In quantum mechanics, a particle can exist in multiple states at once—this is called superposition. For example, an electron can be in both "spin up" (|Up⟩) and "spin down" (|Down⟩) simultaneously, with certain probabilities. The spinning particle above represents this mix of states. Adjust the slider to change the probability of measuring |Up⟩. When you click "Measure!", the superposition collapses to one state, just like in a real quantum experiment.
Current State: Superposition