Bloch Lab
Learning path

Learn quantum computing, one picture at a time.

Short lessons in order. Each starts with a two-sentence answer and lets you play with the idea in 3D.

  1. 01What is a qubit?How a qubit differs from a bit, and what “a bit of 0 and a bit of 1” really means.→
  2. 02The Bloch sphereEvery qubit state is a point on a sphere. Read latitude as probability and longitude as phase.→
  3. 03MeasurementWhy looking at a qubit changes it, and why you need many runs to see the full picture.→
  4. 04Quantum gatesX, Y, Z, Hadamard, S and T — each one is simply a rotation of the sphere.→
  5. 05Multiple qubitsWhy two qubits need four numbers, and how the CNOT gate links them.Soon
  6. 06EntanglementBell pairs, and why an entangled qubit has no arrow of its own.Soon
  7. 07InterferenceHow amplitudes cancel and add up — the trick behind every quantum algorithm.Soon