The course map

Three tracks, three depths, and the order to read them in. Every page here teaches its idea three times over, so you choose how far down to go.

Three depths, on every page

An analogy, no equations, no unexplained jargon. If you can follow a good magazine article, you can follow this.

The real terms and light arithmetic: ratios, exponents, a formula you can plug numbers into.

The actual formalism, with worked examples that are computed and checked, and the papers behind them.

Pick a depth at the top of any page and the site remembers it. The glossary lists every term with the depth it is taught at.

Read it in this order; each step uses the one before.

Start here: two minutes and zero equations. Why the field’s two hardest problems fit together.
What is a qubit made of?: the physical circuit underneath everything else.
Quantum mechanics versus computing: which parts of the theory the machine actually uses. Includes a Bloch sphere you can rotate.
Error correction and the logical qubit: how noisy hardware becomes trustworthy, and why the field counts logical qubits.
Why the algorithms work: one mechanism behind Grover’s and Shor’s.
Will quantum boost AI? and Can it break Bitcoin?: the two loudest claims, with the numbers.
How the companies compare: five structural trade-offs behind the leaderboard.
Where might it earn its keep? and Sensors and networks: what quantum technology is for, and what already ships.
The Machinery: the mathematics underneath, topic by topic, with every claim proved or marked as not.

The field hiding behind every “quantum will transform logistics” headline, and the honest test of that claim.

Can a classical machine out-optimise a quantum one?: an Ising machine you can race.
The Feasible Region: a course in operations research, from linear programming and duality through network flow, game theory and reinforcement learning, with games and a verdict on one named quantum-advantage claim.

For anyone who has to decide what to do about the locks, not just understand them.

Post-quantum cryptography, on the wire: seven tools that run on real keys with no signup, from a one-paste check to running the new standards yourself.

Want the story first? A history of quantum computing, with sources runs from Planck in 1900 to error rates that fall as machines grow, one cited paper per milestone.

Prefer a map? The Descent lays the whole site out as a dilution refrigerator, colder is deeper, as a picture, a 3D model or a list.

Movie scenes, myths and viral claims, rated against the physics.

Every tracked claim, scored when its deadline lands, with our own misses beside theirs.

Games where the mathematics holds the whistle, or the story campaign around them.

Every term, with the page that explains it.

Press / anywhere to search the whole site, or ? for the keyboard shortcuts.