Passive decoy-state quantum key distribution using weak coherent pulses with modulator attenuation*
Li Yuana),b), Bao Wan-Sua),b), Li Hong-Weib), Zhou Chuna),b), Wang Yanga),b)
       
The relationship between key generation rate ( R ) and the transmission distance ( d ) of passive decoy-state method under the analysis of imaginary unitary transformation and virtual source.