@article {27832, title = {An integrated space-to-ground quantum communication network over 4,600 kilometres}, journal = {Nature}, volume = {589}, year = {2021}, pages = {214-219}, publisher = {Nature Publishing Group}, isbn = {1476-4687}, author = {Chen, Yu-Ao and Qiang Zhang and Chen, Teng-Yun and Cai, Wen-Qi and Liao, Sheng-Kai and Jun Zhang and Kai Chen and Yin, Juan and Ren, Ji-Gang and Zhu Chen} }