Quantum Measurement Postulate: Before measurement, a particle exists in superposition
ψ = Σ cₙφₙ where {φₙ} are energy eigenstates. The Born Rule states that the probability of measuring
eigenvalue Eₙ is |cₙ|². Upon measurement, the wavefunction collapses instantaneously to the eigenstate
φₙ — all other probability amplitude vanishes. This non-unitary collapse is the central mystery of quantum mechanics.
Click "Measure!" repeatedly to see the Born Rule statistics emerge from many trials.