How to Design Superconducting Qubit Circuits

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photonics
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photonics
+ QuantumPro

Design and Analyze Qubit Layouts

A superconducting qubit design starts with a circuit containing transmon qubits, coplanar waveguide (CPW) transmission lines, meander-line resonators, and supporting passive elements. The design is translated into a physical layout using quantum circuit components, with launch structures available as excitation ports for electromagnetic analysis. The layout is then represented as three-dimensional geometry for full-wave analysis.

The electromagnetic workflow evaluates the frequency response of the circuit and provides information about its resonant modes. In the demonstrated four-qubit example, the analysis uses the designed qubit and resonator network to examine whether the intended resonant behavior is achieved under the low-power approximation used for the quantum regime. The completed layout can then be exported in Graphic Database System (GDS) format for fabrication.

Superconducting Qubit Design Solution

Start with the superconducting qubit circuit topology and translate the schematic into a physical layout containing transmon structures, coplanar waveguide lines, meander-line resonators, and excitation structures. The design flow then converts the layout into three-dimensional geometry for electromagnetic analysis and examines the resulting frequency response and resonant modes. The application note demonstrates this process with a four-transmon, four-resonator circuit and concludes with GDS export for fabrication. The current QuantumPro environment aligns with this design flow by integrating circuit/layout design and electromagnetic analysis for superconducting qubits, with frequency-domain and eigenmode simulation capabilities and automated quantum-parameter extraction.
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