3/29/2024 0 Comments Superluminal signalling![]() Our intuitive understanding of correlations between events relies on the concept of causal influences, either relating directly the events, such as the position of the moon causing the tides, or involving a past common cause, such as seeing a flash and hearing the thunder when a lightning strikes. Our result uncovers a new aspect of the complex relationship between multipartite quantum non-locality and the impossibility of signalling.Ĭorrelations cry out for explanation 1. Hence, assuming the impossibility of using non-local correlations for superluminal communication, we exclude any possible explanation of quantum correlations in terms of influences propagating at any finite speed. ![]() This superluminal communication does not require access to any hidden physical quantities, but only the manipulation of measurement devices at the level of our present-day description of quantum experiments. Here, we show that for any finite speed v with, such models predict correlations that can be exploited for faster-than-light communication. Yet, any such experimental violation could always be explained in principle through models based on hidden influences propagating at a finite speed v> c, provided v is large enough 3, 4. The experimental violation of Bell inequalities using space-like separated measurements precludes the explanation of quantum correlations through causal influences propagating at subluminal speed 1, 2.
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