Dresden 2026 – scientific programme

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QI: Fachverband Quanteninformation

QI 9: Decoherence and Open Systems I

QI 9.3: Talk

Tuesday, March 10, 2026, 14:30–14:45, BEY/0245

Emergent decoherent histories from first principles — •Philipp Strasberg — Instituto de Fisica 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: Decoherent histories; Multiverse; pure state statistical mechanics; Many-body systems; Born's rule