What is VQE used for?

Question: What is the Variational Quantum Eigensolver commonly used to estimate? A) The ground-state energy of a quantum system B) The color of a qubit C) The IP address of a quantum computer D) The exact runtime of every classical algorithm Correct: A Explanation: VQE is a hybrid quantum-classical algorithm. A quantum circuit prepares trial states, while a classical optimizer updates circuit parameters to minimize the expected energy of a Hamiltonian. Topic: quantum computing / VQE / hybrid algorithms