%0 Journal Article %J Nature %D 2021 %T An integrated space-to-ground quantum communication network over 4,600 kilometres %A Chen, Yu-Ao %A Qiang Zhang %A Chen, Teng-Yun %A Cai, Wen-Qi %A Liao, Sheng-Kai %A Jun Zhang %A Kai Chen %A Yin, Juan %A Ren, Ji-Gang %A Zhu Chen %B Nature %I Nature Publishing Group %V 589 %P 214-219 %@ 1476-4687 %G eng %N 7841