qiskit.algorithms.VQE.get_energy_evaluation

VQE.get_energy_evaluation(operator, return_expectation=False)

Returns a function handle to evaluates the energy at given parameters for the ansatz.

This is the objective function to be passed to the optimizer that is used for evaluation.

パラメータ

• operator (OperatorBase) – The operator whose energy to evaluate.

• return_expectation (bool) – If True, return the ExpectationBase expectation converter used in the construction of the expectation value. Useful e.g. to evaluate other operators with the same expectation value converter.

戻り値

Energy of the hamiltonian of each parameter, and, optionally, the expectation converter.

例外

RuntimeError – If the circuit is not parameterized (i.e. has 0 free parameters).

戻り値の型

Callable[[np.ndarray], float | list[float]] | tuple[Callable[[np.ndarray], float | list[float]], ExpectationBase]