That's usually referred to as 'decoherence' https://en.wikipedia.org/wiki/Quantum_decoherence#In_interpretations_of_quantum_mechanics https://en.wikipedia.org/w

That's usually referred to as 'decoherence' https://en.wikipedia.org/wiki/Quantum_decoherence#In_interpretations_of_quantum_mechanics https://en.wikipedia.org/wiki/Quantum_decoherence#In_interpr... (Observation can also literally freeze the state of a system, via the Quantum Zeno Effect https://en.wikipedia.org/wiki/Quantum_Zeno_effect https://en.wikipedia.org/wiki/Quantum_Zeno_effect but that's based on observing the same system over and over again, not different systems interacting)