Quantum 2025 – wissenschaftliches Programm

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MON: Monday Contributed Sessions

MON 19: Foundational / Mathematical Aspects – Quantum Optics and Quantum Information

MON 19.3: Vortrag

Montag, 8. September 2025, 17:00–17:15, ZHG008

Causal influences in quantum many-body systems — •Leonardo Silva Vieira Santos and Otfried Gühne — Universität Siegen

In this contribution, I will present a quantum information-theoretic framework for consistently formulating cause-and-effect in quantum many-body systems. We define an operational measure of quantum causal influence, which quantifies how information and correlations propagate through the system. This reveals a causal interpretation of the 2nd law of thermodynamics, arising from the monogamy of entanglement and thus with no counterpart in classical physics. Finally, we show how causality constrains quantum dynamics and can be used to infer properties of many-body Hamiltonians, formulating a ``converse Lieb-Robinson problem''.

Keywords: Quantum many-body systems; Quantum causality; Lieb-Robinson bound