= Preparation independence
{title2=$\mu_{\psi_1,\ldots,\psi_n}=\bigotimes_i\mu_{\psi_i}$}
Independently operated <quantum state preparations> are assumed to produce independent underlying physical states. Their joint preparation measure factors into the single-system measures. This ontic factorization is an additional assumption, not a consequence of operational independence alone. It turns a common single-system overlap of mass $\varepsilon$ into a common $n$-system overlap of mass $\varepsilon^n$ in the <PBR theorem>.
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