Note
This page was generated from circuit-examples//A.Qubits//07-Transmon_floating_cl.ipynb.
Single Transmon - Floating with charge lines#
We’ll be creating a 2D design and adding a single transmon qcomponent with charge lines.
Create a standard pocket transmon qubit with charge lines for a ground plane, with two pads connected by a junction.
[1]:
# So, let us dive right in. For convenience, let's begin by enabling
# automatic reloading of modules when they change.
%load_ext autoreload
%autoreload 2
[2]:
import qiskit_metal as metal
from qiskit_metal import designs, draw
from qiskit_metal import MetalGUI, Dict, open_docs
[3]:
# Each time you create a new quantum circuit design,
# you start by instantiating a QDesign class.
# The design class `DesignPlanar` is best for 2D circuit designs.
design = designs.DesignPlanar()
[4]:
#Launch Qiskit Metal GUI to interactively view, edit, and simulate QDesign: Metal GUI
gui = MetalGUI(design)
[5]:
# To force overwrite a QComponent with an existing name.
# This is useful when re-running cells in a notebook.
design.overwrite_enabled = True
A transmon qubit#
You can create a ready-made transmon qubit with charge lines from the QComponent Library, qiskit_metal.qlibrary.qubits. transmon_pocket_cl.py is the file containing our qubit so transmon_pocket_cl is the module we import. The TransmonPocketCL class is our transmon qubit. Like all quantum components, TransmonPocketCL inherits from QComponent.
Connector lines can be added using the connection_pads dictionary. Each connector pad has a name and a list of default properties.
[6]:
from qiskit_metal.qlibrary.qubits.transmon_pocket_cl import TransmonPocketCL
# Be aware of the default_options that can be overridden by user.
TransmonPocketCL.get_template_options(design)
[6]:
{'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',
'make_CL': True,
'cl_gap': '6um',
'cl_width': '10um',
'cl_length': '20um',
'cl_ground_gap': '6um',
'cl_pocket_edge': '0',
'cl_off_center': '50um',
'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'}
[7]:
transmon_options = dict(
pos_x = '1mm',
pos_y = '2mm',
orientation = '90',
connection_pads=dict(
a = dict(loc_W=+1, loc_H=-1, pad_width='70um', cpw_extend = '50um'),
b = dict(loc_W=-1, loc_H=-1, pad_width='125um', cpw_extend = '50um', pad_height='60um'),
c = dict(loc_W=+1, loc_H=+1, pad_width='110um', cpw_extend = '50um')
),
gds_cell_name='FakeJunction_01',
)
# Create a new Transmon Pocket object with name 'Q1'
q1 = TransmonPocketCL(design, 'Q1', options=transmon_options)
gui.rebuild() # rebuild the design and plot
gui.autoscale() # resize GUI to see QComponent
gui.zoom_on_components(['Q1']) #Can also gui.zoom_on_components([q1.name])
Let’s see what the Q1 object looks like
[8]:
q1 #print Q1 information
[8]:
name: Q1
class: TransmonPocketCL
options:
'pos_x' : '1mm',
'pos_y' : '2mm',
'connection_pads' : {
'a' : {
'pad_gap' : '15um',
'pad_width' : '70um',
'pad_height' : '30um',
'pad_cpw_shift' : '5um',
'pad_cpw_extent' : '25um',
'cpw_width' : 'cpw_width',
'cpw_gap' : 'cpw_gap',
'cpw_extend' : '50um',
'pocket_extent' : '5um',
'pocket_rise' : '65um',
'loc_W' : 1,
'loc_H' : -1,
},
'b' : {
'pad_gap' : '15um',
'pad_width' : '125um',
'pad_height' : '60um',
'pad_cpw_shift' : '5um',
'pad_cpw_extent' : '25um',
'cpw_width' : 'cpw_width',
'cpw_gap' : 'cpw_gap',
'cpw_extend' : '50um',
'pocket_extent' : '5um',
'pocket_rise' : '65um',
'loc_W' : -1,
'loc_H' : -1,
},
'c' : {
'pad_gap' : '15um',
'pad_width' : '110um',
'pad_height' : '30um',
'pad_cpw_shift' : '5um',
'pad_cpw_extent' : '25um',
'cpw_width' : 'cpw_width',
'cpw_gap' : 'cpw_gap',
'cpw_extend' : '50um',
'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' : '90',
'make_CL' : True,
'cl_gap' : '6um',
'cl_width' : '10um',
'cl_length' : '20um',
'cl_ground_gap' : '6um',
'cl_pocket_edge' : '0',
'cl_off_center' : '50um',
'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' : 'FakeJunction_01',
module: qiskit_metal.qlibrary.qubits.transmon_pocket_cl
id: 1
Save screenshot as a .png formatted file.
[9]:
gui.screenshot()
[10]:
# 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#
[11]:
gui.main_window.close()
[11]:
True
[ ]:
For more information, review the Introduction to Quantum Computing and Quantum Hardware lectures below
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Lecture Video | Lecture Notes | Lab |
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Lecture Video | Lecture Notes | Lab |
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Lecture Video | Lecture Notes | Lab |
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Lecture Video | Lecture Notes | Lab |
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Lecture Video | Lecture Notes | Lab |
|
Lecture Video | Lecture Notes | Lab |