Decoy state semi-quantum key distribution Shuang Dong, Shang Mi, Qingcheng Hou, Yutao Huang, Jindong Wang, Yafei Yu, Zhengjun Wei, Zhiming Zhang and Junbin Fang EPJ Quantum Technol., 10 1 (2023) 18 Published online: 31 May 2023 DOI: 10.1140/epjqt/s40507-023-00175-0