Source code for qiskit_metal.qlibrary.qubits.JJ_Dolan

# -*- coding: utf-8 -*-

# This code is part of Qiskit.
# (C) Copyright IBM 2017, 2021.
# This code is licensed under the Apache License, Version 2.0. You may
# obtain a copy of this license in the LICENSE.txt file in the root directory
# of this source tree or at
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# that they have been altered from the originals.
Josephson Junction (Dolan-Style)
REFERENCE: G. Dolan, Applied Physics Letters 31, 337 (1977)
from qiskit_metal import draw, Dict
from qiskit_metal.qlibrary.core.base import QComponent

[docs] class jj_dolan(QComponent): """ The base "JJ_Dolan" inherits the "QComponent" class. NOTE TO USER: Please be aware that when designing with this qcomponent, one must take care in accounting for the junction qgeometry when exporting to to GDS and/or to a simulator. This qcomponent should not be rendered for EM simulation. This creates a "Dolan"-style Josephson Junction consisting of two non-overlapping metal rectangles each connected to a larger rectangular pad. There is also a second, smaller rectangle drawn on a different metal level which overlaps part of one of the rectangular fingers. .. image:: JJ_Dolan.png .. meta:: Josephson Junction Dolan Default Options: * JJ_pad_lower_width: '25um' -- width of lower JJ metal region * JJ_pad_lower_height: '10um' -- height of lower JJ metal region * JJ_pad_lower_pos_x: '0um' -- the initial x-coord of the lower JJ pad * JJ_pad_lower_pos_y: '0um' -- the initial y-coord of the lower JJ pad * finger_lower_width: '1um' -- the width of the rectangular finger(s) * finger_lower_height: '20um' -- the length of the rectangular finger(s) * extension: '1um' -- the amount of rectangle extending beyond X-point * offset: '2um' -- the separation between finger and the 2nd metal level * second_metal_length: '5um' -- the length of the 2nd metal level * second_metal_width: '1um' -- the width of the 2nd metal level """ # Default drawing options default_options = Dict(JJ_pad_lower_width='25um', JJ_pad_lower_height='10um', JJ_pad_lower_pos_x='0', JJ_pad_lower_pos_y='0', finger_lower_width='1um', finger_lower_height='20um', extension='1um', offset='2um', second_metal_length='5um', second_metal_width='1um') """Default drawing options""" # Name prefix of component, if user doesn't provide name component_metadata = Dict(short_name='component') """Component metadata"""
[docs] def make(self): """Convert self.options into QGeometry.""" p = self.parse_options() # Parse the string options into numbers # draw the lower pad as a rectangle JJ_pad_lower = draw.rectangle(p.JJ_pad_lower_width, p.JJ_pad_lower_height, p.JJ_pad_lower_pos_x, p.JJ_pad_lower_pos_y) finger_lower = draw.rectangle( p.finger_lower_width, p.finger_lower_height, p.JJ_pad_lower_pos_x, 0.5 * (p.JJ_pad_lower_height + p.finger_lower_height)) # merge the lower pad and the finger into a single object design = draw.union(JJ_pad_lower, finger_lower) # copy the pad/finger and rotate it by 90 degrees design2 = draw.rotate(design, 90.0) # translate the second pad/finger to achieve the desired extension # for a Manhattan-like configuration design2 = draw.translate( design2, 0.5 * (p.JJ_pad_lower_height + p.finger_lower_height) - 0.5 * p.finger_lower_width - p.extension, 0.5 * (p.JJ_pad_lower_height + p.finger_lower_height) - 0.5 * p.finger_lower_width - p.extension) # now translate the second pad/finger to achieve the desired offset # from the first pad/finger design2 = draw.translate(design2, p.extension + p.finger_lower_width + p.offset) final_design = draw.union(design, design2) second_metal = draw.rectangle( p.second_metal_width, p.second_metal_length, p.JJ_pad_lower_pos_x + p.offset + 0.5 * p.finger_lower_width, 0.5 * p.JJ_pad_lower_height + p.finger_lower_height - 0.5 * p.second_metal_length) # translate everything so that the bottom left corner of the lower # pad is at the origin final_design = draw.translate(final_design, 0.5 * p.JJ_pad_lower_width, 0.5 * p.JJ_pad_lower_height) second_metal = draw.translate(second_metal, 0.5 * p.JJ_pad_lower_width, 0.5 * p.JJ_pad_lower_height) # now translate so that the bottom left corner is at the # user-defined coordinates (pos_x, pos_y) final_design = draw.translate(final_design, p.pos_x, p.pos_y) second_metal = draw.translate(second_metal, p.pos_x, p.pos_y) geom1 = {'design': final_design} self.add_qgeometry('poly', geom1, layer=p.layer, subtract=False) geom2 = {'design': second_metal} self.add_qgeometry('poly', geom2, layer=2.0, subtract=False)