방법 비교

	양자 위상 추정	양자 근사 최적화 알고리즘
분야	양자컴퓨팅	양자컴퓨팅
계열	Machine learning	Machine learning
기원 연도	1995	2014
창시자	Alexei Kitaev	Edward Farhi
유형	Subroutine algorithm	Hybrid quantum-classical algorithm
원전	Kitaev, A. Y. (1995). Quantum measurements and the Abelian stabilizer problem. arXiv preprint quant-ph/9511026.	Farhi, E., Goldstone, J., Gutmann, S. (2014). A quantum approximate optimization algorithm. arXiv preprint arXiv:1411.4028.
별칭	QPE, phase kickback	QAOA, quantum alternating operator ansatz
관련	3	4
요약	Quantum Phase Estimation (QPE) is a fundamental quantum subroutine that estimates the eigenvalues of a unitary operator. Developed by Alexei Kitaev in 1995, QPE combines controlled unitary evolution with the quantum Fourier transform to extract eigenvalues from quantum states with exponential precision scaling.	The Quantum Approximate Optimization Algorithm (QAOA) is a hybrid quantum-classical algorithm designed to solve combinatorial optimization problems on near-term quantum devices. Introduced by Farhi, Goldstone, and Gutmann in 2014, QAOA encodes optimization problems into quantum circuits and uses classical optimization to tune circuit parameters, aiming to find approximately optimal solutions for problems like MaxCut, graph coloring, and scheduling.