What the Aspect experiments confirmed — Bell inequality violations prove quantum nonlocality is real

What Bell's theorem proved — no local hidden variable theory can reproduce all predictions of quantum mechanics

Bell's theorem disproved local hidden variable theories' ability to match quantum mechanics' predictions

What the EPR paradox challenged — Einstein argued entanglement implied either hidden variables or nonlocality

EPR paradox questioned quantum mechanics' lack of locality and determinism

What the measurement problem asks — why does a quantum superposition collapse to a definite state upon observation

Quantum measurement problem: Superposition collapses due to observer interaction

What does the Kochen-Specker theorem demonstrate regarding the nature of quantum observables and hidden variables theory?

Kochen-Specker theorem disproves non-contextual hidden variables in quantum mechanics

What quantum entanglement swapping does — entangles particles that have never directly interacted

Quantum entanglement swapping enables non-interacting particles to become entangled through a third-party interaction

What Bose-Einstein condensation demonstrates — macroscopic quantum coherence at ultralow temperatures

Bose-Einstein condensation shows macroscopic quantum coherence at temperatures near absolute zero