Follow how state vectors become amplitudes and Born-rule probabilities, how gates build interference and entanglement, why Bell does not imply faster-than-light messages, and how thermal noise constrains real cryogenic hardware. The brain links lessons, math objects, simulator circuits, protocols, and devices into one navigable map.
This is the first layer of the adaptive path engine: ideas become nodes, explanations become edges, and weak areas can map back to prerequisite lessons, tools, and hardware constraints.