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quantum phase estimation algorithm : ウィキペディア英語版 | quantum phase estimation algorithm
In quantum computing, the quantum phase estimation algorithm is a quantum algorithm that finds many applications as a subroutine in other algorithms. The quantum phase estimation algorithm allows one to estimate the eigenphase of an eigenvector of a unitary gate, given access to a quantum state proportional to the eigenvector and a procedure to implement the unitary conditionally. ==The Problem== Let ''U'' be a unitary operator that operates on ''m'' qubits. Then all of the eigenvalues of ''U'' have absolute value 1. Thus the spectrum of a unitary operator consists of phases . Given an eigenvector , such that , the objective is to estimate . The phase estimation algorithm solves this problem.
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