he group of Jianwei PAN at the University of Science and Technology of China (USTC) of CAS, have sent secure quantum protocol, known as measurement-device-independent quantum key distribution (MDIQKD), over a distance of 404 km. Compared with earlier experiments, they demonstrated a 500-fold increase in speed, reaching a key-distribution rate that would be sufficient to ensure encrypted voice transmission by telephone.

CAS news release, November 11, 2016