Quantum Superposition: A quantum system can exist in multiple states simultaneously—like an electron spinning both up and down—until measured. This is mathematically described by the wavefunction. Superposition enables quantum computing’s power, where qubits process vast combinations at once. Yet, we never observe superposition directly; it collapses upon measurement. Why don’t macroscopic objects exhibit obvious superposition? Decoherence explains how interaction with the environment rapidly destroys large-scale superpositions. Still, the transition from quantum possibility to classical definiteness is unclear. Superposition challenges our notion of definite reality, suggesting existence is probabilistic until observed, a core mystery of quantum mechanics.
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