In this paper, we propose a quantum key distribution (QKD) protocol based on only a two-dimensional Hilbert space encoding a quantum system and independent devices between the equipment for state preparation and measurement. Our protocol is inspired by the fully device-independent quantum key distribution (FDI-QKD) protocol and the measurement-device-independent quantum key distribution (MDI-QKD) protocol. Our protocol only requires the state to be prepared in the two dimensional Hilbert space, which weakens the state preparation assumption in the original MDI-QKD protocol. More interestingly, our protocol can overcome the detection loophole problem in the FDI-QKD protocol, which greatly limits the application of FDI-QKD. Hence our protocol can be implemented with practical optical components.
@article{arxiv.1402.2053,
title = {Quantum key distribution based on quantum dimension and independent devices},
author = {Hong-Wei Li and Zhen-Qiang Yin and Wei Chen and Shuang Wang and Guang-Can Guo and Zheng-Fu Han},
journal= {arXiv preprint arXiv:1402.2053},
year = {2015}
}