Figure 4
From: Feasible attack on detector-device-independent quantum key distribution
Electrical signal oscillograms when the APDs in SPDs Co62 and C061 are controlled by the trigger pulse peak power with a corresponding biased voltage. (a) The values P = 1.96 mW and V bias = 63.38 V cause a detection event in detector C061, however, never cause it in detector C062. (b) In contrast, the values P = 2.7 mW and V bias = 59.38 V cause a detection event in detector C062, however, never cause it in detector C061.
