Loopback Capture Example¶

This notebook shows how to use Experiment.capture_loopback(...) to capture full-span loopback waveforms from READ_IN and MNTR_IN channels.

capture_loopback temporarily switches RF ports to loopback mode, executes the schedule, and restores the original RF-switch states automatically.

In [ ]:

import numpy as np

import qubex as qx

import numpy as np import qubex as qx

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# Initialize experiment session (replace paths/chip/qubits for your environment).
exp = qx.Experiment(
    chip_id="64Qv3",
    muxes=[2],
    config_dir="/home/shared/qubex-config/64Qv3/config",
    params_dir="/home/shared/qubex-config/64Qv3/params",
)

# Initialize experiment session (replace paths/chip/qubits for your environment). exp = qx.Experiment( chip_id="64Qv3", muxes=[2], config_dir="/home/shared/qubex-config/64Qv3/config", params_dir="/home/shared/qubex-config/64Qv3/params", )

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# Hardware connection is required for actual capture.
exp.connect()

# Hardware connection is required for actual capture. exp.connect()

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Q = exp.qubit_labels
R = exp.resonator_labels

schedule = qx.PulseSchedule()
with schedule as s:
    s.add(Q[0], qx.pulse.FlatTop(duration=112, amplitude=0.2, tau=0))
    s.add(Q[1], qx.pulse.Blank(duration=220))
    s.add(Q[1], qx.pulse.FlatTop(duration=128, amplitude=0.2, tau=0))
    s.add(Q[2], qx.pulse.Blank(duration=440))
    s.add(Q[2], qx.pulse.FlatTop(duration=144, amplitude=0.2, tau=0))
    s.add(Q[3], qx.pulse.Blank(duration=700))
    s.add(Q[3], qx.pulse.FlatTop(duration=160, amplitude=0.2, tau=0))

    s.add(R[0], qx.pulse.Blank(duration=120))
    s.add(R[0], qx.pulse.FlatTop(duration=320, amplitude=0.2, tau=0))
    s.add(R[1], qx.pulse.Blank(duration=180))
    s.add(R[1], qx.pulse.FlatTop(duration=320, amplitude=0.2, tau=0))
    s.add(R[2], qx.pulse.Blank(duration=620))
    s.add(R[2], qx.pulse.FlatTop(duration=280, amplitude=0.2, tau=0))
    s.add(R[3], qx.pulse.Blank(duration=980))
    s.add(R[3], qx.pulse.FlatTop(duration=240, amplitude=0.2, tau=0))

schedule.plot()

Q = exp.qubit_labels R = exp.resonator_labels schedule = qx.PulseSchedule() with schedule as s: s.add(Q[0], qx.pulse.FlatTop(duration=112, amplitude=0.2, tau=0)) s.add(Q[1], qx.pulse.Blank(duration=220)) s.add(Q[1], qx.pulse.FlatTop(duration=128, amplitude=0.2, tau=0)) s.add(Q[2], qx.pulse.Blank(duration=440)) s.add(Q[2], qx.pulse.FlatTop(duration=144, amplitude=0.2, tau=0)) s.add(Q[3], qx.pulse.Blank(duration=700)) s.add(Q[3], qx.pulse.FlatTop(duration=160, amplitude=0.2, tau=0)) s.add(R[0], qx.pulse.Blank(duration=120)) s.add(R[0], qx.pulse.FlatTop(duration=320, amplitude=0.2, tau=0)) s.add(R[1], qx.pulse.Blank(duration=180)) s.add(R[1], qx.pulse.FlatTop(duration=320, amplitude=0.2, tau=0)) s.add(R[2], qx.pulse.Blank(duration=620)) s.add(R[2], qx.pulse.FlatTop(duration=280, amplitude=0.2, tau=0)) s.add(R[3], qx.pulse.Blank(duration=980)) s.add(R[3], qx.pulse.FlatTop(duration=240, amplitude=0.2, tau=0)) schedule.plot()

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# Full-span loopback capture over the whole schedule duration.
result = exp.capture_loopback(
    schedule=schedule,
    n_shots=4096,
)

print(f"sampling_period_ns = {result.sampling_period_ns}")
for target, captures in result.data.items():
    shapes = [np.asarray(cap).shape for cap in captures]
    print(target, shapes)

# Visualize each captured waveform.
result.plot()

# Full-span loopback capture over the whole schedule duration. result = exp.capture_loopback( schedule=schedule, n_shots=4096, ) print(f"sampling_period_ns = {result.sampling_period_ns}") for target, captures in result.data.items(): shapes = [np.asarray(cap).shape for cap in captures] print(target, shapes) # Visualize each captured waveform. result.plot()