Researchers from Stellenbosch University and the University of Science and Technology of China (USTC) published results in Nature on March 19, 2025, demonstrating quantum key distribution (QKD) over 12,900 km between Beijing and Stellenbosch, South Africa. The experiment used the Jinan-1 quantum microsatellite, launched in July 2022, as a trusted relay to share secure encryption keys and transmit encrypted data between the two ground stations.
The study was led by Pan Jianwei, Peng Chengzhi, and Liao Shengkai of USTC, in collaboration with Stellenbosch University’s Dr. Yaseera Ismail, who led the South African ground station operations. According to a Stellenbosch University press release, the experiment represented the first quantum satellite communication in the southern hemisphere and set a new record for the longest intercontinental quantum satellite link.
A compact ground station weighing approximately 100 kg was deployed on a building at Stellenbosch University. During a six-minute satellite pass in October 2024, the system captured quantum signals and generated up to 1 Mbit of secure keys per pass. The collaboration formed part of quantum cooperation within the BRICS bloc, according to Nature Africa.