Quantum entanglement is important for fields such as quantum computing. But my question is what would happen to the everyday physical world if all particles suddenly became unentangled? Nothing? Complete chaos? No one knows?
Answer
The word entanglement is a short hand for there exists a quantum mechanical wavefunction describing the "entangled particles".
By
if all particles suddenly became unentangled
means that quantum mechanics would no longer work as a model of nature.
Without quantum mechanics there would be no nuclei and atoms and chemistry because all these depend on quantum mechanical bound states which make for the stability of everyday matter.
Of course as John says, to go suddenly from a quantum mechanical world to a classical-only world requires a magical incident, and is not predictable, mainly because of the weak interaction and the strong interaction and the energy trapped in the quarks and gluons which only exist within a quantum mechanical framework. As there would be no weak or strong interaction one would guess that all matter would end up at the stable particles in the particle table., by the magical process that disappeared quantum mechanics.
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