New to quantum computing? Start here.

Start from zero and read them in order. No algebra: two lessons use small multiplications you could do on paper, and explain each number first.

1. What is quantum computing?7 minWhy quantum computers exist, how they differ from the computer you're using now, and which kinds of problem they might help with.
2. What is a qubit, really?10 minCoins, dimmer switches and why "both at once" is only half the story.
3. Superposition without the hype12 minWhat it means to hold possibilities, and why you never get to see them directly.
4. Entanglement in one coffee11 minTwo qubits that answer together, and what that can and can't do.
5. What quantum computers are good at (and what they aren't)9 minChemistry, materials, factoring and finance. Plus the long list of things they won't speed up.
6. Why qubits are so fragile7 minNoise, error correction, and why one useful qubit may need hundreds of physical ones.
7. How to read a "quantum breakthrough" headline6 minFive questions to ask before you believe the press release, with real examples.

Then: How quantum computers work, 3 lessons on the machine, its gates and its algorithms.

• Quantum and security What a large quantum computer would break, and what replaces it.
• Applications and related technologies What the machines might be good for, and how strong the evidence is.
• Specialist journeys For banking, payments, risk, audit and strategy.