PBS Explains the Quantum Eraser and Delayed-Choice Experiments
PBS Space Time · Explainer · YouTube title: How the Quantum Eraser Rewrites the Past | Space Time | PBS Digital Studios
Why it's here
HN recommends it as a quick introduction to the quantum eraser and delayed choice weirdness, though one commenter notes later corrections to its framing.
What it covers
PBS Space Time explains the quantum eraser experiment, in which erasing which-path information appears to reverse causality in a double-slit setup. It discusses what this means for quantum mechanics.