Workshop »Interplay of quantum information, foundations and gravity« Mitschnitt einer Veranstaltung des Institute for Quantum Optics and Quantum Information (IQOQI) am Freitag, dem 1. Juni 2018 im Theatersaal der Österreichischen Akademie der Wissenschaften Teil 23: Philippe Allard Guérin: Observer-dependent locality of quantum events Kamera und Schnitt: Daniel Winkler Philippe Allard Guérin ist Doktorand am Institut für Quantenoptik, Quantennanophysik und Quanteninformation in Wien. Abstract: The process matrix formalism was invented to describe multipartite quantum correlations, without requiring the assumption of a preexisting causal order. Certain correlations contained within the formalism are incompatible with the assumption of a causal ordering of the events –these correlations violate causal inequalities. However, the formalism offers no clue as to how one might physically realize such acausal correlations. We attempt to understand these processes in a more physical way by making an explicit connection with certain aspects of the relativistic description of causality. We associate to each event a "causal reference frame", which can be interpreted as an observer dependent time function, and relate the reference frames of different events via a consistency condition. We then show how these ideas occur concretely by discussing some examples of interesting non-causal processes. INHALT ====== Kapitel Titel Position --------------------------------------------------------------------- 1. Vorspann 00:00:00 2. Events and causal reference frames 00:00:08 3. Equivalence with pure process matrix formalism 00:21:02 4. Case study of strongly non-causal processes 00:28:13 5. A gravitational thought experiment revisited 00:41:50 6. Questions from the audience 00:48:00

Quantenphysik, Kausalität

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(c) Österreichische Zentralbibliothek für Physik