Quantum phase estimation is a technique that estimates the phase of a quantum state by performing a series of controlled operations. It is a fundamental quantum algorithm used in various applications, including state preparation, quantum simulation, and the development of quantum error correction protocols. Quantum phase estimation is based on the quantum Fourier transform, which maps a set of qubit states to a superposition of states with specific phase shifts. By measuring the resulting state, the phase of the original state can be estimated with high precision.
