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ReadMe:

This is an early draft of a community resource document on superconducting qubit design and engineering. We created this open-source hoping to grow this into a living document which evolves with the field through feedback and contribution.

What you see today is a bare-bones version of the document which may have typos, inaccuracies, incomplete sections, or missing references. This project started as a shared notes document among a few graduate students/postdocs from different institutions, but we realized that our model of working across institutions and managing writing/reviewing could be extended to the broader superconducting circuit community.

On the path towards building the quantum computer, we believe the superconducting circuits community could benefit from a consolidated resource which covers the enormous size of the field without compromising on key details or rigor. This task only seems possible as a community effort.

To see other successful open-source projects like this, see:

The Stacks Project

Dive into Deep Learning

Error Correction Zoo

We are currently requesting feedback and contributions to this community resource for superconducting qubit design, engineering, and control.

How to contribute:

• Feedback: This can be pointing out typos/inaccuracies, requests for more detail on a topic, requests for more topics, requests for exercises, etc. We’re happy to hear from you! Use this form to share comments.
• Contribute: Help us in expanding this resource by writing more sections, preparing exercises, how-to-guides, adding and organizing references, etc. There are many ways to help, and we welcome your ideas for how to contribute. Use this form to indicate that you’d like to be a contributor, and we’ll reach out and co-ordinate getting you access.
• Review: We invite senior members in the field across academia and industry to help us keep this resource accurate and up-to-date. Use this form to indicate that you’d like to be a reviewer, and we’ll reach out and co-ordinate getting you access.

Timeline of the Project

● Sep 2024

Sara Sussman began teaching qubit design classes (Fall/Winter).

● Dec 2025

Tilly Schaaf, Shishir Sudhaman & Arjun Ghosh started a shared notebook on Notion from Sara's notes.

● Jun 16, 2026

First draft of the open-source qubit design notes made public to contributors.

Future Directions

• Streamlining Contributions/Reviews : We currently work with Notion as it’s easy to typeset equations, add images, and access as a website. As more contributors join the project, we will use more scalable methods of version control and reviewing.
• Website: We aim to build a website that accommodates the shape of this resource which may include multi-media content, interactive exercises, graph-based navigation of the content, etc.
• More Content: We want this resource to be ready for use as soon as possible and that means we need a lot more content.
• Your Ideas: This project is still in its early stages, so it’s very malleable! We’d love to hear from you! </aside>

Preface: Global Perspective and Context

Chapters:

CHAPTER 1: An Electrical Circuit as an Artificial Atom

CHAPTER 2: Canonical Quantization of the Hamiltonian

CHAPTER 3: Cavity into Circuit QED

CHAPTER 4: The Physics of the Josephson Junction

CHAPTER 5: The Transmon Hamiltonian

Appendices:

Appendix: Superconductivity Context

Appendix: Fabrication of Josephson Junctions

We have provided the references that we have used so far, but we are aware that there are many more great references available. To look at the complete list, synced from our Zotero Library, see:

References