Exploring the limits of no backwards in time signalling

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

doi:10.22331/q-2019-12-09-211

Exploring the limits of no backwards in time signalling

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

School of Physics

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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 language	English
Article number	211
Number of pages	24
Journal	Quantum
Volume	3
DOIs	https://doi.org/10.22331/q-2019-12-09-211
Publication status	Published - 9 Dec 2019

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Bristol Quantum Information Institute
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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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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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AU - Silva, Ralph F

AU - Short, A J

AU - Skrzypczyk, Paul

AU - Brunner, Nicolas

AU - Popescu, Sandu

PY - 2019/12/9

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N2 - 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.

AB - 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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DO - 10.22331/q-2019-12-09-211

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JO - Quantum

JF - Quantum

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Exploring the limits of no backwards in time signalling

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