Exploring the limits of no backwards in time signalling

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

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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.
Original languageEnglish
Article number211
Number of pages24
JournalQuantum
Volume3
DOIs
Publication statusPublished - 9 Dec 2019

Structured keywords

  • Bristol Quantum Information Institute
  • QITG

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