Proof-of-principle demonstration of semi-quantum key distribution based on the Mirror protocolSiyu Han, Yutao Huang, Shang Mi, Xiaojuan Qin, Jindong Wang, Yafei Yu, Zhengjun Wei and Zhiming ZhangEPJ Quantum Technol., 8 1 (2021) 28DOI: https://doi.org/10.1140/epjqt/s40507-021-00117-8