Large scale quantum key distribution: challenges and solutions
Qiang Zhang, Feihu Xu, Yu-Ao Chen, Cheng-Zhi Peng, Jian-Wei Pan
TL;DR
This paper reviews the challenges and solutions for scaling quantum key distribution (QKD) to a global level, discussing security, network deployment, and satellite-based approaches.
Contribution
It provides a comprehensive overview of recent experimental efforts and technological solutions for implementing large-scale QKD networks.
Findings
Security of practical QKD with imperfect devices analyzed
Development of metropolitan and backbone optical fiber networks for QKD
Advancements in satellite-based free space QKD
Abstract
Quantum key distribution (QKD) together with one time pad encoding can provide information-theoretical security for communication. Currently, though QKD has been widely deployed in many metropolitan fiber networks, its implementation in a large scale remains experimentally challenging. This letter provides a brief review on the experimental efforts towards the goal of global QKD, including the security of practical QKD with imperfect devices, QKD metropolitan and backbone networks over optical fiber and satellite-based QKD over free space.
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