decoherence

Entangled particle wavefunctions depend on each other, maintain phase relations, and have coherence. In isolated systems with entangled particle wavefunctions, system wavefunction continues to evolve deterministically. In non-isolated systems with entangled particle wavefunctions, measurements, absorptions, collisions, electromagnetic forces, and gravitational forces disturb particles and cause entangled superposed particle states to become independent {decoherence}|. System wavefunctions become non-coherent, and particle waves no longer interfere with each other {decoherent histories}, though observers only know this afterwards. System-state phase-space vector reduces to zero. Each particle is independent and has one position and one momentum.

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