Custom

Custom Drive Shaper config

If one desires to develop his own drive shaping method, a subclass of qubosolver.pipeline.drive.BaseDriveShaper should be implemented with a mandatory generate method.

The generate method syntax is generate(register: Register, instance: QUBOInstance) -> tuple[Drive, QUBOSolution] with arguments:

• a Register instance specifying the qubits we work with.
• a QUBOInstance specifying the qubo problem we target.

It returns:

• an instance of qoolqit.Drive
• a QUBOSolution specyfing the solution that may be used by a solver.

For concrete examples, we have the HeuristicDriveShaper and the OptimizedDriveShaper and their current implementations lie in qubosolver.pipeline.drive.py.

Let us show an example of a custom simple hard-coded drive shaper.

from qoolqit import Drive, Constant, Ramp, Register
from qubosolver.pipeline.drive import BaseDriveShaper
from qubosolver.data import QUBOSolution
from qubosolver.config import (
    DriveShapingConfig,
    SolverConfig,
)

class SimpleShaper(BaseDriveShaper):
    def generate(
        self,
        register: Register,
    ) -> tuple[Drive, QUBOSolution]:

        # Defining the drive parameters
        omega = 2.0
        delta_i = -4.0 * omega
        delta_f = -delta_i
        T = 200.0

        # Defining the drive
        wf_amp = Constant(T, omega)
        wf_det = Ramp(T, delta_i, delta_f)
        drive = Drive(amplitude=wf_amp, detuning=wf_det)

        return drive, QUBOSolution(torch.Tensor(), torch.Tensor())

config = SolverConfig(
    use_quantum=True,
    drive_shaping=DriveShapingConfig(drive_shaping_method=SimpleShaper),
)