Reference-frame-independent measurement-device-independent quantum key distribution (RFI-MDI-QKD) is a novel protocol which eliminates all possible attacks on detector side and necessity of reference-frame alignment in source sides. However, its performance may degrade notably due to statistical fluctuations, since more parameters, e.g. yields and error rates for mismatched-basis events, must be accumulated to monitor the security. In this work, we find that the original decoy-states method estimates these yields over pessimistically since it ignores the potential relations between different bases. Through processing parameters of different bases jointly, the performance of RFI-MDI-QKD is greatly improved in terms of secret key rate and achievable distance when statistical fluctuations are considered. Our results pave an avenue towards practical RFI-MDI-QKD.
@article{arxiv.2002.03672,
title = {Efficient decoy-states for the reference-frame-independent measurement-device-independent quantum key distribution},
author = {Feng-Yu Lu and Zhen-Qiang Yin and Guan-Jie Fan-Yuan and Rong Wang and Hang Liu and Shuang Wang and Wei Chen and De-Yong He},
journal= {arXiv preprint arXiv:2002.03672},
year = {2020}
}