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QI: Fachverband Quanteninformation

QI 2: Quantum Foundations

QI 2.7: Talk

Monday, March 6, 2023, 12:30–12:45, B302

Causality and signalling in a quantum information space-time — •Leonardo Silva Vieira Santos — Universitat Siegen, Siegen, Germany

In recent years, there has been a growing interest and effort in understanding causality in the quantum domain. Much of this is due to the tension between the two most successful scientific theories of modern physics: quantum mechanics and Einstein's general relativity. On the one hand, quantum mechanics is a probabilistic theory whose application typically takes place in contexts with a fixed and well-defined causal structure. General relativity, on the other hand, is deterministic but has a dynamical causal structure. We propose a framework to study space-time causal structures from the point of view of quantum information theory. In our approach, the causal constrains of a space-time determines the possible deterministic transformations between states of quantum systems called quantum causal probes. As a result, we demonstrate how well-known processes with indefinite causal order and indefinite time direction emerge from the formalism.