Welcome to QuLTRA’s documentation

QuLTRA is an open-source Python library for the analysis of superconducting circuits that include both lumped elements (capacitors, inductors, Josephson junctions, resistors) and distributed components (such as coplanar waveguides and CPW couplers).

The library provides tools to compute:

-Eigenfrequencies of the circuit modes,

-Dissipation rates, including coupling to external lines,

-The cross-Kerr matrix, describing the nonlinear interactions between modes.

QuLTRA is designed to support fast, layout-independent modeling in the early design stages, before full electromagnetic simulations.

References

QuLTRA Python package, release v1.0.1, archived on Zenodo: https://doi.org/10.5281/zenodo.16897531. The associated research article is in preparation.

Authors

QuLTRA has been developed by Simona Zaccaria and Antonio Gnudi at the University of Bologna, and it is currently maintained by Simona Zaccaria.

Contact

For inquiries or to contribute to the project, please contact Simona at simona.zaccaria4@unibo.it.

You are also welcome to collaborate through the GitHub page by opening issues or submitting pull requests.

Contents:

• Installation
  • Requirements
• Tutorials
  • Basic use of the package
  • Qubit Coupled to a resonator
  • Josepshon Junction array
  • Exploiting higher modes
  • Fast multiplexed superconducting qubit readout with intrinsic Purcell filtering
  • Coupling qubits to the feedline
• Documentation
  • Circuit components
  • Circuit analysis