# -*- coding: utf-8 -*-
# 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.
""" TrotterizationFactory Class """
import logging
from .trotterization_base import TrotterizationBase
from .trotter import Trotter
from .suzuki import Suzuki
from .qdrift import QDrift
logger = logging.getLogger(__name__)
[docs]class TrotterizationFactory():
""" A factory for conveniently creating TrotterizationBase instances. """
[docs] @staticmethod
def build(mode: str = 'trotter',
reps: int = 1) -> TrotterizationBase:
""" A factory for conveniently creating TrotterizationBase instances.
Args:
mode: One of 'trotter', 'suzuki', 'qdrift'
reps: The number of times to repeat the Trotterization circuit.
Returns:
The desired TrotterizationBase instance.
Raises:
ValueError: A string not in ['trotter', 'suzuki', 'qdrift'] is given for mode.
"""
if mode == 'trotter':
return Trotter(reps=reps)
elif mode == 'suzuki':
return Suzuki(reps=reps)
elif mode == 'qdrift':
return QDrift(reps=reps)
raise ValueError('Trotter mode {} not supported'.format(mode))