Quantum Physics in Action
Move beyond theoretical paradoxes to see how quantum mechanics actually powers your smartphone, the internet, and the future of computing.
Like Duolingo, but for Quantum Physics in Action. Tomo turns the whole topic into a game you play five minutes a day, until it actually sticks.
A short one: 12 levels across 2 sections, about 24 minutes end to end, roughly 5 days at five minutes a day. It moves through Quantum Tech in Your Pocket and The Logic of the Very Small. It assumes you already know the basics.
Free forever · No credit card · iPhone & Android

Key ideas in Quantum Physics in Action
- Electrons need a specific energy boost to jump from the valence to the conduction band
- Doping introduces impurities to shift the material's Fermi level
- Insulators have large gaps that thermal energy alone cannot bridge
- P-type doping creates positive 'holes' that act as mobile charge carriers
- Semiconductors have narrow gaps that allow controlled switching
- N-type doping provides surplus electrons for conduction
- How band gap size determines a material's electrical behavior
- The mechanism of doping to create charge carriers
- Electrons and holes recombine at the interface to create a neutral barrier
- Tunneling allows particles to cross barriers they lack the energy to climb
- The depletion region prevents further flow without external voltage
- The probability of tunneling depends on the thickness of the barrier
- Forward bias shrinks the barrier while reverse bias widens it
- Trapped electrons on the gate represent a binary state (0 or 1)
- The formation and function of a P-N junction
- The application of quantum tunneling in non-volatile memory
You've tried the other tabs
Thirty open tabs. Four facts you actually kept.
You watched. You nodded. By Sunday it was gone.
One answer, then back to scrolling.
Eight weeks. You meant to finish. You didn't.
Tomo gives Quantum Physics in Action the Duolingo treatment: levels, streaks, and quick quizzes that test what you just learned. That game loop is what the tabs above never had, so it's the one you actually finish.
Here's what playing it feels like
A real question from this course. Take your best guess.
What is the primary purpose of 'doping' a pure semiconductor crystal?
Get it right to open this lesson and 11 more in the app.
How to learn Quantum Physics in Action, step by step
Go in order. 12 short levels across 2 sections, about 24 minutes in all, five minutes a day.
- 1
Quantum Tech in Your Pocket
- The Semiconductor Revolution
- Lasers: Light in Lockstep
- 2
The Logic of the Very Small
- Computing with Superposition
- Entanglement and Secure Secrets
2 sections · 4 units · 12 levels. Built to play, not to enroll.
Questions about Quantum Physics in Action
How do I learn Quantum Physics in Action?
Go in order: start with Quantum Tech in Your Pocket, then The Logic of the Very Small. On Tomo that's 12 short levels, about 24 minutes in all, played five minutes a day. Start free and play the first level in under a minute.
Is there a Duolingo-style app for Quantum Physics in Action?
Yes. Tomo works like Duolingo: short daily lessons, streaks and quick quizzes. Quantum Physics in Action is one of its free courses, and you can type any other topic to get a course of your own.
Is the Quantum Physics in Action course free?
Yes. Quantum Physics in Action is playable on Tomo's free plan, which doesn't expire. No credit card, no waitlist. Download the app and start your first lesson.
How long does it take to learn Quantum Physics in Action?
12 levels across 2 sections, about 24 minutes of play in total. It's built for five minutes a day, so you finish it a little at a time instead of all at once.
Do I need any background to start Quantum Physics in Action?
No. It's pitched at an intermediate level, so it starts where you are and builds up. If you can tap a phone, you can start.
Tomo is in ChatGPT
Tomo is also a ChatGPT plugin: the same playable courses, built and played inside your chat.
Add Tomo to ChatGPT- What to ask
- “Make me a Tomo course on black holes.” “Turn this chat into a Tomo course.”
- What you get
- Quick questions with instant feedback, hearts and stars, ready to play in about a minute.
- Where it goes
- No sign-up to start. Connect your Tomo account and your streak carries on in the app.
You pick the voice
Quantum Physics in Action is taught in the Professor style: clear, structured, thorough. Want a different feel? In the app you can spin up the same topic in any of Tomo's teaching styles. Same facts, totally different vibe.
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Quantum Physics in Action
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Start Quantum Physics in Action today.
Download Tomo, search Quantum Physics in Action, and play your first lesson in under a minute.