# This code is part of KQCircuits
# Copyright (C) 2021 IQM Finland Oy
#
# This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public
# License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later
# version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along with this program. If not, see
# https://www.gnu.org/licenses/gpl-3.0.html.
#
# The software distribution should follow IQM trademark policy for open-source software
# (meetiqm.com/developers/osstmpolicy). IQM welcomes contributions to the code. Please see our contribution agreements
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from kqcircuits.simulations.simulation import Simulation
from kqcircuits.pya_resolver import pya
from kqcircuits.util.parameters import Param, pdt, add_parameters_from
from kqcircuits.chips.xmons_direct_coupling import XMonsDirectCoupling
from kqcircuits.simulations.port import InternalPort
from kqcircuits.elements.fluxlines.fluxline import Fluxline
from kqcircuits.junctions.junction import Junction
[docs]@add_parameters_from(Junction, junction_type="Sim")
@add_parameters_from(Fluxline, fluxline_type="none")
@add_parameters_from(XMonsDirectCoupling, "arm_width_a", "rr_cpl_width")
class XMonsDirectCouplingSim(Simulation):
# Re-define some XMonsDirectCoupling parameters with defaults changed:
qubit_spacing = Param(pdt.TypeDouble, "Qubit spacing", 3, unit="μm")
arm_width_b = Param(pdt.TypeDouble, "Qubit 2 arm width", 66, unit="μm")
waveguide_length = Param(
pdt.TypeDouble, "Length of waveguide stubs or distance between couplers and waveguide turning point", 100
)
cpl_width = Param(pdt.TypeDouble, "Qubit RR coupler width", 24, unit="μm")
junction_inductances = Param(
pdt.TypeList, "Qubit junction inductances", [13.5e-9, 13.5e-9, 13.5e-9], unit="[H, H, H]"
)
junction_capacitances = Param(
pdt.TypeList, "Qubit junction capacitances", [0.1e-15, 0.1e-15, 0.1e-15], unit="[F, F, F]"
)
produce_qubits = XMonsDirectCoupling.produce_qubits
[docs] def build(self):
# parameter used by produce_qubits
self.rr_cpl_width = (self.cpl_width, self.cpl_width, self.cpl_width)
self.produce_qubits()
# driveline 1
self.produce_waveguide_to_port(
port_nr=1,
location=self.refpoints["QB1_port_drive"],
term1=10,
towards=self.refpoints["QB1_port_drive"] + pya.DVector(-1, 1),
)
# driveline 2
self.produce_waveguide_to_port(
port_nr=2,
location=self.refpoints["QB2_port_drive"],
term1=10,
towards=self.refpoints["QB2_port_drive"] + pya.DVector(0, -1),
)
# driveline 3
self.produce_waveguide_to_port(
port_nr=3,
location=self.refpoints["QB3_port_drive"],
term1=10,
towards=self.refpoints["QB3_port_drive"] + pya.DVector(1, 1),
)
# readout 1
self.produce_waveguide_to_port(
port_nr=4,
a=5,
b=20,
location=self.refpoints["QB1_port_cplr1"],
towards=self.refpoints["QB1_port_cplr1"] + pya.DVector(0, 1),
use_internal_ports=True,
)
# readout 2
self.produce_waveguide_to_port(
port_nr=5,
a=5,
b=20,
location=self.refpoints["QB2_port_cplr1"],
towards=self.refpoints["QB2_port_cplr1"] + pya.DVector(0, 1),
use_internal_ports=True,
)
# readout 3
self.produce_waveguide_to_port(
port_nr=6,
a=5,
b=20,
location=self.refpoints["QB3_port_cplr1"],
towards=self.refpoints["QB3_port_cplr1"] + pya.DVector(0, 1),
use_internal_ports=True,
)
# qubits
self.ports.extend(
[
InternalPort(
7,
*self.etched_line(self.refpoints["QB1_port_squid_a"], self.refpoints["QB1_port_squid_b"]),
inductance=self.junction_inductances[0],
capacitance=self.junction_capacitances[0],
junction=True,
),
InternalPort(
8,
*self.etched_line(self.refpoints["QB2_port_squid_a"], self.refpoints["QB2_port_squid_b"]),
inductance=self.junction_inductances[1],
capacitance=self.junction_capacitances[1],
junction=True,
),
InternalPort(
9,
*self.etched_line(self.refpoints["QB3_port_squid_a"], self.refpoints["QB3_port_squid_b"]),
inductance=self.junction_inductances[2],
capacitance=self.junction_capacitances[2],
junction=True,
),
]
)