Hybrid linear amplifier-involved detection for continuous variable quantum key distribution with thermal states
He Yu-Qian1, Mao Yun1, †, Zhong Hai1, Huang Duang2, Guo Ying1
       

The ΔSNR as functions of gNLA and gDLA. The blank area indicates unphysical region of gNLA > gDLA. The two white dashed lines represent ΔSNR when gNLA changes from 1 to 2. The white solid line represents contour line of ge = gNLA gDLA. Modulation variance VM = 1, shot noise VS = 1.2, transmission efficiency η = 0.6 and detector electronics vel = 0.05.