Use this topic for questions related to the PennyLane Demo on Intro to Quantum Phase Estimation.
Ok, I understood very clearly, but the question is how to handle the obtained eigenvalue by phase theta…I mean, what is the role of the eigenvalue?
Hi @Tarab_Momin , welcome to the Forum!
The eigenvalue contains the information you need. For example if you’re doing Hamiltonian simulation you may want to find the time evolution of a Hamiltonian (e.g. to understand the dynamics of a new kind of battery material). If you have access to the phase via QPE for example, then this gives you the solution to your problem. We have a Codebook module on QPE, which also mentions why this is useful. Take a look and let me know if this answers your question.
I hope this helps!