Compiling a QGL2 CPMG and plotting the output


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from pyqgl2.main import compile_function, qgl2_compile_to_hardware
from pyqgl2.test_cl import create_default_channelLibrary
from pyqgl2.qreg import QRegister
from QGL import plot_pulse_files, ChannelLibrary
import numpy as np

Should sequences be compiled to hardware, or just to QGL?

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toHW = True

Create a test ChannelLibrary

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create_default_channelLibrary(toHW, True)
# Alternatively could load an existing library, or create one here; see the 'AllXY' notebook

Create needed qubit(s)

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# For QGL2, use a QRegister, not a QGL Qubit
q = QRegister(1)

Compile to QGL1

To turn on debug output, uncomment the next 4 lines

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#from pyqgl2.ast_util import NodeError
#from pyqgl2.debugmsg import DebugMsg


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# Insert proper path to QGL2 source and name of qgl2main if not so marked
# Here we compile the named function in the named file from QGL2 to QGL1 and return the new function

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tCalR = 2 # calRepeats
cpmgNumPulses = [0, 2, 4, 6]
cpmgSpacing = 500e-9
qgl1MainFunc = compile_function("../src/python/qgl2/basic_sequences/", "CPMG", 
                                (q, cpmgNumPulses, cpmgSpacing, tCalR))

Generate pulse sequences

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# Now run the QGL1 function, producing a list of sequences
seqs = qgl1MainFunc()

Optionally compile to machine instructions

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if toHW:
    from qgl2.basic_sequences.helpers import delay_descriptor, cal_descriptor
    axis_desc = [
            # NOTE: numPulses is not a numpy array, so cannot multiply by a float
            # But thankfully, np.array(np.array) = np.array so this is always a good move here.
            delay_descriptor(cpmgSpacing * np.array(cpmgNumPulses)),
            cal_descriptor(('qubit',), tCalR)
    metaFileName = qgl2_compile_to_hardware(seqs, filename="CPMG/CPMG", axis_descriptor=axis_desc)
    print(f"Generated sequence details in '{metaFileName}'")
    # Plot the sequences
    p = plot_pulse_files(metaFileName)
    # Explicitly display the graph which fails to auto-draw in some cases
    from QGL.Scheduler import schedule
    from IPython.lib.pretty import pretty