from collections import OrderedDict
import numpy as np
from qiskit_metal import Dict
from qiskit_metal.qlibrary.core import QComponent, QRoute, QRoutePoint
from qiskit_metal.qlibrary.qubits.transmon_cross import TransmonCross
[docs]
class QubitCavity(QComponent):
"""
QubitCavity class represents a coupled qubit-cavity system.
It contains methods to create the qubit, cavity, coupler, and CPWs.
"""
default_options = Dict(
chip = 'main',
cavity_claw_options = Dict(
coupler_type = 'CLT',
coupler_options = Dict(
orientation = '180',
coupling_length = '200um'
),
cpw_opts = Dict(
total_length = '4000um',
left_options = Dict(
lead = Dict(
start_straight = 0,
end_straight = 0,
start_jogged_extension = 0,
end_jogged_extension = 0
),
fillet = '49.9um',
),
right_options = Dict(
meander=Dict(spacing='100um', asymmetry='0um'),
fillet = '49.9um',
)
)
),
qubit_options = Dict(
connection_pads=Dict(),
claw_cpw_length = '50um',
orientation = '180',
pos_y = '1500um'
)
)
component_metadata = Dict(short_name='qubitcavity')
"""Component metadata"""
"""Default options"""
[docs]
def copier(self, d, u):
for k, v in u.items():
if not isinstance(v, str) and not isinstance(v, float) and not isinstance(v, bool) and not isinstance(v, int) and v is not None and not isinstance(v, list):
d[k] = self.copier(d.get(k, {}), v)
else:
d[k] = v
return d
[docs]
def make(self):
p = self.p
self.make_qubit()
self.make_cavity()
self.make_pins()
print(
'There might be "kinks" in the CPW, which is a known issue in `qiskit-metal`.\n'
'To resolve this, try adjusting the `start_straight` or `end_straight` parameters.\n'
'For more details and resolution tips, check out this guide:\n'
'https://qiskit-community.github.io/qiskit-metal/tut/2-From-components-to-chip/2.12-Simple-Meander.html'
)
[docs]
def make_qubit(self):
"""
Creates a qubit based on the specified qubit options.
Returns:
None
"""
p = self.p
qubit_opts = Dict()
self.copier(qubit_opts, p.qubit_options)
qubit_opts["pos_y"] = 0
try:
qubit_opts["pos_x"] = "-1500um" if p.cavity_claw_options['cpw_opts'].total_length > 2.500 else "-1000um"
except:
qubit_opts["pos_x"] = "-1500um" if p.cavity_claw_options['cpw_options'].total_length > 2.500 else "-1000um"
self.qubit = TransmonCross(self.design, "{}_xmon".format(self.name), options = qubit_opts)
[docs]
def make_cavity(self):
"""
This method is used to create a cavity in the coupled system.
It calls the make_coupler() and make_cpws() methods to create the necessary components.
"""
self.make_coupler()
self.make_cpws()
[docs]
def make_coupler(self):
"""
Creates a coupler based on the specified coupling type in the cavity options.
Returns:
None
"""
p = self.p
temp_opts = Dict()
try:
self.copier(temp_opts, p.cavity_claw_options['coupler_options'])
except:
self.copier(temp_opts, p.cavity_claw_options['cplr_opts'])
if(p.cavity_claw_options['coupler_type'].upper() == "CLT"):
from qiskit_metal.qlibrary.couplers.coupled_line_tee import \
CoupledLineTee
self.coupler = CoupledLineTee(self.design, "{}_CLT_coupler".format(self.name), options=temp_opts)
elif(p.cavity_claw_options['coupler_type'].lower() == 'capn' or p.cavity_claw_options['coupler_type'].lower() == 'ncap' or p.cavity_claw_options['coupler_type'].lower() == 'capninterdigitaltee'):
from qiskit_metal.qlibrary.couplers.cap_n_interdigital_tee import \
CapNInterdigitalTee
self.coupler = CapNInterdigitalTee(self.design, '{}_capn_coupler'.format(self.name), options=temp_opts)
[docs]
def make_cpws(self):
"""
Creates the CPWs (Coplanar Waveguides) for the coupled systems.
