In the context of the VQE algorithm, explain the significance of the expectation value ( langle psi(theta) | H | psi(theta) rangle ) and how it is computed using a parameterized quantum circuit.
Tuesday, 11 June 2024 by EITCA Academy
The Variational Quantum Eigensolver (VQE) algorithm represents a hybrid quantum-classical approach aimed at finding the ground state energy of a given Hamiltonian . This algorithm leverages the strengths of both quantum and classical computation, making it particularly promising for near-term quantum devices, also known as Noisy Intermediate-Scale Quantum (NISQ) devices. The expectation value plays a