Experimental demonstration of fully passive quantum key distribution
Feng-Yu Lu, Ze-Hao Wang, V\'ictor Zapatero, Jia-Lin Chen, Shuang Wang,, Zhen-Qiang Yin, Marcos Curty, De-Yong He, Rong Wang, Wei Chen, Guan-Jie, Fan-Yuan, Guang-Can Guo, Zheng-Fu Han
TL;DR
This paper demonstrates a fully passive quantum key distribution system that eliminates active modulation, enhancing security by removing side-channel vulnerabilities, and achieves competitive secret key rates.
Contribution
It presents the first fully passive time-bin encoding QKD system with a successful modulator-free implementation, advancing practical secure quantum communication.
Findings
Successful implementation of a fully passive QKD link
Capable of delivering competitive secret key rates
Eliminates active modulation to reduce side-channel risks
Abstract
The passive approach to quantum key distribution (QKD) consists of removing all active modulation from the users' devices, a highly desirable countermeasure to get rid of modulator side-channels. Nevertheless, active modulation has not been completely removed in QKD systems so far, due to both theoretical and practical limitations. In this work, we present a fully passive time-bin encoding QKD system and report on the successful implementation of a modulator-free QKD link. According to the latest theoretical analysis, our prototype is capable of delivering competitive secret key rates in the finite key regime.
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Taxonomy
TopicsQuantum Information and Cryptography · Quantum Computing Algorithms and Architecture · Quantum-Dot Cellular Automata