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25 January 2025

» arxiv » 2309.00221

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A multinode quantum network over a metropolitan area
Jian-Long Liu ; Xi-Yu Luo ; Yong Yu ; Chao-Yang Wang ; Bin Wang ; Yi Hu ; Jun Li ; Ming-Yang Zheng ; Bo Yao ; Zi Yan ; Da Teng ; Jin-Wei Jiang ; Xiao-Bing Liu ; Xiu-Ping Xie ; Jun Zhang ; Qing-He Mao ; Xiao Jiang ; Qiang Zhang ; Xiao-Hui Bao ; Jian-Wei Pan ;
Date:	1 Sep 2023
Abstract:	Towards realizing the future quantum internet, a pivotal milestone entails the transition from two-node proof-of-principle experiments conducted in laboratories to comprehensive, multi-node setups on large scales. Here, we report on the debut implementation of a multi-node entanglement-based quantum network over a metropolitan area. We equipped three quantum nodes with atomic quantum memories and their telecom interfaces, and combined them into a scalable phase-stabilized architecture through a server node. We demonstrated heralded entanglement generation between two quantum nodes situated 12.5 km apart, and the storage of entanglement exceeding the round-trip communication time. We also showed the concurrent entanglement generation on three links. Our work provides a metropolitan-scale testbed for the evaluation and exploration of multi-node quantum network protocols and starts a new stage of quantum internet research.
Source:	arXiv, 2309.00221
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