记者17日从中国科学技术大学获悉，该校潘建伟、张强等科研人员与其他单位合作，通过混合集成 分布式反馈激光器与薄膜铌酸锂光子芯片，成功实现电泵浦片上集成高亮度偏振纠缠量子光源，向集成 化量子信息处理迈出重要一步。相关成果16日发表在《物理评论快报》上。 利用中国科学院半导体研究所牛智川研究员团队开发的780纳米波段分布式反馈激光器，结合济南 量子技术研究院的集成化双通道参量下转换薄膜铌酸锂光子芯片，研究团队实现了高效的自发参量下转 换以及片上偏振纠缠态制备，并通过直流或脉冲电信号泵浦，在室温下实现了超高亮度偏振纠缠光子对 产生，亮度达到4.5×1010对/秒/毫瓦，带宽达到73纳米。该亮度较此前基于氮化硅平台的电泵浦纠缠源 提升了6个数量级，带宽提升了1个数量级。 实验结果表明，该纠缠源在多个波长信道下保真度均大于96%，并具备宽带复用能力，器件尺寸仅 为15毫米×20毫米，展现出优异的集成度。该器件适用于波分复用的光纤网络量子密钥分发、基于卫星 的星地量子通信以及基于纠缠的量子精密测量等应用场景。 （原载于《科技日报》 2025-12-18 03版） 纠缠量子光源是量子信息科学的核心资源之一。传统纠缠光子源通 ...

Core Insights - The research team from the University of Science and Technology of China has successfully integrated a high-brightness polarization-entangled quantum light source on an electrically pumped chip, marking a significant step towards integrated quantum information processing [1] Group 1: Quantum Light Source Development - The entangled quantum light source is a core resource in quantum information science, traditionally requiring external laser pumps, which limits integration and scalability [1] - The new electrically pumped scheme allows for direct current injection on-chip, enhancing the integration and scalability of the entangled source [1] - The team achieved a brightness of 4.5×10^10 pairs/second/milliwatt and a bandwidth of 73 nanometers, significantly improving brightness by six orders of magnitude and bandwidth by one order compared to previous silicon-based sources [1] Group 2: Experimental Results and Applications - The entangled source demonstrated a fidelity greater than 96% across multiple wavelength channels and exhibits broadband multiplexing capabilities, with a compact device size of 15mm x 20mm [2] - This device is suitable for applications in wavelength division multiplexing for fiber network quantum key distribution, satellite-based quantum communication, and entanglement-based quantum precision measurement [2]