Under FPT_EMS.1/Quantum, checks that emitted pulses follow the photon-number distribution the protocol assumes, indirectly through zero-delay correlation functions g(k). The transmitter emits representative pulses with time-tagged intensity data available; the light goes through a one-to-S splitter to S single-photon detectors feeding coincidence timing electronics (a generalized Hanbury-Brown-Twiss arrangement). With gates aligned, the evaluator counts pulses, single clicks and k-fold coincidences for long enough, computes each detector's single-count probability and the coincidence probabilities, derives measured g(k) up to order S (usually k up to 4 suffices), and compares each with the theoretical value. Each deviation must stay under its threshold T_diffCor(k), per intensity where several are used (the developer may set one or several thresholds), with near-vacuum states exempt; a photon-number-resolving method may replace it under clause 12.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.