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We present a simple classical (random) signal model reproducing Born's rule.The crucial point of our approach is that the presence of detector's thresholdand calibration procedure have to be treated not as simply experimentaltechnicalities, but as the basic counterparts of the theoretical model. We callthis approach threshold signal detection model (TSD). The experiment oncoincidence detection which was done by Grangier in 1986 \cite{Grangier} playeda crucial role in rejection of (semi-)classical field models in favor ofquantum mechanics (QM): impossibility to resolve the wave-particle duality infavor of a purely wave model. QM predicts that the relative probability ofcoincidence detection, the coefficient $g^{(2)}(0),$ is zero (for one photonstates), but in (semi-)classical models $g^{(2)}(0)\geq 1.$ In TSD thecoefficient $g^{(2)}(0)$ decreases as $1/{\cal E}_d^2,$ where ${\cal E}_d>0$ isthe detection threshold. Hence, by increasing this threshold an experimentercan make the coefficient $g^{(2)}(0)$ essentially less than 1. TheTSD-prediction can be tested experimentally in new Grangier type experimentspresenting a detailed monitoring of dependence of the coefficient $g^{(2)}(0)$on the detection threshold.

Classical signal model reproducing quantum probabilities for single and coincidence detections