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About

One family, one idea: quantum computing is more fun hands-on

Fun with Quantum is the front door to a family of open-source quantum outreach projects that grew over years of talks, workshops, and conference booths: quantum games you play in the browser, quantum computer models you 3D-print or build from LEGO, and hands-on ways to learn and teach. Everything is open source and tested on real audiences, from school classes to IEEE conferences.

The family is built by Jan-R. Lahmann and the RasQberry community. Contributions are welcome in every repository — start at github.com/JanLahmann. Questions, ideas and bug reports: open an issue in the Fun-with-Quantum repository.

Privacy

This site has no accounts, no sign-up and no cookies. The browser games run entirely in your browser; nothing you do in them is sent anywhere, apart from the anonymous counts below and the questions you choose to ask Ket.

  • Page counts. We count page views and a few named clicks (for example a notebook launch or a finished game round) with Umami, a cookieless analytics service. Umami sets no cookies and does not identify you; it records the page, the site you came from, and coarse facts such as browser, operating system, device type, language and country.
  • Ket, the AI helper. Under some games you can ask questions in a chat (“Ask Ket”); Ket as the guide on some pages of this site, and Ket on rasqberry.org, work the same way and send the page you are on instead of a game state. Ket is an AI, not a person. Only when you send a question, it goes together with the visible game state (chapter, moves, score), the earlier questions and answers of the chat, the explanation level you picked (in a game) and the page language through our server at Cloudflare to Anthropic, whose Claude model writes the answer (see Anthropic's privacy policy). We store the question, the answer, the game state and your thumbs up or down for 30 days to improve Ket, then delete them. We store no IP address and no cookie with them; to limit requests, the server counts questions per day under a pseudonym derived from your IP address that changes every day. The level you pick (Kids, Normal, With math) is remembered only in your own browser. Please don't enter personal data.
  • The iPhone and iPad app. The Fun with Quantum app (in test, through Apple's TestFlight) has no account, no cookies and no tracking. The games and 3D models run on your device, also offline; links open in Safari, where the linked site's own privacy policy applies. Like this site, the app counts anonymously with Umami which screens and games are used (the screen or page, game events such as a finished round, and device type, system, language and country), without identifying you; offline, nothing is counted. Ket in the app works as described above. So that only the app can ask, it proves it is genuine with Apple's App Attest: the server keeps that key (its ID and public key, which say nothing about you) until 30 days after its last use and counts the questions per key per day; to limit new keys, it counts them per day under a pseudonym of your IP address that changes every day. If you test the app through TestFlight, Apple collects crash logs, usage information and the feedback you send and shares them with us; if you joined through the public link, Apple doesn't show us your name or email address (see Apple's TestFlight & Privacy).
  • Hosting. The site is served by GitHub Pages; GitHub processes your IP address to deliver it (see GitHub's privacy statement).
  • Other sites. The 3D model on the homepage loads its viewer from cdn.jsdelivr.net and the model from quantego.org. Notebook buttons open QuBins or mybinder.org, and other links lead to the family's own sites and to IBM — each with its own privacy policy.