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Exploring the limits of no backwards in time signalling

Research output: Contribution to journalArticle

Original languageEnglish
Article number211
Number of pages24
JournalQuantum
Volume3
DOIs
DateAccepted/In press - 25 Nov 2019
DatePublished (current) - 9 Dec 2019

Abstract

We present an operational and model-independent framework to investigate the concept of no-backwards-in-time signalling. We define no-backwards-in-time signalling conditions, closely related to the spatial no-signalling conditions. These allow for theoretical possibilities in which the future affects the past, nevertheless without signalling backwards in time. This is analogous to non-local but no-signalling spatial correlations. Furthermore, our results shed new light on situations with indefinite causal structure and their connection to quantum theory.

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    Rights statement: This is the final published version of the article (version of record). It first appeared online via Verein zur Förderung des Open Access Publizierens in den Quantenwissenschaften at https://quantum-journal.org/papers/q-2019-12-09-211/. Please refer to any applicable terms of use of the publisher.

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