Note

This page was generated from circuit-examples/A.Qubits/04-Interdigitated_Transmon.ipynb.

Interdigitated Transmon Qubits

This demo notebook goes over how to use the interdigitated transmon component, similar to those describedin Gambetta et. al., IEEE Trans. on Superconductivity Vol. 27, No. 1 (2007).

First, let’s import the key libraries for qiskit metal:

# Demo notebook for interdigitatd transmon qubit design
import qiskit_metal as metal
from qiskit_metal import designs, draw
from qiskit_metal import MetalGUI, Dict  # , open_docs

Next, let’s fire up the GUI:

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

The name of the component located in the qlibrary is “Transmon_Interdigitated” and we can take a look at the various input options:

from qiskit_metal.qlibrary.qubits.Transmon_Interdigitated import TransmonInterdigitated

TransmonInterdigitated.default_options

{'pad_width': '1000um',
 'pad_height': '300um',
 'finger_width': '50um',
 'finger_height': '100um',
 'finger_space': '50um',
 'pad_pos_x': '0um',
 'pad_pos_y': '0um',
 'comb_width': '50um',
 'comb_space_vert': '50um',
 'comb_space_hor': '50um',
 'jj_width': '20um',
 'cc_space': '50um',
 'cc_width': '100um',
 'cc_height': '100um',
 'cc_topleft_space': '50um',
 'cc_topleft_width': '100um',
 'cc_topleft_height': '100um',
 'cc_topright_space': '50um',
 'cc_topright_width': '100um',
 'cc_topright_height': '100um',
 'pos_x': '0um',
 'pos_y': '0um',
 'orientation': '0.0',
 'rotation_top_pad': '180',
 'layer': '1'}

Now let’s create three transmons, each centered at a specific (x,y) coordinate:

from qiskit_metal.qlibrary.qubits.Transmon_Interdigitated import TransmonInterdigitated

design.overwrite_enabled = True
q1 = TransmonInterdigitated(
    design, "qubit1", options=dict(pos_x="-2.0mm", orientation="-90")
)
gui.rebuild()
gui.autoscale()
gui.zoom_on_components(["qubit1"])  # Can also gui.zoom_on_components([q1.name])

# 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