Level 3
Probability Amplitudes
Amplitudes are the signed ingredients of a quantum state; probabilities come from their squared size.
Visualize
The simulator shows probabilities and, for Pro access, the state vector table with amplitudes and phase.
Understand
A 50/50 qubit has equal-size amplitudes for 0 and 1.
Why it matters
Interference depends on amplitude signs and phase, not probabilities alone.
Misconception
Probabilities do not store enough information to predict all later quantum behavior.
Apply
Compare H with H-H and notice how the second H changes the final outcome.
Example DSL
# Hadamard superposition qubits 1 H 0 MEASURE 0
Quick check
Why do amplitudes matter beyond probabilities?