Qualifies· moderateZW-E016
PBR 2012: the wavefunction-as-ordinary-ignorance route is constrained
- what the source states
- Any model in which the quantum state represents mere information about an underlying physical state, with independently prepared systems having independent physical states, "must make predictions which contradict those of quantum theory."
- what we infer
- Closes an escape route on both sides: the physicalist cannot cheaply deflate the wavefunction into ignorance about ordinary hidden matter, and the idealist cannot claim the theorem as support — it assumes an underlying physical ontic state, exactly what strong idealism denies, so it constrains a neighbour of both positions rather than either principal.
- limitations
- Rests on the preparation-independence assumption, which ψ-epistemic loyalists contest.