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I don't understand quantum physics (2018)

What HN thinks

A thread titled 'I don't understand quantum physics' where everyone agrees, then argues about exactly which part nobody understands.

Interpretation wars over many-worlds
Commenters fought over whether many-worlds is just bare quantum mechanics without collapse or an unfalsifiable story, with the preferred basis problem, the Born rule and decoherence cited on both sides.
'Understand' means different things
Many said we understand QM well enough to calculate and build devices, but not in the intuitive, metaphor-backed sense Feynman meant.
Hidden variables and superdeterminism
Bell's theorem rules out local hidden variables unless you accept loopholes like superdeterminism or retrocausality, which most found weirder than the problem itself.

Consensus: Most agree QM works superbly for predictions but its interpretation remains unresolved and unintuitive, and that entanglement can't send information faster than light.

Recommended in the comments

Picturing Quantum Processes ↗ (book): Its visual approach helped a commenter grasp the concepts.
Quantum Field Theory for the Gifted Amateur ↗ (book): Well regarded for self-study, though it needs undergraduate background.
Quantum Mechanics for Engineers ↗ (book): Pragmatic 'shut up and calculate' approach.
Basic Concepts of Quantum Mechanics ↗ (book): Its interludes with a skeptical classical physicist are enlightening.
QED: The Strange Theory of Light and Matter (book): A commenter loved it as a child and it shaped their path-integral intuition.
Atomic Physics for Everyone (book): Suggested as a no-prerequisite entry point.