Universal aspects of decohered and dissipative quantum many-body systems

          @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/index.php/pirsa/24050057}}
          }
          

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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