Quantum Decoherence: This explains how quantum superpositions are lost when a system interacts with its environment, leading to classical behavior. Information leaks into countless environmental degrees of freedom, making interference undetectable. Decoherence bridges quantum and classical realms without wavefunction collapse. However, it doesn’t solve the measurement problem—it describes how superpositions become effectively classical, not why one outcome is perceived. The global wavefunction still evolves unitarily. Decoherence is crucial for quantum computing (requiring isolation) and understanding the quantum-to-classical transition. While a powerful mechanism, it shifts the mystery rather than resolving the core question of definite outcomes in our experience, leaving philosophical questions open.
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