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Physik-Preis- Dresden: Probing the Quantum Mechanics of Many-Body Chaos

date
15.01.2019 
time
05:00 PM - 06:30 PM 
speaker
Prof. Dr. Klaus Richter 
affiliation
University Regensburg 
language
en 
main topic
Physics: Theoretical Physics
abstract

The dynamics and spread of quantum information in complex many-body systems is presently attracting a lot of attention across various fields, ranging from cold atom physics via condensed quantum matter to high energy physics and quantum gravity. This includes questions of how a quantum system thermalizes and phenomena like many-body interference and localization, more generally non-classicality in many-particle quantum physics. Here concepts related to the famous spin echo that are based on rewinding time provide a useful way to monitor complex quantum dynamics and its stability. Central to these developments are so-called out-of-time-order correlators (OTOCs). They presently receive particular attention as sensitive probes for chaos and the temporal growth of complexity in interacting systems. We will address such phenomena using semiclassical path intergral techniques based on interfering Feynman paths, thereby bridging the classical and quantum many-body world. This enables us to compute echoes and OTOCs and interprete the results in terms of multi-particle interference, thereby including entanglement and correlation effects. Moreover, on the numerical side we devise a semiclassical method for Bose-Hubbard systems far-out-of equilibrium that allows us to calculate quantum interference effects on time scales far beyond the famous Ehrenfest/scrambling time.

 

Last update: 15.01.2019 00:07.

venue 

Max-Planck-Institut für Physik komplexer Systeme (Seminarroom 1+2) 
Nöthnitzer Straße 38
01187 Dresden
telefon
+ 49 (0)351 871 0 
e-mail
Max-Planck-Institut für Physik komplexer Systeme 
homepage
http://www.mpipks-dresden.mpg.de 

organizer 

Max-Planck-Institut für Physik komplexer Systeme (MPI-PKS)
Nöthnitzer Straße 38
01187 Dresden
telefon
+ 49 (0)351 871 0 
e-mail
Max-Planck-Institut für Physik komplexer Systeme (MPI-PKS) 
homepage
http://www.mpipks-dresden.mpg.de 
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