Fig. 3: The Learned Prediction Experiment under different restrictions.
From: Reply to: Quantum mechanical rules for observed observers and the consistency of quantum theory
Left: If Wigner measures Bob’s lab before Bob produces his prediction (tW < tP), Restriction 18 forbids Alice from applying reasoning rule (C). This restriction ensures that agents do not rely on predictions computed by a malfunctioning agent. (In the FR thought experiment, this requirement is taken care of by the appropriate timing of the protocol steps.) Right: Restriction 29 forbids Alice from applying (C) (as in Fig. 2) even if Wigner measures Bob’s lab after Bob sends his prediction.
