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QI: Fachverband Quanteninformation

QI 28: Decoherence and Open Quantum Systems (joint session QI/Q)

QI 28.2: Vortrag

Donnerstag, 13. März 2025, 11:30–11:45, HS II

Emergent decoherent histories from first principles — •Philipp Strasberg — Instituto de Física de Cantabria (IFCA), Santander, Spain

I overview recent progress about the emergence of decoherent histories from first principles, i.e., without the use of ensembles or approximations to the Schroedinger dynamics --- akin to approaches in pure state statistical mechanics. After briefly reviewing the importance of decoherent histories to understand a unitarily evolving quantum Universe, I show that generic (non-integrable) many-body systems are characterized by an exponential suppression of interference effects (as a function of the particle number of the system) whereas integrable systems are characterized by a much weaker form of decoherence. I conclude with an outlook about how (long) (de/re)coherent histories shape the structure of the Multiverse, a hitherto unappreciated phenomenon.

Keywords: Decoherence; Many-body systems; pure state statistical mechanics; decoherent histories; Multiverse