论文标题
用编码对量子中继器上的量子密钥分布：使用错误检测作为有效的后选择工具
Quantum key distribution over quantum repeaters with encoding: Using Error Detection as an Effective Post-Selection Tool
论文作者
论文摘要
我们根据量子误差检测提出了一种基于量子键分布（QKD）系统的选择后选择技术，该系统通过编码在量子上折扣器上运行。在此类中继器中，量子误差校正技术用于纠缠蒸馏。通过开发一种研究此类量子中继器的分析方法，我们表明，在QKD的背景下，使用误差检测而不是误差校正，基础代码的能力筛选出已检测到错误的情况通常更有效。我们通过对系统的关键组件中的不同错误来源进行建模，以实现三分之二重复代码的技术。然后，我们详细研究了此类缺陷对QKD系统秘密密钥生成率的影响，以及如何使用纠缠交换和解码阶段中获得的信息来最大化速率。出于基准目的，我们在设置的不同组件中指定可以获得正键率的最大允许错误率。
We propose a post-selection technique, based on quantum error detection, for quantum key distribution (QKD) systems that run over quantum repeaters with encoding. In such repeaters, quantum error correction techniques are used for entanglement distillation. By developing an analytical approach to study such quantum repeaters, we show that, in the context of QKD, it is often more efficient to use the error detection, rather than the error correction, capability of the underlying code to sift out cases where an error has been detected. We implement our technique for three-qubit repetition codes by modelling different sources of error in crucial components of the system. We then investigate in detail the impact of such imperfections on the secret key generation rate of the QKD system, and how one can use the information obtained during entanglement swapping and decoding stages to maximize the rate. For benchmarking purposes, we specify the maximum allowed error rates in different components of the setup below which positive key rates can be obtained.
