qiskit.chemistry.algorithms.ExcitedStatesEigensolver

class ExcitedStatesEigensolver(transformation, solver)

The calculation of excited states via an Eigensolver algorithm

Parameters

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

__init__(transformation, solver)

Parameters

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

Methods


`__init__`(transformation, solver)	type transformation`Transformation`
`solve`(driver[, aux_operators])	Compute Ground and Excited States properties.


`solver`	Returns the minimum eigensolver or factory.
`transformation`	Returns the transformation used to obtain a qubit operator from the molecule.

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.

Returns the minimum eigensolver or factory.

Return type

Union [Eigensolver, EigensolverFactory]

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

Return type

Transformation

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