Add double pad qubit simulation sample

[Copilot]

Adds simulation sample for double pad transmon qubits with ports on both pads, following the pattern established in simulate_resonator.py.

Implementation

• New file: qpdk/samples/simulate_double_pad_qubit.py
  • Uses double_pad_transmon component as the DUT
  • Exposes left_pad_port and right_pad_port for two-port S-parameter measurements
  • Includes SIM_AREA layer for simulation boundary definition
  • Omits probeline launchers per requirements

Usage

from qpdk.samples.simulate_double_pad_qubit import double_pad_qubit_simulation

# Default: 250x400μm pads, 15μm gap
c = double_pad_qubit_simulation()

# Custom geometry
c = double_pad_qubit_simulation(pad_size=(300.0, 500.0), pad_gap=20.0)

Configuration

• Frequency sweep: 0.1-8 GHz (typical transmon range)
• Dual-port simulation mode (only_one_port=False)
• STL export enabled for 3D EM solvers
• Automatically registered in test suite via existing infrastructure

Original prompt

Create a double pads qubit simulation sample similar to that of qpdk/samples/simulate_resonator.py. You don't need to add a probeline but add simulation ports to both of the double pads.

---

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.