Improving continuous-variable quantum key distribution under local oscillator intensity attack using entanglement in the middle
Yang Fang-Li1, Guo Ying2, †, Shi Jin-Jing2, Wang Huan-Li3, Pan Jin-Jin1
       

The original structure of LOIA–CVQKD protocol based on Alice, generating EPR state and LO signal by laser. Eve performs LO intensity attenuation attack, which consists of attacking the signal beam with a traditional Gaussian collective attack with unitary operation and attacking LO with intensity attenuation by a non-changing phase attenuator .