# Tag Info

1 vote

### How can I understand the notation for the final state of QPE algorithm?

Given a unitary operator $U$ the algorithm estimates $\theta$ in $U|\psi \rangle = e^{2\pi i \theta} |\psi\rangle$. So $\theta$ is an angle that determines a complex eigenvalue $e^{2\pi i \theta}$ ...
• 318
1 vote
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• 950
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### Applying QPE on a large matrix on amazon-braket

This error occurs because there's a mismatch between the dimensions of the unitary matrix and the qubits it's acting on (for example, a 16 x 16 matrix acting on 5 qubits). I'm suspecting there's a bug ...
• 403