Quantum computing, visualized
See a qubit think.
Bloch Lab explains quantum computing with interactive 3D. Rotate a real qubit, apply quantum gates and watch measurement happen — no math background needed to start.
- Free, no account
- Interactive 3D
- Beginner friendly
The Bloch sphereDrag to rotate
State|ψ⟩ = |0⟩θ = 0° · φ = 0°
P(0)100%
P(1)0%
|0⟩
your circuit appears here
Start: the qubit is in |0⟩
The arrow points at the north pole, so measuring now gives 0 every time. Press a gate to rotate it, or drag the sphere to look around.
Learning path
From one qubit to entanglement, step by step.
Seven short lessons. Each one opens with a plain answer, then lets you play with the idea in 3D.
01What is a qubit?How a qubit differs from a bit, and what “a bit of 0 and a bit of 1” really means.02The Bloch sphereEvery qubit state is a point on a sphere. Read latitude as probability and longitude as phase.03MeasurementWhy looking at a qubit changes it, and why you need many runs to see the full picture.04Quantum gatesX, Y, Z, Hadamard, S and T — each one is simply a rotation of the sphere.
05Multiple qubitsWhy two qubits need four numbers, and how the CNOT gate links them.Coming soon
06EntanglementBell pairs, and why an entangled qubit has no arrow of its own.Coming soon
07InterferenceHow amplitudes cancel and add up — the trick behind every quantum algorithm.Coming soon
ThenBuild your own circuits →Put everything together in the Playground.How it works
Every lesson works the same way.
1
Read the short answer
Each page starts with a plain two-sentence explanation. No jargon until you need it.
2
See it move in 3D
Interactive scenes show what the formula is actually doing. Every symbol is explained in words.
3
Try it yourself
Play with the gates right inside the lesson, then experiment freely in the Playground.
Glossary