【科技日报】器件无关量子密钥分发传输距离突破百公里

Core Insights - The research team led by Academician Pan Jianwei from the University of Science and Technology of China has achieved significant breakthroughs in quantum communication technology, specifically in scalable quantum repeaters and device-independent quantum key distribution (DI-QKD) [1][2] Group 1: Quantum Repeater Technology - The team has constructed the basic module for scalable quantum repeaters and achieved long-distance high-fidelity entanglement between single atomic nodes, marking a major advancement in the practical application of this technology [1] - A critical challenge in quantum repeaters has been the short lifespan of entanglement compared to the time required to generate it. The team developed long-lived trapped ion quantum memory and efficient ion-photon communication interfaces, achieving an entanglement lifetime of 550 milliseconds, which exceeds the 450 milliseconds needed for entanglement generation [1] Group 2: Device-Independent Quantum Key Distribution - The DI-QKD scheme allows for secure key distribution even when quantum devices are completely untrusted, significantly enhancing the practicality and attack resistance of quantum key distribution [2] - The research team successfully extended the transmission distance of DI-QKD to over 100 kilometers, improving upon the previous best international experimental level by more than two orders of magnitude [2] - This achievement is considered a milestone for China, following the success of the "Mozi" quantum satellite, and indicates a shift from theoretical concepts to practical possibilities in fiber-based quantum networks [2]