Source code for qiskit.algorithms.evolvers.evolution_result

# This code is part of Qiskit.
#
# (C) Copyright IBM 2021, 2022.
#
# This code is licensed under the Apache License, Version 2.0. You may
# obtain a copy of this license in the LICENSE.txt file in the root directory
# of this source tree or at http://www.apache.org/licenses/LICENSE-2.0.
#
# Any modifications or derivative works of this code must retain this
# copyright notice, and modified files need to carry a notice indicating
# that they have been altered from the originals.

"""Class for holding evolution result."""

from __future__ import annotations

from qiskit import QuantumCircuit
from qiskit.algorithms.list_or_dict import ListOrDict
from qiskit.opflow import StateFn, OperatorBase
from qiskit.utils.deprecation import deprecate_func
from ..algorithm_result import AlgorithmResult


class EvolutionResult(AlgorithmResult):
    """Deprecated: Class for holding evolution result.

    The EvolutionResult class has been superseded by the
    :class:`qiskit.algorithms.time_evolvers.TimeEvolutionResult` class.
    This class will be deprecated in a future release and subsequently
    removed after that.

    """

    @deprecate_func(
        additional_msg=(
            "Instead, use the class ``qiskit.algorithms.time_evolvers.TimeEvolutionResult``. "
            "See https://qisk.it/algo_migration for a migration guide."
        ),
        since="0.24.0",
    )
    def __init__(
        self,
        evolved_state: StateFn | QuantumCircuit | OperatorBase,
        aux_ops_evaluated: ListOrDict[tuple[complex, complex]] | None = None,
    ):
        """
        Args:
            evolved_state: An evolved quantum state.
            aux_ops_evaluated: Optional list of observables for which expected values on an evolved
                state are calculated. These values are in fact tuples formatted as (mean, standard
                deviation).
        """

        self.evolved_state = evolved_state
        self.aux_ops_evaluated = aux_ops_evaluated