src/braket/default_simulator/density_matrix_simulation.py [47:68]:
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        )

    def apply_observables(self, observables: List[Observable]) -> None:
        """Applies the diagonalizing matrices of the given observables
        to the state of the simulation.

        This method can only be called once.

        Args:
            observables (List[Observable]): The observables to apply

        Raises:
            RuntimeError: If this method is called more than once
        """
        if self._post_observables is not None:
            raise RuntimeError("Observables have already been applied.")
        operations = list(
            sum(
                [observable.diagonalizing_gates(self._qubit_count) for observable in observables],
                (),
            )
        )
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src/braket/default_simulator/state_vector_simulation.py [71:92]:
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        )

    def apply_observables(self, observables: List[Observable]) -> None:
        """Applies the diagonalizing matrices of the given observables
        to the state of the simulation.

        This method can only be called once.

        Args:
            observables (List[Observable]): The observables to apply

        Raises:
            RuntimeError: If this method is called more than once
        """
        if self._post_observables is not None:
            raise RuntimeError("Observables have already been applied.")
        operations = list(
            sum(
                [observable.diagonalizing_gates(self._qubit_count) for observable in observables],
                (),
            )
        )
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