And these different possibilities can coexist in the wave function as what is called a “superposition” of different states. It’s only when a measurement is carried out that the wave function “collapses” and the system ends up in one definite state. In other words, the cat exists as a wave function (with multiple possibilities) before it’s observed. Christopher Baker , Author providedPhysicists don’t know what a mechanism preventing large-scale quantum superpositions would look like. As for putting a human, or cat, into quantum superposition — there’s really no way for us to know how this would effect that being.