Quantum space-time marginal problem: global causal structure from local causal information

• URL: http://arxiv.org/abs/2303.12819v2
• Date: Fri, 21 Jul 2023 08:43:23 GMT
• Title: Quantum space-time marginal problem: global causal structure from local causal information
• Authors: Zhian Jia, Minjeong Song, Dagomir Kaszlikowski
• Abstract summary: We study the relationship between local causal information and global causal structure. A space-time marginal problem is proposed to infer global causal structures. We show that there almost always exists a solution in this case.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Spatial and temporal quantum correlations can be unified in the framework of the pseudo-density operators, and quantum causality between the involved events in an experiment is encoded in the corresponding pseudo-density operator. We study the relationship between local causal information and global causal structure. A space-time marginal problem is proposed to infer global causal structures from given marginal causal structures where causal structures are represented by the pseudo-density operators; we show that there almost always exists a solution in this case. By imposing the corresponding constraints on this solution set, we could obtain the required solutions for special classes of marginal problems, like a positive semidefinite marginal problem, separable marginal problem, etc. We introduce a space-time entropy and propose a method to determine the global causal structure based on the maximum entropy principle, which can be solved effectively by using a neural network. The notion of quantum pseudo-channel is also introduced and we demonstrate that the quantum pseudo-channel marginal problem can be solved by transforming it into a pseudo-density operator marginal problem via the channel-state duality.

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