How to Design Flip-Chip Transmon Resonators

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Model Flip-Chip Resonator Geometry

The design requires a three-dimensional flip-chip geometry containing a superconducting transmon and coplanar waveguide (CPW) resonator, with the resonator positioned relative to either an opposing silicon layer or a metal layer. Build the multilayer geometry, define the superconducting materials and excitation ports, and solve the structure with electromagnetic analysis to obtain its resonant response and field distribution. The comparison should keep the resonator design consistent while changing the surrounding layer orientation.

Use frequency-domain electromagnetic simulation to compare the two configurations and inspect changes in resonant behavior produced by the three-dimensional environment. The workflow is simulation-based, so physical measurement instruments are not required for this design-stage analysis. The resulting electromagnetic data can then be evaluated alongside the circuit representation to assess the modeled transmon-resonator structure before fabrication.

Flip-Chip Resonator Design Solution

Model the complete flip-chip stack and compare CPW resonator configurations before fabrication. QuantumPro integrates circuit, layout, electromagnetic (EM) simulation, and quantum analysis within the Advanced Design System workflow. The environment provides QuantumPro 3DEM simulations using finite element method (FEM) and Momentum solvers, allowing the designer to analyze three-dimensional superconducting structures and examine resonant behavior. Automated quantum parameter extraction can be applied to frequency-domain and eigenmode results, while EM-circuit co-simulation supports evaluation of the modeled circuit. This workflow provides a common environment for studying how the surrounding flip-chip geometry affects superconducting qubit and resonator design.

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