Note

This page was generated from circuit-examples/D.Qubit-couplers/33-TwoTransmonsWithMeander.ipynb.

Bus Resonator Coupler (transmon-transmon)

%load_ext autoreload
%autoreload 2

import qiskit_metal as metal
from qiskit_metal import designs, draw
from qiskit_metal import MetalGUI, Dict, Headings
import pyEPR as epr

Create the design in Metal

Setup a design of a given dimension. Dimensions will be respected in the design rendering. Note that the design size extends from the origin into the first quadrant.

design = designs.DesignPlanar({}, True)
design.chips.main.size["size_x"] = "4mm"
design.chips.main.size["size_y"] = "6mm"

gui = MetalGUI(design)

Create two transmons with one meander resonator.

from qiskit_metal.qlibrary.qubits.transmon_pocket import TransmonPocket
from qiskit_metal.qlibrary.tlines.meandered import RouteMeander

TransmonPocket.get_template_options(design)

{'pos_x': '0um',
 'pos_y': '0um',
 'connection_pads': {},
 '_default_connection_pads': {'pad_gap': '15um',
  'pad_width': '125um',
  'pad_height': '30um',
  'pad_cpw_shift': '5um',
  'pad_cpw_extent': '25um',
  'cpw_width': 'cpw_width',
  'cpw_gap': 'cpw_gap',
  'cpw_extend': '100um',
  'pocket_extent': '5um',
  'pocket_rise': '65um',
  'loc_W': '+1',
  'loc_H': '+1'},
 'chip': 'main',
 'pad_gap': '30um',
 'inductor_width': '20um',
 'pad_width': '455um',
 'pad_height': '90um',
 'pocket_width': '650um',
 'pocket_height': '650um',
 'orientation': '0',
 'hfss_wire_bonds': False,
 'q3d_wire_bonds': False,
 'hfss_inductance': '10nH',
 'hfss_capacitance': 0,
 'hfss_resistance': 0,
 'hfss_mesh_kw_jj': 7e-06,
 'q3d_inductance': '10nH',
 'q3d_capacitance': 0,
 'q3d_resistance': 0,
 'q3d_mesh_kw_jj': 7e-06,
 'gds_cell_name': 'my_other_junction'}

RouteMeander.get_template_options(design)

{'pin_inputs': {'start_pin': {'component': '', 'pin': ''},
  'end_pin': {'component': '', 'pin': ''}},
 'fillet': '0',
 'lead': {'start_straight': '0mm',
  'end_straight': '0mm',
  'start_jogged_extension': '',
  'end_jogged_extension': ''},
 'total_length': '7mm',
 'chip': 'main',
 'layer': '1',
 'trace_width': 'cpw_width',
 'meander': {'spacing': '200um', 'asymmetry': '0um'},
 'snap': 'true',
 'prevent_short_edges': 'true',
 'hfss_wire_bonds': False,
 'q3d_wire_bonds': False}

q1 = TransmonPocket(
    design,
    "Q1",
    options=dict(
        pad_width="425 um",
        pocket_height="650um",
        connection_pads=dict(readout=dict(loc_W=+1, loc_H=+1, pad_width="200um")),
    ),
)

q2 = TransmonPocket(
    design,
    "Q2",
    options=dict(
        pos_x="2.0 mm",
        pad_width="425 um",
        pocket_height="650um",
        connection_pads=dict(readout=dict(loc_W=-1, loc_H=+1, pad_width="200um")),
    ),
)

coupler_options = Dict(
    pin_inputs=Dict(
        start_pin=Dict(component="Q1", pin="readout"),
        end_pin=Dict(component="Q2", pin="readout"),
    ),
    fillet="99.9um",
    total_length="5mm",
    lead=Dict(start_straight="200um"),
)


bus = RouteMeander(design, "coupler", options=coupler_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)

# 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()

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