New answers tagged phase-estimation
3
Solving the (classical) problem of finding the eigenvalue corresponding to a given matrix and eigenvector (under the promise that the given vector is indeed an eigenvector) really isn't hard. But I don't know that it's fair to compare that to QPE. For one thing, in QPE you don't need to have a description of the state $|ψ⟩$ for the protocol to work.
Also, ...
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