So sánh phương pháp

	Ước lượng Pha Lượng tử	Thuật toán Tìm Giá trị Riêng Lượng Tử Biến phân
Lĩnh vực	Tính toán lượng tử	Tính toán lượng tử
Họ	Machine learning	Machine learning
Năm ra đời	1995	2014
Người khởi xướng	Alexei Kitaev	Alberto Peruzzo
Loại	Subroutine algorithm	Hybrid quantum-classical algorithm
Công trình gốc	Kitaev, A. Y. (1995). Quantum measurements and the Abelian stabilizer problem. arXiv preprint quant-ph/9511026.	Peruzzo, A., McClean, J., Shadbolt, P., et al. (2014). A variational eigenvalue solver on a photonic quantum processor. Nature Communications, 5, 4213.
Tên gọi khác	QPE, phase kickback	VQE, hybrid quantum-classical
Liên quan	3	4
Tóm tắt	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 Variational Quantum Eigensolver (VQE) is a hybrid quantum-classical algorithm designed to find the lowest eigenvalue (ground state energy) of a quantum Hamiltonian. Introduced by Peruzzo et al. in 2014, it exploits the variational principle to combine the power of quantum circuits with classical optimization to solve chemistry and materials science problems on near-term quantum devices.