



01309nas a2200157   4500008004100000245007300041210006900114260001400183300000800197490000600205520083900211100002001050700002501070700001901095856003701114       2022                        eng d00aUnlimited non-causal correlations and their relation to non-locality0 aUnlimited noncausal correlations and their relation to nonlocali  c3/22/2022  a6730 v63 a<p>Non-causal correlations certify the lack of a definite causal order among localized space-time regions. In stark contrast to scenarios where a single region influences its own causal past, some processes that distribute non-causal correlations satisfy a series of natural desiderata: logical consistency, linear and reversible dynamics, and computational tameness. Here, we present such processes among arbitrary many regions where each region influences every other but itself, and show that the above desiderata are altogether insufficient to limit the amount of &quot;acausality&quot; of non-causal correlations. This leaves open the identification of a principle that forbids non-causal correlations. Our results exhibit qualitative and quantitative parallels with the non-local correlations due to Ardehali and Svetlichny.</p>1 aBaumeler, Ämin1 aGilani, Amin, Shiraz1 aRashid, Jibran  uhttps://arxiv.org/abs/2104.06234