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Such ability is determined by the causal structure connecting the parties, and more generally, by the intermediate processes carrying signals from one laboratory to another. Here we build a fully fledged resource theory of causal connection for all multi-party communication scenarios, encompassing those where the parties operate in a definite causal order and also where the order is indefinite. We define and characterize the set of free processes and three different sets of free transformations thereof, resulting in three distinct resource theories of causal connection. In the causally ordered setting, we identify the most resourceful processes in the bipartite and tripartite scenarios. In the general setting, instead, our results suggest that there is no global most valuable resource. We establish the signalling robustness as a resource monotone of causal connection and provide tight bounds on it for many pertinent sets of processes. Finally, we introduce a resource theory of causal non-separability, and show that it is \u2013 in contrast to the case of causal connection \u2013 unique. Together our results offer a flexible and comprehensive framework to quantify and transform general quantum processes, as well as insights into their multi-layered causal connection structures.<\/jats:p>","DOI":"10.22331\/q-2022-08-25-788","type":"journal-article","created":{"date-parts":[[2022,8,25]],"date-time":"2022-08-25T11:59:10Z","timestamp":1661428750000},"page":"788","update-policy":"https:\/\/doi.org\/10.22331\/q-crossmark-policy-page","source":"Crossref","is-referenced-by-count":24,"title":["Resource theory of causal connection"],"prefix":"10.22331","volume":"6","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6987-5513","authenticated-orcid":false,"given":"Simon","family":"Milz","sequence":"first","affiliation":[{"name":"Institute for Quantum Optics and Quantum Information, Austrian Academy of Sciences, Boltzmanngasse 3, 1090 Vienna, Austria"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4823-0353","authenticated-orcid":false,"given":"Jessica","family":"Bavaresco","sequence":"additional","affiliation":[{"name":"Institute for Quantum Optics and Quantum Information, Austrian Academy of Sciences, Boltzmanngasse 3, 1090 Vienna, Austria"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1339-0656","authenticated-orcid":false,"given":"Giulio","family":"Chiribella","sequence":"additional","affiliation":[{"name":"QICI Quantum Information and Computation Initiative, Department of Computer Science, The University of Hong Kong, Pokfulam Road, Hong Kong"},{"name":"Department of Computer Science, University of Oxford, Wolfson Building, 15 Parks Road, Oxford OX1 3QD, United Kingdom"},{"name":"Perimeter Institute for Theoretical Physics, 31 Caroline St North, Waterloo, ON N2L 2Y5, Canada"}]}],"member":"9598","published-online":{"date-parts":[[2022,8,25]]},"reference":[{"key":"0","unstructured":"M. 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