Psi-ontic model
= Psi-ontic model
{title2=$\psi$-ontic}
An <ontological model of a quantum system> is psi-ontic if distinct <pure states> have mutually singular preparation distributions. The physical state then determines which pure <quantum state> was prepared, almost surely in the pairwise sense. Extra underlying variables may still exist. The <PBR theorem> establishes this conclusion under <preparation independence> and exact quantum predictions.