论文标题
简单的有效解码器，用于用编码的量子中继器上的量子密钥分布
Simple efficient decoders for quantum key distribution over quantum repeaters with encoding
论文作者
论文摘要
我们研究了量子密钥分布（QKD）系统对量子中继器基础设施的实施。我们特别考虑使用编码的量子中继器，并将其与概率量子中继器进行比较。为此，我们为编码的中继器提供了两个解码器结构，这些解码器不仅可以改善系统性能，而且还通过从QKD解码器中删除两倍的门来使实现方面更容易。通过开发几种可扩展的数值和分析技术，我们然后确定设置对各种误差源，测量模块和设置初始化的弹性。我们将技术应用于三分之三和五分位重复代码，并为编码和概率的量子中继器每秒获得每次记忆的归一化秘密密钥生成率。我们量化了操作制度，其中一类中继器优于另一个类别，发现有可行的操作制度，其中编码的中继器（基于简单的三分之一重复的重复代码）可以提供实用的优势。
We study the implementation of quantum key distribution (QKD) systems over quantum repeater infrastructures. We particularly consider quantum repeaters with encoding and compare them with probabilistic quantum repeaters. To that end, we propose two decoder structures for encoded repeaters that not only improve system performance but also make the implementation aspects easier by removing two-qubit gates from the QKD decoder. By developing several scalable numerical and analytical techniques, we then identify the resilience of the setup to various sources of error in gates, measurement modules, and initialization of the setup. We apply our techniques to three- and five-qubit repetition codes and obtain the normalized secret key generation rate per memory per second for encoded and probabilistic quantum repeaters. We quantify the regimes of operation, where one class of repeater outperforms the other, and find that there are feasible regimes of operation where encoded repeaters -- based on simple three-qubit repetition codes -- could offer practical advantages.
