Fast single-photon detectors and real-time key distillation enable high secret-key-rate quantum key distribution systems

IF 32.3 1区物理与天体物理 Q1 OPTICS

Nature Photonics Pub Date : 2023-03-09 DOI:10.1038/s41566-023-01168-2

Fadri Grünenfelder, Alberto Boaron, Giovanni V. Resta, Matthieu Perrenoud, Davide Rusca, Claudio Barreiro, Raphaël Houlmann, Rebecka Sax, Lorenzo Stasi, Sylvain El-Khoury, Esther Hänggi, Nico Bosshard, Félix Bussières, Hugo Zbinden

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引用次数: 12

Abstract

Quantum key distribution has emerged as the most viable scheme to guarantee information security in the presence of large-scale quantum computers and, thanks to the continuous progress made in the past 20 years, it is now commercially available. However, the secret key rates remain limited to just over 10 Mbps due to several bottlenecks on the receiver side. Here we present a custom multipixel superconducting nanowire single-photon detector that is designed to guarantee high count rates and precise timing discrimination. Leveraging the performance of the detector and coupling it to fast acquisition and real-time key distillation electronics, we remove two major roadblocks and achieve a considerable increase of the secret key rates with respect to the state of the art. In combination with a simple 2.5-GHz clocked time-bin quantum key distribution system, we can generate secret keys at a rate of 64 Mbps over a distance of 10.0 km and at a rate of 3.0 Mbps over a distance of 102.4 km with real-time key distillation. In combination with a 2.5-GHz clocked time-bin quantum key distribution system, secret keys are generated at a rate of 64 Mbps over a distance of 10.0 km and at a rate of 3.0 Mbps over a distance of 102.4 km with real-time key distillation.

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快速单光子探测器和实时密钥蒸馏实现了高密钥率量子密钥分发系统

量子密钥分发已成为在大规模量子计算机存在的情况下保证信息安全的最可行方案。然而，由于接收端的一些瓶颈，秘钥传输速率仍被限制在 10 Mbps 以上。在这里，我们介绍一种定制的多像素超导纳米线单光子检测器，其设计旨在保证高计数率和精确的时间判别。利用检测器的性能，并将其与快速采集和实时密钥蒸馏电子装置耦合，我们消除了两个主要障碍，实现了密钥速率在现有技术水平上的大幅提升。结合一个简单的 2.5 GHz 时钟分时量子密钥分发系统，我们可以在 10.0 千米的距离内以 64 Mbps 的速率生成密钥，在 102.4 千米的距离内以 3.0 Mbps 的速率生成实时密钥。结合 2.5 GHz 时钟分时量子密钥分发系统，我们可以在 10.0 千米的距离内以 64 Mbps 的速率生成密钥，在 102.4 千米的距离内以 3.0 Mbps 的速率生成密钥并进行实时密钥蒸馏。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nature Photonics 物理-光学

CiteScore

54.20

自引率

1.70%

发文量

158

审稿时长

12 months

期刊介绍： Nature Photonics is a monthly journal dedicated to the scientific study and application of light, known as Photonics. It publishes top-quality, peer-reviewed research across all areas of light generation, manipulation, and detection. The journal encompasses research into the fundamental properties of light and its interactions with matter, as well as the latest developments in optoelectronic devices and emerging photonics applications. Topics covered include lasers, LEDs, imaging, detectors, optoelectronic devices, quantum optics, biophotonics, optical data storage, spectroscopy, fiber optics, solar energy, displays, terahertz technology, nonlinear optics, plasmonics, nanophotonics, and X-rays. In addition to research papers and review articles summarizing scientific findings in optoelectronics, Nature Photonics also features News and Views pieces and research highlights. It uniquely includes articles on the business aspects of the industry, such as technology commercialization and market analysis, offering a comprehensive perspective on the field.