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_22020068,
            doi = {},
            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 Type Scientific Series


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