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Qubit
16
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See what to study next
The coach reads your progress and picks the next step
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Run a circuit
Open the simulator and execute gates (5 qubits free, up to 16 on paid plans)
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A timed paper with a pass mark and a certificate at the end
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The full course: foundations and advanced tracks
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Every interactive simulation in one place
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Puzzles that ask you to build a target state
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Your circuit library, stored in this browser
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Your learning statistics, computed locally
Lessons
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What Is a Qubit?
A bit is a switch. A qubit is a direction. Getting that difference straight is most of the battle.
Beginner
Visualizations
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The Bloch Sphere
Every possible state of a single qubit, as one point on a globe you can spin.
Beginner
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Entanglement
Two qubits whose answers always match — without either one carrying the answer.
Intermediate
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