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Stepwise $SU(2)$ Rotations on the Bloch Sphere from $\pi$ to $2\pi$

To elaborate the concrete error in my OP, I refer to Fations answer. The key is how he translates the matrix form of a qubit state M_q at the end of his algorithm. ...
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Stepwise $SU(2)$ Rotations on the Bloch Sphere from $\pi$ to $2\pi$

The function rn_su2_euler needs some adjustments. ...
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A fundamental question on multiple rotation of a qubit using $SU(2)$

There is more than one issue in your code. You switched ϕ and θ in the function that convert polar coordinates to cartesian ...
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Visualize representation of a qubit

One certainly can give examples of the form you're asking for. Here's one: $$ \frac{1}{\sqrt{2}}(e^{i\pi/3}|0\rangle+e^{-i\pi/3}|1\rangle). $$ However, note that you will essentially never see an ...
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