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 a scalable quantum repeater and achieved long-distance high-fidelity entanglement between single atomic nodes, overcoming a major technical challenge that has persisted for nearly 30 years [1] - The entanglement lifetime achieved is 550 milliseconds, which significantly exceeds the time required to establish entanglement (450 milliseconds), enabling effective connection of entanglements and making long-distance quantum networks feasible [1] Group 2: Device-Independent Quantum Key Distribution - The DI-QKD scheme allows for secure key distribution even when quantum devices are completely untrusted, enhancing the practicality and attack resistance of quantum key distribution [2] - The research team has successfully extended the transmission distance of DI-QKD to over 100 kilometers, improving upon the previous best experimental level by more than two orders of magnitude [2] - This achievement is considered a milestone in the field, following the success of the "Mozi" quantum satellite, and signifies a shift from theoretical concepts to practical possibilities in fiber-based quantum networks [2]