A Deterministic Demystification of the Which-Way Quantum Double-Slit Experiment

We present a first-principles, deterministic account of the quantum double-slit experiment with which-way detectors. Detectors are modeled as physical circuits possessing energetic barriers and therefore necessarily introduce localized interaction potentials. These interactions modify the action of electron paths and rotate the relative phase of each path. The continuous transition from interference to its suppression follows solely from unitary propagation. All probabilistic outcomes arise only from the quadratic mapping of the propagated state after propagation.