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arXiv · 1703.01021

Experimental measurement-device-independent quantum digital signatures over a metropolitan network

Hua-Lei Yin·Wei-Long Wang·Yan-Lin Tang·Qi Zhao·Hui Liu·Xiang-Xiang Sun·Wei-Jun Zhang·Hao Li·Ittoop Vergheese Puthoor·Li-Xing You·Erika Andersson·Zhen Wang·Yang Liu·Xiao Jiang·Xiongfeng Ma·Qiang Zhang·Marcos Curty·Teng-Yun Chen·Jian-Wei Pan
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Abstract

Quantum digital signatures (QDS) provide a means for signing electronic communications with informationtheoretic security. However, all previous demonstrations of quantum digital signatures assume trusted measurement devices. This renders them vulnerable against detector side-channel attacks, just like quantum key distribution. Here, we exploit a measurement-device-independent (MDI) quantum network, over a 200-square-kilometer metropolitan area, to perform a field test of a three-party measurement-device-independent quantum digital signature (MDI-QDS) scheme that is secure against any detector side-channel attack. In so doing, we are able to successfully sign a binary message with a security level of about 1E-7. Remarkably, our work demonstrates the feasibility of MDI-QDS for practical applications.

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Hua-Lei Yin, Wei-Long Wang, Yan-Lin Tang, Qi Zhao, Hui Liu, Xiang-Xiang Sun, Wei-Jun Zhang, Hao Li, Ittoop Vergheese Puthoor, Li-Xing You, Erika Andersson, Zhen Wang, Yang Liu, Xiao Jiang, Xiongfeng Ma, Qiang Zhang, Marcos Curty, Teng-Yun Chen, Jian-Wei Pan. 2017-03-03. Experimental measurement-device-independent quantum digital signatures over a metropolitan network. https://doi.org/10.1103/physreva.95.042338

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