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arXiv 2303.01611quant-ph
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具有有限码长安全性的高速率连续变量测量设备无关量子密钥分发

High-rate continuous-variable measurement device-independent quantum key distribution with finite-size security

Adnan A. E. Hajomer, Ulrik L Andersen, Tobias Gehring

AI总结:

本研究首次在有限码长体制下实验验证了CV MDI-QKD系统,通过新型中继结构和锁相系统等设计,在10 km光纤上实现2.6 Mbit/s安全密钥率,为可扩展量子网络铺平道路。

摘要:

构建可扩展且安全的量子网络需要支持多用户连接的先进量子密钥分发(QKD)协议。连续变量(CV)测量设备无关(MDI)QKD消除了所有探测器侧信道攻击,是利用标准技术创建各种量子网络拓扑(如量子接入网络和星型拓扑)并提供高安全密钥率的有力候选方案。然而,其安全性此前仅在具有有限密钥率和复杂实验装置的渐近体制中得到实验验证,限制了其实际应用。在此,我们报告了CV MDI-QKD系统的首次实验验证,在有限码长体制下,通过10 km光纤链路抵御集体攻击实现了2.6 Mbit/s的安全密钥率。这通过一种新系统设计实现,包含本地生成的本振、新型中继结构、实时锁相系统,以及精心设计的用于在20 MBaud符号率下进行量子态制备和CV贝尔测量的数字信号处理流程。我们的结果为安全密钥交换设定了新基准,开启了建立高性能CV MDI-QKD网络的可能性,为可扩展量子网络铺平了道路。

英文摘要:

Building scalable and secure quantum networks requires advanced quantum key distribution (QKD) protocols that support multi-user connectivity. Continuous-variable (CV) measurement-device-independent (MDI) QKD, which eliminates all detector side-channel attacks, is a promising candidate for creating various quantum network topologies-such as quantum access networks and star-type topologies-using standard technology and providing high secure key rates. However, its security has so far only been experimentally demonstrated in asymptotic regimes with limited secret key rates and complex experimental setups, limiting its practical applications. Here, we report the first experimental validation of a CV MDI-QKD system, achieving a secure key rate of 2.6 Mbit/s against collective attacks in the finite-size regime over a 10 km fiber link. This is achieved using a new system design, incorporating a locally generated local oscillator, a new relay structure, a real-time phase locking system, and a well-designed digital-signal-processing pipeline for quantum state preparation and CV Bell measurements at a symbol rate of 20 MBaud. Our results set a new benchmark for secure key exchange and open the possibility of establishing high-performance CV MDI-QKD networks, paving the way toward a scalable quantum network.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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