A qubit is a superposition α|0⟩+β|1⟩ (|α|²+|β|²=1). Measuring makes it "collapse" to 0 or 1 with probability |amplitude|². n qubits ↔ 2ⁿ amplitudes — powerful, but only for a few problems (Shor, Grover).
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Apply gates H/X/Z/CNOT to rotate the Bloch arrow · click Measure to collapse the state · pick a "Scenario" (superposition / entanglement / measure) · click a concept for details
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Distribution of measurement results over many runs (histogram)ratio 0ratio 1