PIRSA:21100027

Quantum Many-body theory in the Quantum Information era

Fisher, M. (2021). Quantum Many-body theory in the Quantum Information era. Perimeter Institute. https://pirsa.org/21100027

Fisher, Matthew. Quantum Many-body theory in the Quantum Information era. Perimeter Institute, Oct. 18, 2021, https://pirsa.org/21100027 

          @misc{ pirsa_PIRSA:21100027,
            doi = {10.48660/21100027},
            url = {https://pirsa.org/21100027},
            author = {Fisher, Matthew},
            keywords = {Condensed Matter},
            language = {en},
            title = { Quantum Many-body theory in the Quantum Information era},
            publisher = {Perimeter Institute},
            year = {2021},
            month = {oct},
            note = {PIRSA:21100027 see, \url{https://pirsa.org}}
          }

Matthew Fisher University of California, Santa Barbara

DOI 10.48660/21100027
Collection
Talk Type Scientific Series
Subject

Abstract

Traditionally, quantum many-body theory has focussed on ground states and equilibrium properties of spatially extended systems, such as electrons and spins in crystalline solids. In recent years “noisy intermediate scale quantum computers” (NISQ) have emerged, providing new opportunities for controllable non-equilibrium many-body systems. In such dynamical quantum systems the inexorable growth of non-local quantum entanglement is expected, but monitoring (by making projective measurements) can compete against entanglement growth. In this talk I will overview theoretical work exploring the behavior of “monitored” quantum circuits, which can exhibit a novel quantum dynamical phase transition between a weak measurement phase and a quantum Zeno phase, the former which we characterize in detail. Accessing such physics in the lab is challenged by the need for post-selection, which might be circumnavigated by decoding using active error correction, conditioned on the measurement outcomes, as will be described in systems with Z2 symmetry.

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