Out-of-time-ordered correlation functions in open systems

Zapraszamy w piątek  24.04.2020 o godz. 14:00 na seminarium.

Seminarium ONLINE pod tytułem: "Out-of-time-ordered correlation functions in open systems" poprowadzi Jan Tuziemski, Stockholm University

Abstract: 

Recent theoretical and experimental studies have shown significance of quantum information scrambling for problems encountered in high-energy physics, quantum information, and condensed matter. Due to complexity of quantum many-body systems it is plausible that new developments in this field will be achieved by experimental explorations. Therefore, a better theoretical understanding of quantum information scrambling in systems affected by noise is needed. To address this problem I will discuss indicators of quantum scrambling - out-of-time-ordered correlation functions (OTOCs) in open quantum systems. As most experimental protocols for measuring OTOCs are based on backward time evolution, two possible scenarios of joint system-environment dynamics reversal will be considered. Derivation of general formulas for OTOCs in those cases as well as a study of the spin chain model coupled to the environment of harmonic oscillators will be presented.