When Do the Energy Eigenstates Align Again?

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SUMMARY

The discussion centers on determining the time it takes for the wave function \Psi(x,t) to return to its initial state \Psi(x,0) in a quantum mechanical system. The wave function is expressed as a superposition of three energy eigenstates, \psi1, \psi2, and \psi3, each associated with distinct energies E1, E2, and E3. The solution involves analyzing the phase evolution of each eigenstate over time, leading to the conclusion that the states will align again when the differences in their phase contributions result in a common overall phase. This alignment occurs at specific intervals determined by the energy differences.

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Homework Statement





\Psi(x,0) = A[\psi1 + \psi2 + \psi3]

How long will \Psi(x,t) take to go back to \Psi(x,0) ?

E1, E2, E3 are the energies associated with each \psi1, \psi2, \psi3.


Homework Equations



TISE

The Attempt at a Solution



I multiplied \Psi(x,0) by e-iEnt/h. The problem is that, there are three different values of energy associated with each \psi
 
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show your work...

its been a while since I've done this stuff, but i think that E_n should be thought of as an operator, so it will operate on each energy eigenstate to gives its energy in the phase term

the question will then amount to, based on the different energies, at what time, does psi(x,t) differ from psi(x,0) in only an overall phase.

IF you need more, think of the phase as being an arrow on a clock. The energy determines how fast each arrow rotates. So if the 3 arrows start of together all rotating at different speeds, at what time do they all line up again?
 

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