## Video URL

https://pirsa.org/24050057# Universal aspects of decohered and dissipative quantum many-body systems

### APA

Grover, T. (2024). Universal aspects of decohered and dissipative quantum many-body systems. Perimeter Institute for Theoretical Physics. https://pirsa.org/24050057

### MLA

Grover, Tarun. Universal aspects of decohered and dissipative quantum many-body systems. Perimeter Institute for Theoretical Physics, May. 01, 2024, https://pirsa.org/24050057

### BibTex

@misc{ scivideos_PIRSA:24050057, doi = {10.48660/24050057}, url = {https://pirsa.org/24050057}, author = {Grover, Tarun}, keywords = {Other Physics}, language = {en}, title = {Universal aspects of decohered and dissipative quantum many-body systems}, publisher = {Perimeter Institute for Theoretical Physics}, year = {2024}, month = {may}, note = {PIRSA:24050057 see, \url{https://scivideos.org/pirsa/24050057}} }

Tarun Grover University of California, San Diego

**Source Repository**PIRSA

**Collection**

**Talk Type**Scientific Series

**Subject**

## Abstract

Ground states as well as Gibbs states of many-body quantum Hamiltonians have been studied extensively since the inception of quantum mechanics. In contrast, the landscape of many-body quantum states that are not in thermal equilibrium is relatively less explored. In this talk I will discuss some of the recent progress in understanding decohered or dissipative quantum many-body states. One of the key ideas I will employ is that of "separability", i.e., whether a mixed state can be expressed as an ensemble of short-range entangled pure states. I will discuss several quantum phase transitions in topological phases of matter subjected to Markovian environmental noise from a separability viewpoint, and argue that such a framework also subsumes our understanding of pure quantum states as well as Gibbs states. Time permitting, I will also provide a brief overview of quantum spin-systems subjected to non-Markovian noise originating from an electronic bath, and discuss a new critical phase of matter where quantum coherence coexists with dissipation.

References: 2307.13889, 2309.11879, 2310.07286

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