Source code for kqcircuits.simulations.xmons_direct_coupling_sim

# This code is part of KQCircuits
# Copyright (C) 2021 IQM Finland Oy
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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, ), ] )