Causation between states or only between measurements?

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The discussion centers on the concept of causation in quantum mechanics, specifically whether one quantum state can be said to "cause" another without measurement. It concludes that causation is defined by the relationship between measurements rather than the states themselves. The evolution of a quantum state from time t=0 to t=T illustrates that causation is observable only through measurement, reinforcing the measurement-centric view of quantum mechanics.

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nomadreid
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In the use of the word "causation" can one say that one quantum state "causes" another if the two states are not measured? Or does the concept of causation only refer to a relationship between measurements?
 
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A quantum state at time t=0 can evolve into a different state at t=T. In that case the first state clearly "caused" the second state.
 
OK, thanks, mfb
 

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