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 secret key rates versus channel loss in terahertz band with the tunable parameters gNLA and gDLA for (a) f = 300 GHz and (b) f = 1 THz. The three dashed lines show the secret key rates as gDLA is increased from 1 to 20 without amplification effect of gNLA. The purple lines signify the secret key rates when gNLA = 0.96 is used on the basis of perfect detector.