solve method of the
GroundStateSolver class returns a
Its properties and methods are described below.
energy: [float] – The energy reached by VQE, i.e., the electronic part of energy in the Born-Oppenheimer approximation.
nuclear_repulsion_energy: [float] – The energy of the nucleus in the Born-Oppenheimer approximation.
total_energy: [float] – The total energy of the molecule, i.e., the sum over nuclear_repulsion_energy and energy.
hartree_fock_energy: [float] – The energy in the Hartree-Fock approximation.
ground_state: Dict[str, Complex] – The amplitudes of the computational basis states in the ground state.
The amplitudes are complex only when using state vector simulators; otherwise, they represent the absolute value of the amplitudes.
optimal_parameters: Dict[str, float] – The optimal parameters values reached by VQE.
intermediate_results: List[VQEIntermediateData] – Data stored from the intermediate iterations.
energy_std: [float] – The evaluated standard deviation.
show_convergence_graph() – Displays the energy versus the iteration number graph.