Figure 11

Monitor readout under pulsed blinding at different duty cycle values of the blinding illumination, at 20 Hz repetition rate of the blinding pulses. 100% is cw blinding, 50% is 25 ms long blinding pulse, 40% is 20 ms long blinding pulse, etc. Dotted horizontal lines indicate an expected countermeasure readout in the normal photon counting mode at 20 kHz click rate and at the dark count rate (as calibrated in Sect. 3.1). Dotted vertical lines indicate the minimum blinding power and minimum cw power at which \(E_{\text{always}}/E_{\text{never}}\leq 2\)