The measurement-device-independent quantum key distribution (MDI-QKD) can be immune to all detector side-channel attacks. Moreover, it can be easily implemented combining with the matured decoy-state methods under current technology. It thus seems a very promising candidate in practical implementation of quantum communications. However, it suffers from severe finite-data-size effect in most existing MDI-QKD protocols, resulting in relatively low key rates. Recently, Jiang et al. [Phys. Rev. A 103, 012402 (2021)] proposed a double-scanning method to drastically increase the key rate of MDI-QKD. Based on Jiang et al.'s theoretical work, here we for the first time implement the double-scanning method into MDI-QKD and carry out corresponding experimental demonstration. With a moderate number of pulses of 10^10, we can achieve 150 km secure transmission distance which is impossible with all former methods. Therefore, our present work paves the way towards practical implementation of MDI-QKD.
@article{arxiv.2105.09587,
title = {Experimental measurement-device-independent quantum key distribution with the double-scanning method},
author = {Yi-Peng Chen and Jing-Yang Liu and Mingshuo Sun and Xing-Xu Zhou and Chun-Hui Zhang and Jian Li and Qin Wang},
journal= {arXiv preprint arXiv:2105.09587},
year = {2021}
}