Knowledge of Quantum Hidden Variables Enables Backwards-In-Time Signaling

Bell’s theorem implies that any completion of quantum mechanics which uses hidden variables (that is, preexisting values all observables) must be nonlocal in the Einstein sense. This customarily indicates knowledge would permit superluminal communication. Such signaling, akin to existence a preferred reference frame, is expected. However, here we provide protocol allows an observer with communicate her own causal past, without signaling. That such contradict causality, irrespectively validity relativity theory. Among ways propose for bypassing paradox there possibility change their even when state does not, and means signaling backwards time prohibited Bohmian mechanics.