Investment Rating - The industry investment rating is "Positive" and maintained [7] Core Insights - Recent breakthroughs in scalable quantum networks by researchers from the University of Science and Technology of China have made long-distance quantum networks a realistic possibility. They achieved high-fidelity entanglement between single-atom nodes over long distances and successfully transmitted device-independent quantum key distribution (DI-QKD) over distances exceeding 100 kilometers, advancing the practical application of this technology [2][4][9] - The quantum communication industry in China is currently the largest globally, accounting for 25% of the market share, and is transitioning from demonstration projects to national infrastructure. The country has established the world's first and largest wide-area quantum backbone network, covering over 10,000 kilometers and 80 cities [9][4] - The recent advancements in quantum relay technology and DI-QKD mark a significant milestone for China's quantum communication sector, reinforcing its leading position and paving the way for the construction of a quantum internet [9][4] Summary by Sections Event Description - Researchers have constructed the basic module of a scalable quantum relay, enabling long-distance quantum networks. They achieved a significant milestone by extending the lifetime of quantum entanglement to 550 milliseconds, surpassing the time required to establish entanglement [4][9] Event Commentary - The successful implementation of high-fidelity entanglement over 11 kilometers and maintaining over 90% fidelity at 100 kilometers demonstrates the potential for practical quantum secure communication. This breakthrough is expected to accelerate the commercialization of quantum communication technologies [9][4]

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]