C贸digo fuente para qiskit.algorithms.time_evolvers.classical_methods.scipy_real_evolver

# This code is part of Qiskit.
# (C) Copyright IBM 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
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"""Classical Quantum Real Time Evolution."""
from .evolve import _evolve
from ..time_evolution_problem import TimeEvolutionProblem
from ..time_evolution_result import TimeEvolutionResult
from ..real_time_evolver import RealTimeEvolver

[documentos]class SciPyRealEvolver(RealTimeEvolver): r"""Classical Evolver for real time evolution. Evolves an initial state :math:`|\Psi\rangle` for a time :math:`t` under a Hamiltonian :math:`H`, as provided in the ``evolution_problem``. Note that the precision of the evolver does not depend on the number of timesteps taken. """ def __init__(self, num_timesteps: int): """ Args: num_timesteps: The number of timesteps in the simulation. Raises: ValueError: If `steps` is not a positive integer. """ self.num_timesteps = num_timesteps
[documentos] def evolve(self, evolution_problem: TimeEvolutionProblem) -> TimeEvolutionResult: r"""Perform real time evolution :math:`\exp(-i t H)|\Psi\rangle`. Evolves an initial state :math:`|\Psi\rangle` for a time :math:`t` under a Hamiltonian :math:`H`, as provided in the ``evolution_problem``. Args: evolution_problem: The definition of the evolution problem. Returns: Evolution result which includes an evolved quantum state. """ return _evolve(evolution_problem, self.num_timesteps, real_time=True)