“Satellite-based entanglement distribution over 1200 kilometers” (previous achivement was ~ 100 km) “A successful quantum communication network will rely on the ability to distribute entangled photons over large distances between receiver stations. So far, free-space demonstrations have been limited to line-of-sight links across cities or between mountaintops. Scattering and coherence decay have limited the link separations to around 100 km. Yin et al. used the #Micius satellite, which was launched last year and is equipped with a specialized quantum optical payload. They successfully demonstrated the satellite-based entanglement distribution to receiver stations separated by more than 1200 km.”
▻http://science.sciencemag.org/content/356/6343/1140 (the full paper is not online but of course you can get it on Sci-Hub ▻http://sci-hub.bz/10.1126/science.aan3211 )