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.
@article{arxiv.1703.01021,
title = {Experimental measurement-device-independent quantum digital signatures over a metropolitan network},
author = {Hua-Lei Yin and Wei-Long Wang and Yan-Lin Tang and Qi Zhao and Hui Liu and Xiang-Xiang Sun and Wei-Jun Zhang and Hao Li and Ittoop Vergheese Puthoor and Li-Xing You and Erika Andersson and Zhen Wang and Yang Liu and Xiao Jiang and Xiongfeng Ma and Qiang Zhang and Marcos Curty and Teng-Yun Chen and Jian-Wei Pan},
journal= {arXiv preprint arXiv:1703.01021},
year = {2017}
}
Comments
5 pages, 1 figure, 2 tables, supplemental materials included as ancillary file