Quantum key distribution without detector vulnerabilities using optically seeded lasers
Quantum key distribution without detector vulnerabilities using optically seeded lasers
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DOI：
10.1038/nphoton.2016.50
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发表时间：
2016-05-01
期刊：
影响因子：
35
通讯作者：
Shields, A. J.
中科院分区：
文献类型：
--
作者：
Comandar, L. C.;Lucamarini, M.;Shields, A. J.
量子密码学 (1,2) 的安全性不断受到针对密码设置真实组件的创造性攻击 (3-7) 的挑战，并通过新的对策 (8-10) 及时恢复以挫败它们。由于其高灵敏度和复杂的设计，探测器是最常受到攻击的组件。最近的研究表明，来自独立光源的双光子干涉 (11) 可用于消除探测器 (12,13) 的任何漏洞。这种新形式的检测安全量子密钥分发 (QKD) 称为独立于测量设备 (13) (MDI)，已通过实验证明 (13-19)，但密钥速率适中。在这里，我们引入了一种新的脉冲激光播种技术，从增益开关激光器获得高可见度干涉，从而在有限尺寸范围内以超过每秒 1 兆比特的前所未有的关键速率执行 MDI-QKD。这比现有实现提高了两到六个数量级，并支持新方案作为安全量子通信的实用资源。
Security in quantum cryptography(1,2) is continuously challenged by inventive attacks(3-7) targeting the real components of a cryptographic set-up, and duly restored by new countermeasures(8-10) to foil them. Owing to their high sensitivity and complex design, detectors are the most frequently attacked components. It was recently shown that two-photon interference(11) from independent light sources can be used to remove any vulnerability from detectors(12,13). This new form of detection-safe quantum key distribution (QKD), termed measurement-device-independent(13) (MDI), has been experimentally demonstrated(13-19) but with modest key rates. Here, we introduce a new pulsed laser seeding technique to obtain high-visibility interference from gain-switched lasers and thereby perform MDI-QKD with unprecedented key rates in excess of 1 megabit per second in the finite-size regime. This represents a two to six orders of magnitude improvement over existing implementations and supports the new scheme as a practical resource for secure quantum communications.