Acknowledgments

This textbook exists because of the conviction that a world-class quantum mechanics education should be available to everyone, regardless of geography, institutional affiliation, or economic circumstance. That conviction is shared by a vast community of educators, scientists, programmers, and students who have contributed — directly and indirectly — to making this resource possible.

The Open-Source Community

This book was built on the shoulders of the open-source ecosystem. Every simulation in these pages runs on freely available tools created and maintained by dedicated volunteers and contributors worldwide:

  • Python — the language that has democratized scientific computing and made computational quantum mechanics accessible to undergraduates
  • NumPy and SciPy — the numerical backbone of every calculation in this book, from matrix diagonalization to differential equation solvers
  • Matplotlib — every plot, every visualization, every probability density rendered across these chapters
  • QuTiP (Quantum Toolbox in Python) — the remarkable library that puts research-grade quantum simulation tools in the hands of students
  • SymPy — symbolic computation that lets students verify their algebra and explore analytic solutions
  • Jupyter — the notebook environment that makes computational physics interactive and explorable
  • mdBook — the publishing system that transforms these source files into a readable, navigable textbook

To the thousands of contributors who build and maintain these tools: your work has changed how physics is taught. This book is a testament to what the open-source model makes possible.

A Community-Developed Resource

This textbook is not the product of a single author working in isolation. It is a living document, developed and refined through the contributions of a community that believes in open education. Every error report filed, every explanation improved, every exercise refined has made this a better resource for the next student who opens it.

We owe a particular debt to:

  • The instructors who pilot-tested early drafts, sent detailed feedback, and refused to let unclear explanations stand
  • The students whose questions revealed where the exposition failed them — every "I don't understand this part" made the next version clearer
  • The researchers who reviewed technical content for accuracy, especially in the rapidly evolving fields of quantum information and quantum technologies
  • The translators working to make this material accessible in languages beyond English

An Invitation

This book is never finished. If you find an error — whether a typo, a sign mistake in a derivation, a misleading explanation, or a broken code example — we want to hear about it. If you have a better way to explain a concept, a more illuminating exercise, or an updated reference, we welcome your contribution.

If you are an instructor using this book in your course, we especially value your experience. Which chapters worked well? Where did students struggle? What would you add or change? Your insights directly shape future editions.

Open education works because people contribute. We hope you will be one of them.

Dedication

To every student who has stared at a quantum mechanics problem at 2 a.m. and wondered whether the universe is really that strange:

Yes. It is. And it is worth understanding.