Figure 3From: Automated verification of countermeasure against detector-control attack in quantum key distributionMonitor readout M as a function of a constant APD current Ipd. The curve has been theoretically calculated based on the data sheets of the integrated circuits. Note that with \(V_{\text{bias}} = +68.6\text{ V}\) and the resistor values used in this particular detector sample, Ipd cannot exceed about 6.8 mABack to article page