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qiskit.opflow.evolutions.evolution_factory의 소스 코드

# This code is part of Qiskit.
#
# (C) Copyright IBM 2020.
#
# 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.

""" EvolutionFactory Class """

from qiskit.opflow.operator_base import OperatorBase
from qiskit.opflow.evolutions.evolution_base import EvolutionBase
from qiskit.opflow.evolutions.pauli_trotter_evolution import PauliTrotterEvolution
from qiskit.opflow.evolutions.matrix_evolution import MatrixEvolution


[문서]class EvolutionFactory: """A factory class for convenient automatic selection of an Evolution algorithm based on the Operator to be converted. """
[문서] @staticmethod def build(operator: OperatorBase = None) -> EvolutionBase: r""" A factory method for convenient automatic selection of an Evolution algorithm based on the Operator to be converted. Args: operator: the Operator being evolved Returns: EvolutionBase: the ``EvolutionBase`` best suited to evolve operator. Raises: ValueError: If operator is not of a composition for which we know the best Evolution method. """ primitive_strings = operator.primitive_strings() if "Matrix" in primitive_strings: return MatrixEvolution() elif "Pauli" in primitive_strings or "SparsePauliOp" in primitive_strings: # TODO figure out what to do based on qubits and hamming weight. return PauliTrotterEvolution() else: raise ValueError("Evolutions of mixed Operators not yet supported.")