论文标题
优化量子互联网的中继器计划
Optimising repeater schemes for the quantum internet
论文作者
论文摘要
通道损失从根本上阻碍了使用直接传输执行量子通信任务的速率。原则上,量子中继器允许克服这些局限性,但是它们的引入必然为纠缠的分布增加了一层复杂性。这种额外的复杂性 - 以及诸如纠缠产生,铃铛掉期和纠缠蒸馏等过程的随机性,使得发现良好的量子中继器方案非平凡。我们开发了一种算法,该算法可以在量子中继器平台的量子中继器方案中有效地执行启发式优化。与基于BDCZ中继器方案的更简单的中继器计划的优化相比,我们发现发电率有很大的提高。我们使用该算法来研究其分布纠缠能力的三个不同的实验量子中继器实现,我们将其列为\ emph {信息处理}实现,\ emph {多路复用}实现以及两者的组合。我们针对各种参数和不同的实验设置对中继器方案进行了启发式优化。这使我们能够估算哪些最关键的参数可以改善纠缠生成,使用多少中继器以及哪些实现在产生纠缠的能力方面发挥最佳性能。
The rate at which quantum communication tasks can be performed using direct transmission is fundamentally hindered by the channel loss. Quantum repeaters allow, in principle, to overcome these limitations, but their introduction necessarily adds an additional layer of complexity to the distribution of entanglement. This additional complexity - along with the stochastic nature of processes such as entanglement generation, Bell swaps, and entanglement distillation - makes finding good quantum repeater schemes non-trivial. We develop an algorithm that can efficiently perform a heuristic optimisation over a subset of quantum repeater schemes for general repeater platforms. We find a strong improvement in the generation rate in comparison to an optimisation over a simpler class of repeater schemes based on BDCZ repeater schemes. We use the algorithm to study three different experimental quantum repeater implementations on their ability to distribute entanglement, which we dub \emph{information processing} implementations, \emph{multiplexed} implementations, and combinations of the two. We perform this heuristic optimisation of repeater schemes for each of these implementations for a wide range of parameters and different experimental settings. This allows us to make estimates on what are the most critical parameters to improve for entanglement generation, how many repeaters to use, and which implementations perform best in their ability to generate entanglement.