Note

This page was generated from circuit-examples/E.Input-output-coupling/41-LaunchPad.ipynb.

CPW Launch Pad

💡 Running in Colab or Binder? Skip the desktop GUI install — the cell below grabs the lite (no-Qt) wheel, and qm.gui(design) auto-picks an inline matplotlib viewer with the same API (gui.rebuild(), gui.screenshot(), gui.edit_component(...)) as the desktop MetalGUI.

# In Colab / Binder, uncomment to install Quantum Metal (lite, no Qt).
# Locally you should already have it via `pip install quantum-metal` or
# `pip install 'quantum-metal[gui]'` for the desktop GUI.
# !pip install -q quantum-metal

💡 Using this tutorial without the Qt GUI

This tutorial uses the desktop MetalGUI. To follow along on Colab, Binder, JupyterHub, or any environment where Qt isn’t available, replace any ``gui.rebuild()`` / ``gui.screenshot()`` call with ``qm.view(design)`` — it renders the design to a matplotlib Figure you can display inline or save with fig.savefig(...).

See 1.1 Quick start for a complete runnable walkthrough and `docs/headless-usage.rst <../../../docs/headless-usage.rst>`__ for the full reference.

Preparations

Import key libraries and open the Metal GUI. Also we configure the notebook to enable overwriting of existing components

from qiskit_metal import designs, draw
from qiskit_metal import MetalGUI, Dict, Headings

design = designs.DesignPlanar()
gui = MetalGUI(design)

# if you disable the next line, then you will need to delete a component [<component>.delete()] before recreating it
design.overwrite_enabled = True

from qiskit_metal.qlibrary.terminations.launchpad_wb_coupled import (
    LaunchpadWirebondCoupled,
)

# Explore the options of the LaunchpadWirebondCoupled

LaunchpadWirebondCoupled.get_template_options(design)

{'layer': '1',
 'trace_width': 'cpw_width',
 'trace_gap': 'cpw_gap',
 'coupler_length': '62.5um',
 'lead_length': '25um',
 'pos_x': '0um',
 'pos_y': '0um',
 'orientation': '0'}

# Setup the launchpad location and orientation
launch_options = dict(
    pos_x="990um", pos_y="2812um", orientation="270", lead_length="30um"
)

lp = LaunchpadWirebondCoupled(design, "P4_Q", options=launch_options)

gui.rebuild()
gui.autoscale()

# Get a list of all the qcomponents in QDesign and then zoom on them.
all_component_names = design.components.keys()

gui.zoom_on_components(all_component_names)

# Look at the options of the launch pad in QDesign.
lp.options

{'layer': '1',
 'trace_width': 'cpw_width',
 'trace_gap': 'cpw_gap',
 'coupler_length': '62.5um',
 'lead_length': '30um',
 'pos_x': '990um',
 'pos_y': '2812um',
 'orientation': '270'}

# Save screenshot as a .png formatted file.
gui.screenshot()

# Screenshot the canvas only as a .png formatted file.
gui.figure.savefig("shot.png")

from IPython.display import Image, display

_disp_ops = dict(width=500)
display(Image("shot.png", **_disp_ops))

# Closing the Qiskit Metal GUI
gui.main_window.close()

True

For more information, review the Introduction to Quantum Computing and Quantum Hardware lectures below

Superconducting Qubits I: Quantizing a Harmonic Oscillator, Josephson Junctions Part 1	Lecture Video	Lecture Notes	Lab
Superconducting Qubits I: Quantizing a Harmonic Oscillator, Josephson Junctions Part 2	Lecture Video	Lecture Notes	Lab
Superconducting Qubits I: Quantizing a Harmonic Oscillator, Josephson Junctions Part 3	Lecture Video	Lecture Notes	Lab
Superconducting Qubits II: Circuit Quantum Electrodynamics, Readout and Calibration Methods Part 1	Lecture Video	Lecture Notes	Lab
Superconducting Qubits II: Circuit Quantum Electrodynamics, Readout and Calibration Methods Part 2	Lecture Video	Lecture Notes	Lab
Superconducting Qubits II: Circuit Quantum Electrodynamics, Readout and Calibration Methods Part 3	Lecture Video	Lecture Notes	Lab