We present a simple protocol where Alice and Bob only needs sending out a coherent state or not-sending out a coherent state to Charlie. There is no bases switching. We show that this protocol is both encoding-state-side-channel free to the source part and measurement-device-independent. We don't have to control exactly the whole space state of the light pulse, which is an impossible task in practice. The protocol is immune to all adverse due to encoding-state imperfections in side-channel space such as the photon frequency spectrum, emission time, propagation direction, spatial angular moment, and so on. Numerical simulation shows that our scheme can reach a side-channel-free result for quantum key distribution over a distance longer than 200 km given the single-photon-interference misalignment error rate of 20%.
@article{arxiv.1811.01263,
title = {Encoding-side-channel-free and measurement-device-independent quantum key distribution},
author = {Xiang-Bin Wang and Xiao-Long Hu and Zong-Wen Yu},
journal= {arXiv preprint arXiv:1811.01263},
year = {2020}
}