Composite photo taken on June 15, 2017 shows a quantum communication ground station in Urumqi, capital of northwest China's Xinjiang Uygur Autonomous Region. Chinese scientists on Thursday reported a major breakthrough in quantum communication: A pair of entangled photons over a distance of 1,200 km have been successfully transmitted from space to Earth. The previous record was about 100 km. (Xinhua/Jin Liwang)
