These run in your browser — no install, no signup. Each one is embedded directly in the lesson it belongs to. Here they are in one place.
Drag the slider. The qubit's state shifts continuously between |0⟩ and |1⟩. At θ = 90° you hit perfect superposition — genuinely 50/50, not a metaphor. The Born rule: probability is the square of the amplitude, which is why both bars always sum to exactly 100%.
Full superposition lesson →Quantum algorithms don't brute-force search — they engineer wrong answers to cancel (destructive) while right answers amplify (constructive). Push the phase to 180°. The combined wave vanishes completely. This cancellation is the secret behind every quantum speedup ever discovered.
Full interference lesson →Entangled qubits share a single quantum state that can't be described separately. Measure one — the other instantly "knows" its answer. Not by sending a signal. Just by existing as one correlated whole. Measure again. Always perfectly correlated.
Full entanglement lesson →Every lesson in every track ships with an interactive simulator. Here's a taste of what's coming.