Quantum Foundations

From classical bits to qubits, superposition, measurement and the Bloch sphere.

7 lessons25 exercises78 min

1. 01Why quantum computing?What kind of problems a quantum computer is for, and what it is not.10 min
2. 02Bits, qubits and notationKets, amplitudes and how a register of qubits is written down.12 min
3. 03Superposition and the Hadamard gateWhere superpositions come from, what phase is, and why H twice does nothing.12 min
4. 04MeasurementWhat a measurement does to a state, why shots matter and how to read a histogram.10 min
5. 05Quantum Coin Game & InterferenceWhy two Hadamards are not two coin flips: amplitudes add and cancel like waves.10 min
6. 06The Bloch sphereOne qubit as a point on a sphere: angles, rotations and what entanglement does to the picture.12 min
7. 07Multi-Qubit Registers & SeparabilityRead |q1 q0⟩ labels the Qiskit way, build joint states with ⊗, and tell separable from entangled at a glance.12 min