What is VQE?

Question: What is the Variational Quantum Eigensolver, or VQE? A) A purely classical sorting algorithm B) A method for copying unknown qubits C) A hybrid quantum-classical algorithm often used to estimate ground-state energies D) A hardware cable layout Correct: C Explanation: VQE uses a parameterized quantum circuit to prepare trial states and a classical optimizer to update parameters. It is commonly used for estimating low-energy states of quantum systems. Topic: quantum computing / VQE / hybrid algorithms