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Q: Fachverband Quantenoptik und Photonik

Q 35: Quantum States of Light

Q 35.2: Vortrag

Mittwoch, 13. März 2024, 15:00–15:15, HS 3118

Quantum and Classical Information Flow in Phase Space — •Moritz F. Richter and Heinz-Peter Breuer — Institute of Physics, University of Freiburg, Germany

Exchange of information between an open quantum system and its environment, especially the backflow of information to the system associated with quantum notions of non-Markovianity, is a widely discussed topic for years now [1]. Usually the information flow is quantified by the increase of suitable distance measures between two initial states of the open quantum system at hand. However, the same idea can also be used to identify information backflow in classical systems and their dynamics in phase space. In the talk we will address how information backflow of a continuous variable (CV) quantum system can be quantified by means of its phase space representation - i.e. quasi-probability distributions - and how this leads to a notion of non-Markovianity using distance measures between probability distributions representing classical states in phase space [2]. [1] Breuer H-P, Laine E-M, Piilo J and Vacchini B; 2016 "Colloquium: non-Markovian dynamics in open quantum systems"; Rev. Mod. Phys. 88 021002

[2] Richter M F, Wiedemann R and Breuer H-P; 2022 "Witnessing non-Markovianity by quantum quasi- probability distributions"; New J. Phys. 24 123022

Keywords: open quantum systems; quantum non-Markovianity; continouos variable systems; phase space; quantum-to-classical transition