Reading about qubits only gets you so far. These five builds make you apply the ideas from the modules: you'll generate true random numbers from superposition, create an entangled Bell state, search with Grover's algorithm, find a molecule's ground state with VQE, and simulate BB84 quantum key distribution.
Each project follows along with a video walkthrough, and most run on a free Qiskit simulator, so no quantum hardware is needed. Work through them in order, or jump to the one that matches the module you just finished.
Put qubits into superposition with Hadamard gates and measure them to produce truly random bits, then turn those bits into a number.
Combine a Hadamard and a CNOT gate to entangle two qubits, then run the circuit and read the correlated results from a histogram.
Build an oracle and a diffuser in Qiskit, find a marked item in an unsorted search space, and compare simulator results with real hardware.
Use a parameterized circuit and a classical optimizer to estimate the lowest energy of a small molecule with the Variational Quantum Eigensolver.
Model Alice and Bob sharing a secret key, then add an eavesdropper and watch the error rate reveal the interception.