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Conference on Lasers and Electro-Optics

Solving the Untrusted Source Problem in Measurement-Device-Independent Quantum Key Distribution

Yucheng Qiao, Gan Wang, Zhengyu Li, Bingjie Xu, Bin Luo, Hong Mei Guo

Published May 5, 2019• 0 citations
Publisher

Abstract

We propose a light source monitoring scheme to solve the untrusted source problem in measurement-device-independent quantum key distribution, and show it performs almost the same as the initial protocol with a trusted source. © 2019 The Author(s)
DOI
10.23919/cleo.2019.8749672

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Measurement-device-independent quantum key distribution (MDI-QKD) can provide enhanced security compared to traditional QKD, and it constitutes an important framework for a quantum network with an untrusted network server. Still, a key assumption in MDI-QKD is that the sources are trusted. We propose here a MDI quantum network with a single untrusted source. We have derived a complete proof of the unconditional security of MDI-QKD with an untrusted source. Using simulations, we have considered various real-life imperfections in its implementation, and the simulation results show that MDI-QKD with an untrusted source provides a key generation rate that is close to the rate of initial MDI-QKD in the asymptotic setting. Our work proves the feasibility of the realization of a quantum network. The network users need only low-cost modulation devices, and they can share both an expensive detector and a complicated laser provided by an untrusted network server.