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

Carmy, Avishy; Cohen, Eliahu; Maccone, Lorenzo; Nikolić, Hrvoje (2021) Knowledge of Quantum Hidden Variables Enables Backwards-In-Time Signaling. Applied Sciences-Basel, 11 . ISSN 2076-3417

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Abstract

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

Item Type: Article
Uncontrolled Keywords: causality ; contextuality ; hidden variables
Subjects: NATURAL SCIENCES > Physics
Divisions: Theoretical Physics Division
Depositing User: Hrvoje Nikolić
Date Deposited: 27 May 2021 12:35
Last Modified: 10 Aug 2021 10:22
URI: http://fulir.irb.hr/id/eprint/6418
DOI: 10.3390/app11104477

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