The double-slit experiment reveals one of quantum physics’ most unsettling ideas: individual particles can produce an interference pattern, yet that pattern changes when which-path information becomes physically available. From wavefunctions and superposition to entanglement, decoherence, and the quantum eraser, the experiment challenges our classical idea of particles following definite paths and shows why reality does not always behave the way our intuition expects.

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TAGS:
double slit experiment, quantum physics, quantum mechanics, particle wave duality, wavefunction, quantum superposition, quantum interference, which path information, quantum measurement, decoherence, entanglement, quantum eraser, particle physics, nature of reality, Richard Feynman