Monte Carlo matrix-product-state approach to the false vacuum decay in the monitored quantum Ising chain

Anno: 2023

Autori: Maki JA., Berti A., Carusotto I., Biella A.

Affiliazione autori: Univ Trento, Pitaevskii BEC Ctr, CNR INO, I-38123 Trento, Italy; Univ Trento, Dipartimento Fis, I-38123 Trento, Italy.

Abstract: In this work we characterize the false vacuum decay in the ferromagnetic quantum Ising chain with a weak longitudinal field subject to continuous monitoring of the local magnetization. Initializing the system in a metastable state, the false vacuum, we study the competition between coherent dynamics, which tends to create resonant bubbles of the true vacuum, and measurements which induce heating and reduce the amount of quantum correlations. To this end we exploit a numerical approach based on the combination of matrix product states with stochastic quantum trajectories which allows for the simulation of the trajectory-resolved non-equilibrium dynamics of interacting many-body systems in the presence of continuous measurements. We show how the presence of measurements affects the false vacuum decay: At short times the departure from the local minimum is accelerated while at long times the system thermalizes to an infinite-temperature incoherent mixture. For large measurement rates the system enters a quantum Zeno regime. The false vacuum decay and the thermalization physics are characterized in terms of the magnetization, connected correlation function, and the trajectory-resolved entanglement entropy.

Giornale/Rivista: SCIPOST PHYSICS

Volume: 15 (4)      Da Pagina: 152-1  A: 152-30

Maggiori informazioni: Funding information We acknowledge financial support from the Provincia Autonoma di Trento.
Parole chiavi: Simulation; Liquids; Field; Fate
DOI: 10.21468/SciPostPhys.15.4.152

Citazioni: 8
dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2025-05-18
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