Runs entirely in your browser — nothing to install
Quantum computing, finally intuitive.
Drag gates onto wires. Watch amplitudes interfere, Bloch spheres spin, and entanglement emerge — live, as you build. Then read the six short lessons that explain why it all works.
Free forever · Save your circuits with an account
bell_state.qc — the “hello world” of quantum
Two gates. Two qubits that will now agree forever. Try it →
Build
A click-and-drag circuit workbench with 14 gates, up to 5 qubits, and instant re-simulation on every change.
Open workbench →See
Probability bars, exact amplitudes with phase dials, and a Bloch sphere per qubit that shrinks when entanglement appears.
See entanglement →Train
A quantum machine-learning lab: watch a variational classifier learn XOR, circles, and moons with real parameter-shift gradients.
Open the ML Lab →Understand
Six lessons from “what is a qubit” to Grover's search — each wired directly into a live circuit you can modify.
Browse lessons →Famous circuits, one click away
Each loads with a plain-English explanationThe six-lesson path
1What is a qubit? — The quantum bit: like a coin that can be heads, tails, or a precise blend of both.6 min2Superposition & the Hadamard gate — How one gate turns certainty into a perfect quantum coin flip — and why that's not randomness.7 min3The gate zoo — X, Y, Z, phase gates and rotations — every gate is just a rotation of the Bloch sphere.8 min4Entanglement & Bell states — Two qubits that share a single fate — the phenomenon Einstein called 'spooky'.8 min5Measurement & probability — Why looking changes everything, and what 1024 shots on real hardware actually mean.6 min6Famous circuits: Grover & teleportation — Two small circuits with big ideas: searching faster than brute force, and moving states without moving matter.9 min
Ready to flip your first quantum coin?
It takes one Hadamard gate and about ten seconds.