GroundStateSolver

abstract GroundStateSolver.evaluate_operators(state, operators)

Evaluates additional operators at the given state.

Parameters

• state (Union[str, dict, Result, list, ndarray, Statevector, QuantumCircuit, Instruction, OperatorBase]) – any kind of input that can be used to specify a state. See also StateFn for more details.
• operators (Union[WeightedPauliOperator, OperatorBase, list, dict]) – either a single, list or dictionary of WeightedPauliOperator``s or any kind of operator implementing the ``OperatorBase.

Return type

Union[float, List[float], Dict[str, List[float]]]

Returns

The expectation value of the given operator(s). The return type will be identical to the format of the provided operators.

abstract GroundStateSolver.returns_groundstate()

Whether this class returns only the ground state energy or also the ground state itself.

Return type

bool

Returns

True, if this class also returns the ground state in the results object. False otherwise.

abstract GroundStateSolver.solve(driver, aux_operators=None)

Compute the ground state energy of the molecule that was supplied via the driver.

Parameters

• driver (BaseDriver) – a chemistry driver object which defines the chemical problem that is to be solved by this calculation.
• aux_operators (Union[List[FermionicOperator], List[BosonicOperator], None]) – Additional auxiliary operators to evaluate. Must be of type FermionicOperator if the qubit transformation is fermionic and of type BosonicOperator it is bosonic.

Return type

Union[ElectronicStructureResult, VibronicStructureResult]

Returns

An eigenstate result.

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

Return type

Transformation