Returns:
None
"""
from qiskit_metal.qlibrary.tlines.meandered import RouteMeander
p = self.p
try:
p.cpw_opts = p.cavity_claw_options['cpw_opts']
except:
p.cpw_opts = p.cavity_claw_options['cpw_options']
left_opts = Dict()
left_opts.update({'total_length': (p.cpw_opts.total_length if p.cavity_claw_options['coupler_type'] == 'capacitive' else p.cpw_opts.total_length/2) })
left_opts.update({'pin_inputs':Dict(
start_pin = Dict(
component = '',
pin = ''
),
end_pin = Dict(
component = '',
pin = ''
)
)})
self.copier(left_opts, p.cpw_opts.left_options)
if p.cavity_claw_options["coupler_type"].lower() == "clt" and self.coupler.options["coupling_length"] > 0.150:
adj_distance = self.coupler.options["coupling_length"]
else:
adj_distance = 0
jogs = OrderedDict()
jogs[0] = ["R90", f'{adj_distance/(1.5)}um']
left_opts.update({"lead" : Dict(
start_straight = "150um",
end_straight = "50um",
start_jogged_extension = jogs
)})
left_opts.update({"pin_inputs" : Dict(start_pin = Dict(component = self.coupler.name,
pin = 'second_end'),
end_pin = Dict(component = self.qubit.name,
pin = list(self.qubit.options["connection_pads"].keys())[0]))})
left_opts.update({"meander" : Dict(
spacing = "100um",
asymmetry = f'{adj_distance/(3)}um' # need this to make CPW asymmetry half of the coupling length
)}) # if not, sharp kinks occur in CPW :(
# cpw = RouteMeander(design, 'cpw', options = opts)
left_opts['pin_inputs']['start_pin'].update({'component':self.qubit.name})
left_opts['pin_inputs']['start_pin'].update({'pin':list(self.qubit.options["connection_pads"].keys())[0]})
left_opts['pin_inputs']['end_pin'].update({'component':self.coupler.name})
left_opts['pin_inputs']['end_pin'].update({'pin':'second_end'})
self.LeftMeander = RouteMeander(self.design, "{}_left_cpw".format(self.name), options = left_opts)
if(p.cavity_claw_options['coupler_type'] == 'inductive'):
right_opts = Dict()
right_opts.update({'total_length':p.cpw_opts.total_length/2})
right_opts.update({'pin_inputs':Dict(
start_pin = Dict(
component = '',
pin = ''
),
end_pin = Dict(
component = '',
pin = ''
)
)})
right_opts['pin_inputs']['end_pin'].update({'component':p.cpw_opts.pin_inputs.end_pin.component})
right_opts['pin_inputs']['end_pin'].update({'pin':p.cpw_opts.pin_inputs.end_pin.pin})
right_opts['pin_inputs']['start_pin'].update({'component':self.coupler.name})
right_opts['pin_inputs']['start_pin'].update({'pin':'second_start'})
self.copier(right_opts, p.cpw_opts.right_options)
self.RightMeander = RouteMeander(self.design, "{}_right_cpw".format(self.name), options = right_opts)
self.add_qgeometry('path', self.RightMeander.qgeometry_dict('path'), chip = p.chip)
[docs]
def make_pins(self):
"""
Adds pins to the coupled system.
Retrieves pin information from the coupler and adds the pins to the system.
Args:
None
Returns:
None
"""
start_dict = self.coupler.get_pin('prime_start')
end_dict = self.coupler.get_pin('prime_end')
self.add_pin('prime_start', start_dict['points'], start_dict['width'])
self.add_pin('prime_end', end_dict['points'], end_dict['width'])
[docs]
def make_wirebond_pads(self):
from qiskit_metal.qlibrary.terminations.launchpad_wb import \
LaunchpadWirebond
from qiskit_metal.qlibrary.tlines.straight_path import RouteStraight
p = self.p
options = Dict(
orientation = -90,
pos_y = (float)(self.coupler.options.pos_y[:-2]) + 2.75,
trace_width = p.cavity_claw_options.cpw_opts.left_options.trace_width,
trace_gap = p.cavity_claw_options.cpw_opts.left_options.trace_gap
)
wb1 = LaunchpadWirebond(self.design, 'wb_top', options=options)
options = Dict(
orientation = 90,
pos_y = (float)(self.coupler.options.pos_y[:-2]) - 2.75,
trace_width = p.cavity_claw_options.cpw_opts.left_options.trace_width,
trace_gap = p.cavity_claw_options.cpw_opts.left_options.trace_gap
)
wb2 = LaunchpadWirebond(self.design, 'wb_bottom', options=options)
feedline_opts = Dict(pin_inputs = Dict(start_pin = Dict(component = 'wb_top',
pin = 'tie'),
end_pin = Dict(component = 'wb_bottom',
pin = 'tie')),
trace_width = p.cavity_claw_options.cpw_opts.left_options.trace_width,
trace_gap = p.cavity_claw_options.cpw_opts.left_options.trace_gap)
feedline = RouteStraight(self.design, 'feedline', options = feedline_opts)
[docs]
def show(self, gui, include_wirebond_pads=False, **kwargs):
if include_wirebond_pads:
self.make_wirebond_pads()
else:
if "feedline" in self.design.components:
self.design.delete_component("wb_top")
self.design.delete_component("wb_bottom")
self.design.delete_component("feedline")
gui.rebuild()
gui.autoscale()
figure_name = kwargs.get('figure_name', "QubitCavity.png")
gui.screenshot(figure_name)
[docs]
def to_gds(self, filename, include_wirebond_pads=False):
if include_wirebond_pads:
self.make_wirebond_pads()
else:
if "feedline" in self.design.components:
self.design.delete_component("wb_top")
self.design.delete_component("wb_bottom")
self.design.delete_component("feedline")
a_gds = self.design.renderers.gds
a_gds.options['cheese']['view_in_file']['main'][1]=False
a_gds.options['no_cheese']['view_in_file']['main'][1] = False
a_gds.export_to_gds(f'{filename}.gds')
