kqcircuits.qubits.double_pads

class kqcircuits.qubits.double_pads.DoublePads

Bases: kqcircuits.qubits.qubit.Qubit

A two-island qubit, consisting of two rounded rectangles shunted by a junction, with one capacitive coupler.

Contains a coupler on the north edge and two separate qubit islands in the center joined by a junction or SQUID loaded from another library. Refpoint for a readout line at the opening to the coupler and a modifiable refpoint for a driveline outside of the rectangle.

build()

Child classes re-define this method to build the PCell.

PCell parameters:

• ground_gap (List) - Width, height of the ground gap (µm, µm), default=[700, 700]

• ground_gap_r (Double) - Ground gap rounding radius, default=50, unit=μm

• coupler_extent (List) - Width, height of the coupler (µm, µm), default=[150, 20]

• coupler_r (Double) - Coupler rounding radius, default=10, unit=μm

• coupler_a (Double) - Width of the coupler waveguide center conductor, default=10, unit=μm

• coupler_offset (Double) - Distance from first qubit island to coupler, default=20, unit=μm

• squid_offset (Double) - Offset between SQUID center and qubit center, default=0, unit=μm

• island1_extent (List) - Width, height of the first qubit island (µm, µm), default=[500, 100]

• island1_r (Double) - First qubit island rounding radius, default=50, unit=μm

• island2_extent (List) - Width, height of the second qubit island (µm, µm), default=[500, 100]

• island2_r (Double) - Second qubit island rounding radius, default=50, unit=μm

• drive_position (List) - Coordinate for the drive port (µm, µm), default=[-450, 0]

• island1_taper_width (Double) - First qubit island tapering width on the island side, default=50, unit=µm

• island1_taper_junction_width (Double) - First qubit island tapering width on the junction side, default=10, unit=µm

• island1_taper_height (Double) - First qubit island tapering height, default=10, unit=µm

• island2_taper_width (Double) - Second qubit island tapering width on the island side, default=50, unit=µm

• island2_taper_junction_width (Double) - Second qubit island tapering width on the junction side, default=10, unit=µm

• island2_taper_height (Double) - Second qubit island tapering height, default=10, unit=µm

• junction_type (String) - Junction Type, default=Manhattan Single Junction, choices=['NoSquid', 'Manhattan', 'Manhattan Single Junction', 'Sim']