Exploring the limits of no backwards in time signalling

Yelena Guryanova, Ralph F Silva, A J Short, Paul Skrzypczyk, Nicolas Brunner, Sandu Popescu

Research output: Contribution to journalArticle (Academic Journal)peer-review

4 Citations (Scopus)
104 Downloads (Pure)


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.
Original languageEnglish
Article number211
Number of pages24
Publication statusPublished - 9 Dec 2019

Structured keywords

  • Bristol Quantum Information Institute
  • QITG


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