ExcitedStatesEigensolver

class ExcitedStatesEigensolver(transformation, solver)

Bases: qiskit.chemistry.algorithms.excited_states_solvers.excited_states_solver.ExcitedStatesSolver

The calculation of excited states via an Eigensolver algorithm

Parameters

transformation (Transformation) – Qubit Operator Transformation
solver (Union[Eigensolver, EigensolverFactory]) – Minimum Eigensolver or MESFactory object.

Methods

solve

ExcitedStatesEigensolver.solve(driver, aux_operators=None)

Compute Ground and Excited States properties.

Parameters

driver (BaseDriver) – a chemistry driver object which defines the chemical problem that is to be solved by this calculation.
aux_operators (Optional[List[Any]]) – Additional auxiliary operators to evaluate. Must be of type FermionicOperator if the qubit transformation is fermionic and of type BosonicOperator it is bosonic.

Raises

NotImplementedError - If an operator in aux_operators is not of type FermionicOperator .

Return type

Union [ElectronicStructureResult, VibronicStructureResult]

Returns

An eigenstate result. Depending on the transformation this can be an electronic structure or bosonic result.

Attributes

solver

Returns the minimum eigensolver or factory.

Return type

Union [Eigensolver, EigensolverFactory]

transformation

Returns the transformation used to obtain a qubit operator from the molecule.

Return type

Transformation

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