全性。我们的方法是在系统中用于不同目的或不可避免地发生的系统中使用的三种类型的位置之间优化光子预算分配。这三种类型的位是关键位，贝尔的不平等位和丢弃的位，其比率分别为25 \％$，$ 50 \％$和$ 25 \％$，在原理实验实验中。另一方面，我们提出了$ 226.22 \％$的原始密钥利率增加，$ 83 \％$，$ 10 \％$和$ 7 \％$ $ $ $ $ $ \％$ $ $ $ $ $ \％$ $在三种类型的位中的光子预算分配。这些比率是通过在一个通信侧用$ 90：10 $ beam拆分器代替$ 50：50 $ beam拆分器，另一个交流侧的$ 93：7 $ beam splitter实现了这些比率。此外，我们证明了最佳光束拆分比可以根据光子预算而有所不同。
In order for the deployment of quantum communication technologies in a global scale, it is necessary to meet data exchange demand of various size establishments per certain time intervals and it is important to make them cost effective and feasible. In order to meet these requirements, a lot of effort has been put into increasing key rate and having optimized systems. In this study, we focus on the improvement of raw key rate in a standardized E91 QKD system without compromising its security. Our method is to optimize photon budget allocation among three types of bits used in the system for different purposes or occurred unavoidably. These three types of bits are key bits, Bell's inequality bits and discarded bits and their ratios were $25\%$, $50\%$ and $25\%$, respectively, in the proof-of-principle experiment. On the other hand, we present $226.22\%$ increase in raw key rate with $83\%$, $10\%$ and $7\%$ allocation of photon budget among three types of bits. These ratios are achieved by replacing $50:50$ beam splitters with a $90:10$ beam splitter at one communicating side and a $93:7$ beam splitter at the other communicating side. Additionally, we demonstrate that the optimum beam splitting ratios can vary depending on photon budget.
