Quantum Illumination Radar 2D: Signal-Space Discrimination

This 2D-native counterpart to the 3D quantum-illumination flight simulator drops the animated photon scene entirely and shows the actual object the physics is about: the measurement-space diagrams a receiver uses to decide "target present" or "target absent". Two panels plot the quantum and classical receivers' theoretical Gaussian distributions side by side, with a live strip-plot of every trial's real measurement value landing in a present-row or absent-row, colored by whether the decision was correct. A third panel sweeps the exact error-probability formulas across target reflectivity κ on a log scale, making the textbook 4x error-exponent (6 dB) quantum advantage visible as a constant vertical gap between two curves rather than a single readout, exactly reproducing the discrimination statistics of the 3D model through a genuinely 2D, distribution-based representation.