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• W4294069204 abstract "The capacity of distant parties to send signals to one another is a fundamental requirement in many information-processing tasks. 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 -- in contrast to the case of causal connection -- 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." @default.
• W4294069204 created "2022-09-01" @default.
• W4294069204 creator A5010035758 @default.
• W4294069204 creator A5015332631 @default.
• W4294069204 creator A5058573636 @default.
• W4294069204 date "2022-08-25" @default.
• W4294069204 modified "2023-10-01" @default.
• W4294069204 title "Resource theory of causal connection" @default.
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• W4294069204 doi "https://doi.org/10.22331/q-2022-08-25-788" @default.
• W4294069204 hasPublicationYear "2022" @default.
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