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## Homework Statement

A quantum system with a ##C^3## state space and a orthonormal base ##\{|1\rangle, |2\rangle, |3\rangle\}## over which the Hamiltonian operator acts as follows:

##H|1\rangle = E_0|1\rangle+A|3\rangle##

##H|2\rangle = E_1|2\rangle##

##H|3\rangle = E_0|3\rangle+A|1\rangle##

Build H and obtain the eigenvalues and the eigenvectors.

If ##|\Phi((0)\rangle = |2\rangle## obtain ##|\Phi(t)\rangle##.

If ##|\Phi((0)\rangle = |3\rangle## obtain ##|\Phi(t)\rangle##.

## Homework Equations

## The Attempt at a Solution

I've managed to build the H matrix and obtain the eigenvectors.

The second part is ##|\Phi(t)\rangle = e^{-\frac{i}{\hbar}E_1t}|2\rangle##

It is the third part that I'm not sure. Should I build the change of basis matrix from the eigenvectors and apply it to the vector ##|3\rangle## expressed as ## |0 0 1\rangle##, so that I get its eigenvectors descomposition?