Quantum Superposition A fundamental principle of the subatomic world. Quantum superposition dictates that a physical system, like an electron, exists in a combination of all theoretically possible states simultaneously. It is only the act of measurement or observation that forces the system to collapse into a single, definite reality. This bizarre phenomenon is famously illustrated by Schrödinger’s Cat, a thought experiment demonstrating a hypothetical cat existing as both simultaneously alive and dead until the box is opened.

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