GroundStateResult Class¶
The solve
method of the GroundStateSolver
class returns a GroundStateResult
object.
Its properties and methods are described below.
properties¶
energy
: [float] - The energy reached by VQE, i.e. the electronic part of energy in Born-Oppenheimer approximation.
nuclear_repulsion_energy
: [float] - The energy of the nucleus in 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 statevector 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.
Methods¶
show_convergence_graph()
- Displays the energy vs. iteration number graph.