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]

不过，DI-QKD的实验实现面临极为严苛的技术门槛，此前相关实验演示大多局限于数米至数百米 短距离范围。 基于可扩展量子中继技术，研究团队进一步实现了两个铷原子间的远距离高保真纠缠，并在此基础 上将设备无关量子密钥分发的距离突破百公里，较国际此前最好实验水平提升两个数量级以上。 潘建伟表示，上述突破是我国继"墨子号"量子卫星之后又一里程碑式成果，标志着基于量子纠缠的 光纤量子网络正在从理论构想走向现实可能，进一步扩大了我国在该领域的国际领先优势。 （原载于《科技日报》2026-02-09 01版） 记者8日从中国科学技术大学获悉，该校潘建伟院士团队与其他团队合作，在国际上首次构建出可 扩展量子中继的基本模块，并实现了单原子节点间的远距离高保真纠缠，在此基础上首次将器件无关量 子密钥分发（DI-QKD）的传输距离突破百公里，极大推进了该技术的实用化进程。两项成果分别于北 京时间2月3日和6日发表于国际学术期刊《自然》和《科学》。 光纤的固有损耗导致量子纠缠的传输效率随距离成指数衰减，量子中继方案是解决光纤传输损耗的 有效方案。然而，近30年来始终未能解决的一项重大技术难题是：纠缠的寿命远远短于产生纠缠所需的 时 ...