Quantum Computing
From qubits and superposition to real algorithms — build a working mental model of quantum computation.
In this track · 10 lessons
Foundations
3 lessons- 1From bits to qubits~12 minInteractiveA classical bit is 0 or 1. A qubit can be both at once — in superposition. That single change is where all of quantum computing begins.
- 2Measurement — why you only ever see 0 or 1~11 minInteractiveA qubit holds a rich continuous state, yet measuring it always yields a plain 0 or 1 — and destroys the superposition. This collapse is quantum computing's central constraint.
- 3Entanglement — the spooky one~12 minInteractiveTwo qubits can share a single state so that measuring one instantly determines the other. Entanglement is the resource that makes quantum computing more than parallel coin-flipping.
Core
3 lessons- 4Quantum gates and circuits~14 minInteractiveYou compute on qubits by applying quantum gates arranged into circuits — the quantum version of logic gates, but reversible and able to act on superpositions.
- 5Interference — the real engine~13 minInteractiveSuperposition alone is just parallel coin-flipping. Quantum speedups come from interference: arranging amplitudes so wrong answers cancel and right answers reinforce.
- 6Grover's search — a first real algorithm~14 minInteractiveGrover's algorithm finds a marked item in an unsorted list of N in about √N steps instead of N — a concrete, intuitive example of interference doing real work.
Advanced
2 lessons- 7Shor's algorithm and the threat to cryptography~14 minInteractiveShor's algorithm factors large numbers exponentially faster than any known classical method — which would break the public-key cryptography the internet relies on. Here's why, and what's being done.
- 8The noise problem and error correction~14 minInteractiveQubits are astonishingly fragile — the tiniest disturbance destroys their state. Quantum error correction fights back, but at a steep cost that defines the whole field's timeline.
Expert
2 lessons- 9Building a real quantum computer~13 minThere's no single way to make a qubit. Superconducting circuits, trapped ions and photons each embody one, with different strengths — and all of today's machines live in the noisy "NISQ" era.
- 10What quantum computing will (and won't) do~13 minQuantum computers aren't faster classical computers. They win on specific, structured problems — and knowing which ones separates realistic expectation from hype.
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