Proposal for space-borne quantum memories for global quantum networking
Proposal for space-borne quantum memories for global quantum networking
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DOI：
10.1038/s41534-021-00460-9
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发表时间：
2021-08-18
影响因子：
7.6
通讯作者：
Krutzik, Markus
中科院分区：
文献类型：
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作者：
Guedogan, Mustafa;Sidhu, Jasminder S.;Krutzik, Markus
全球规模的量子通信链路将构成量子互联网的骨干。然而，光纤的指数损耗阻碍了数百公里以外的任何实际应用。量子中继器和天基系统提供了克服这一限制的解决方案。在这里，我们分析了配备量子存储器 (QM) 的卫星在量子通信中的使用，重点关注全球范围中继器和存储器辅助 (MA-) QKD，其中 QM 通过同步其他概率检测事件来帮助提高密钥速率。我们证明，配备 QM 的卫星的纠缠分布率比基于光纤中继器或没有 QM 的空间系统的现有协议快三个数量级。我们分析了纠缠分布性能如何取决于内存特性，确定评估不同任务性能的基准，并提出光物质接口的各种架构。我们的工作提供了利用近期技术在全球范围内实现无条件安全量子通信的路线图。
Global-scale quantum communication links will form the backbone of the quantum internet. However, exponential loss in optical fibres precludes any realistic application beyond few hundred kilometres. Quantum repeaters and space-based systems offer solutions to overcome this limitation. Here, we analyse the use of quantum memory (QM)-equipped satellites for quantum communication focussing on global range repeaters and memory-assisted (MA-) QKD, where QMs help increase the key rate by synchronising otherwise probabilistic detection events. We demonstrate that satellites equipped with QMs provide three orders of magnitude faster entanglement distribution rates than existing protocols based on fibre-based repeaters or space systems without QMs. We analyse how entanglement distribution performance depends on memory characteristics, determine benchmarks to assess the performance of different tasks and propose various architectures for light-matter interfaces. Our work provides a roadmap to realise unconditionally secure quantum communications over global distances with near-term technologies.