= Bell test
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A <Bell test> compares experimental <probabilities> or <expectation values> with a <Bell inequality>. In a two-setting <photon polarization> test, each station chooses a <polarizer> orientation and records an outcome. A <coincidence circuit> identifies candidate pairs using an agreed timing rule. The choice of which trials enter the statistic is part of the experiment: correlations calculated only from detected pairs can differ from correlations of all emitted pairs. The <Polarization CHSH count model> separates ideal <expectation values> from this experimental selection problem.
\Image[/bell-test-analyzers-and-settings.png]
{title=Two-setting polarization measurements and coincidence readout}
{description=Conceptual apparatus for the ideal two-output model. The displayed angles belong to the worked CHSH example; they are not a reconstruction of a historical apparatus. Each station chooses one basis, then records either output. The coincidence record also needs a rule for missed detections.}
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