The Quantum Eraser Without Retrocausality: The Mechanical Universe: Lecture 9

Chantal explains the quantum eraser, interference, measurement without any appeal to quantum weirdness. Instead, she shows that these phenomena can be understood as aspects of an elastic aether. Links to simulations: https://jsfiddle.net/u/Chenopdodium/c... https://elastic-universe.org/    / @redpill6313   In this episode, we revisit some of the most puzzling quantum experiments and ask a basic question: Which parts of quantum weirdness come from physics, and which parts come from interpretation? We start by separating two ideas that are often mixed together: what is real in the experiment, and what is merely information. Using simple analogies like socks in boxes, we explore the difference between ontic properties, things that exist whether we look or not, and epistemic descriptions, which only reflect what we know. With that distinction in mind, we return to classic interference experiments, including the double slit, Mach–Zehnder interferometers, and the quantum eraser. We ask: What actually interferes in these experiments? What does “which-way information” really mean? Why does interference disappear when waves become orthogonal? Looking carefully at beam splitters, polarizers, and detectors, we see that many apparent mysteries disappear once light is treated as a continuous wave, and detection events are treated as discrete outcomes of matter responding to that wave. In this view, a “photon” is not a tiny particle traveling through space, but a detector click produced by a probabilistic interaction. The quantum eraser experiment then becomes a test of post-selection, not retrocausality. No pattern on a screen is ever changed after the fact. Instead, correlations are sorted after all detections are complete, based on how data is grouped. The apparent “erasure” happens in data analysis, not in spacetime. This episode sets the stage for the next one by asking a deeper question: If many quantum paradoxes disappear when collapse is treated as epistemic, what happens when we apply the same logic to entanglement?   / inductica   https://x.com/inductica   / inductica   Inductica.org