Special QM Seminar Speaker Daniel Ranard (Stanford) Wednesday, December 2 at 10:00 am

Time/Venue Wednesday, December 2, at 10:00 am Pacific Time via this Zoom link
Host Michael Zaletel
Title Emergent classicality in the dynamics of large systems
Abstract In a quantum measurement process, classical information about the measured system spreads through the environment. In contrast, quantum information about the system becomes inaccessible to local observers. In this talk, I will present a result about quantum channels indicating that an aspect of this phenomenon is completely general. We show that for any evolution of the system and environment, for everywhere in the environment excluding an O(1)-sized region we call the “quantum Markov blanket,” any locally accessible information about the system must be approximately classical, i.e. obtainable from some fixed measurement. The result strengthens the earlier result of arXiv:1310.8640, allowing applications to understanding and simulating many-body systems.
Based on: arXiv:2001.01507 with Xiao-Liang Qi

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