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Quantum decoherence is the *irreversible loss of ordering of the phase angles* between the components of a system in a quantum superposition resulting in classical or probabilistically additive behavior, thereby suppressing interference of wavefunction components.

Quantum decoherence is the irreversible loss of ordering of the phase angles between the components of a system in a quantum superposition, resulting in classical or probabilistically additive behavior, thereby suppressing interference of wavefunction components. Decoherence can be viewed as loss of information from a system into the environment, to simulate/explain ''apparent wave function collapse", the quantum features of the system leaking into the environment. That is, components of the wavefunction are decoupled from a coherent system, and acquire phases from their immediate surroundings.