Bonn 2025 – scientific programme

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QI: Fachverband Quanteninformation

QI 39: Quantum Foundations

QI 39.4: Talk

Friday, March 14, 2025, 11:45–12:00, HS VIII

Causal structure of quantum black-boxes — •Leonardo Silva Vieira Santos — Universität Siegen

The relationship between causality and quantum measurements is central to many of the foundational challenges in quantum theory. Key examples of this tension include Bell’s theorem, the concept of "impossible measurements" in quantum field theory, and the "multi-agent paradoxes," such as Wigner’s friend and its generalizations. In this work, we systematically explore how causality constrains the implementation of quantum operations and the insights it offers. We introduce a framework for causal modeling in quantum operations, deriving a range of results, including the connection between commutation and factorization (Tsirelson’s problem) and information causality.

Keywords: Bell's nonlocality; Quantum measurements; Quantum causality; Quantum entanglement