State/wave function after measurement?

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The discussion centers on the behavior of a quantum system's wave function following a measurement. When an observable is measured, the new wave function becomes the eigenfunction corresponding to the measured value. This state does not remain constant; instead, it evolves according to the Schrödinger equation, using the new state as the initial condition. This reflects the fundamental principles of quantum mechanics regarding measurement and state evolution.

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If i already know the wave function then measure an observable what is the new wave function?

Is it just the eigenfunction of the observable corresponding to the measured value?

And does it stay in this state until something interacts with it?
 
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z00maffect said:
If i already know the wave function then measure an observable what is the new wave function? Is it just the eigenfunction of the observable corresponding to the measured value?
Yes, at least according to the simplest measurement model.

z00maffect said:
And does it stay in this state until something interacts with it?
No, it evolves according the the Schrödinger equation with this state as the initial condition.
 
ahh yes of course, much thanks
 

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