BB84 Polarization Phase-Plane & QBER Monitor

This is a 2D-native reading of the same BB84 quantum key distribution physics as the 3D channel view: instead of animating photons flying through space, it puts the protocol's actual state variables — polarization angle and cumulative error rate — directly on two plots. A polar phase-circle resolves each photon's transmitted, (optionally) intercepted, and measured polarization axes as vectors; a scrolling event strip logs every sifted or discarded round by angle; and a live QBER graph tracks the running error rate against the real 11% abort threshold used by deployed quantum key distribution systems, letting you watch the statistic climb toward the theoretical 25% ceiling as an intercept-resend eavesdropper's activity increases.