A real three-dimensional view of one amplitude
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The plot follows an actual complex amplitude as the relative phase advances. At sample \(n=6\), the phase-family amplitude is
\[
\chi_\theta(6)=\frac{e^{i\theta}}{\sqrt3}.
\]
Its magnitude is constant, so the sample-six probability stays \(1/3\) throughout. Nevertheless, interference changes the probability of the selected subspace according to the preceding page. The geometry separates phase change from magnitude change.