发表机构
Universidad Politécnica de Madrid; Universidad Autónoma de Madrid（马德里理工大学; 马德里自治大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究开发分析模型，揭示量子中继链中中继器数量增加与退相干影响间的权衡，发现存在最优中继器数量，为未来量子网络设计提供指导。
AI 中文摘要
第一代量子中继器对于长距离分发纠缠至关重要，因为它们可以减轻光纤中的损耗。中继器将总距离分割成更短、更容易生成的链路。然后，纠缠交换通过在中继器处执行局部测量并宣告其结果来建立长距离纠缠。在这项工作中，我们开发了一个分析模型，用于估计给定协议在宣告期间退相干的影响。此外，我们识别出两种现象之间的竞争：随着中继器数量的增加，纠缠生成也随之增加，但存储器退相干对最终纠缠率的附加影响也在增加。因此，我们发现存在一个最优的中继器数量。这些发现可以指导未来量子网络的设计，无论是在中继器间距离还是交换时序方面。
英文摘要
First-generation quantum repeaters are essential in distributing entanglement over long distances since they could mitigate losses in optical fiber. Repeaters split the total distance into shorter, easier to generate links. Then, entanglement swapping establishes long range entanglement by performing local measurements at the repeaters and heralding their results. In this work, we develop an analytical model that estimates the impact of decoherence during heralding for a given protocol. Furthermore, we identify a competition between two phenomena: as repeater count increases, so does entanglement generation, but the additive impact of memory decoherence on final entanglement rate increases too. Therefore, we find that an optimal number of repeaters exists. These findings could lead the design of future quantum networks, both in the inter-repeater distance and swapping timings.
Comments5 pages, 2 figures, Submitted to IEEE for possible publication
