存在缺陷态制备的测量设备无关量子密钥分发实验：传输距离超300公里
Experimental Measurement-Device-Independent Quantum Key distribution with Flawed State-Preparation over 300 km
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中文总结 AI 辅助
本研究针对存在态制备不确定性的问题，开展测量设备无关量子密钥分发实验，基于算子优势法实现严格密钥率估计，在303.37公里距离上完成安全密钥分发，推进了实用安全量子通信的发展。
中文摘要 AI 辅助
量子密钥分发（QKD）可提供理论上安全的通信，但因不可避免的设备缺陷，在实现安全性和性能方面面临挑战。自测量设备无关（MDI）QKD被提出后，实现实用安全QKD的关键步骤是保障存在缺陷光源时的QKD安全。光源缺陷表现为多方面的态制备不确定性（SPU），例如编码不确定性、强度波动和不完善的真空态。本研究开展MDI-QKD实验，同时实现了高实用安全性和优异性能；针对SPU的一般形式，基于算子优势法对安全密钥率进行严格估计，在303.37公里距离上实现了安全密钥分发，这不仅是涉及SPU实验中的最远距离，还考虑了最多的SPU场景，实验结果为推进实用且安全的量子通信迈出了重要一步。
英文摘要
Quantum key distribution (QKD) promises theoretically secure communication. However, it encounters challenges in implementation security and performance due to inevitable device imperfections. Since the proposal of measurement-device-independent (MDI) QKD, the critical step toward practical security is to secure QKD with imperfect sources. The source imperfections manifest as state-preparation uncertainty (SPU) in various aspects, e.g., encoding uncertainty, intensity fluctuation, and imperfect vacuum states. Here, we perform an MDI-QKD experiment and achieve both high practical security and superior performance. We address the general form of SPU and guarantee a tight estimation of the secret key rate based on the operator dominance method. We achieve secure key distribution over 303.37 km, which not only represents the farthest distance in experiments involving SPU but also considers the most SPU scenarios. Our experimental results represent a significant step toward promoting practical and secure quantum communication.
发表机构
- Henan Key Laboratory of Quantum Information and Cryptography, IEU（量子信息与密码学河南省重点实验室，IEU）
- State Key Laboratory of Advanced Optical Communication Systems and Networks, Shanghai Key Lab of Navigation and Location Services, Department of Electronic Engineering, Shanghai Jiao Tong University（先进光通信系统与国家网络国家重点实验室，导航与位置服务上海市重点实验室，电子工程系，上海交通大学）
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