833km! China's optical fiber quantum key distribution distance sets a world record/中国光纤量子密钥分发打破世界纪录

Recently, Professor Han Zhengfu and his collaborators from the team of Academician Guo Guangcan of the University of Science and Technology of China recently realized the distribution of quantum keys over an 833-kilometer optical fiber, increasing the world record for secure transmission distance by more than 200 kilometers and striding toward the realization of 1,000-kilometer land-based quantum secure communication. important step. The result was published online in Nature Photonics on January 17, 2022. Quantum key distribution is based on the basic principles of quantum physics, and provides an eavesdropping-perceived key distribution method at the level of information security. Light quantum is the natural carrier of quantum information, but the inevitable loss in the circuit limits the safe distance of quantum key distribution, and is also one of the key factors restricting the deployment and application of wide-area quantum secure communication networks.

DOI: 10.1038/s41566-021-00928-2