To measure this state superposition, we can, for example, measure the effect of a wave on a quantum object. At a specific wave frequency, the material progressively shifts from one state to another, and that is detected by Rabi oscillations. The superposition is a purely quantum property, but it is a flimsy one : as soon as the superposed quantum object interacts with its environment, whether it is atoms, light or heat, the superposition will stop after a short while, and this phase is called decoherence. The more important the interaction, the shorter the phase. The Rabi oscillations then fades away.