PIRSA:22020068

Measurement-induced criticality and charge-sharpening transitions

Vasseur, R. (2022). Measurement-induced criticality and charge-sharpening transitions. Perimeter Institute. https://pirsa.org/22020068

Vasseur, Romain. Measurement-induced criticality and charge-sharpening transitions. Perimeter Institute, Feb. 14, 2022, https://pirsa.org/22020068 

          @misc{ pirsa_PIRSA:22020068,
            doi = {10.48660/22020068},
            url = {https://pirsa.org/22020068},
            author = {Vasseur, Romain},
            keywords = {Condensed Matter},
            language = {en},
            title = {Measurement-induced criticality and charge-sharpening transitions},
            publisher = {Perimeter Institute},
            year = {2022},
            month = {feb},
            note = {PIRSA:22020068 see, \url{https://pirsa.org}}
          }

Romain Vasseur

University of Massachusetts Amherst

Talk number
PIRSA:22020068
Collection
Talk Type
Subject
Abstract

Monitored quantum circuits (MRCs) exhibit a measurement-induced phase transition between area-law and volume-law entanglement scaling. In this talk, I will argue that MRCs with a conserved charge additionally exhibit two distinct volume-law entangled phases that cannot be characterized by equilibrium notions of symmetry-breaking or topological order, but rather by the non-equilibrium dynamics and steady-state distribution of charge fluctuations. These include a charge-fuzzy phase in which charge information is rapidly scrambled leading to slowly decaying spatial fluctuations of charge in the steady state, and a charge-sharp phase in which measurements collapse quantum fluctuations of charge without destroying the volume-law entanglement of neutral degrees of freedom. I will present some statistical mechanics and effective field theory approaches to such charge-sharpening transitions.

Zoom Link: https://pitp.zoom.us/meeting/register/tJcqc-ihqzMvHdW-YBm7mYd_XP9Amhypv5vO