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

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. The talk will be based on the paper: J. Tuziemski, Phys. Rev. A 100, 062106 (2019) ______________________________________________ Zoom meeting details Topic: Quantum Information and Quantum Computing Working Group Time: May 21, 2020, 04:00 PM Warsaw Join Zoom Meeting: QIQCWG-ZOOM Meeting ID: 640 279 690Password: tp4C,kERx If you encounter any problems with connecting to the Zoom meeting, please email filip.b.maciejewski@gmail.com directly.