Status | Confirmed |
Seminar Series | LPTMS |
Subjects | cond-mat.stat-mech |
Date | Tuesday 25 April 2023 |
Time | 11:00 |
Institute | LPTMS |
Seminar Room | Salle des séminaires du FAST et du LPTMS, bâtiment Pascal n°530 |
Speaker's Last Name | Schiro' |
Speaker's First Name | Marco |
Speaker's Email Address | |
Speaker's Institution | College de France |
Title | Quantum Measurements, Entanglement and Stochastic Resettingv |
Abstract | I will discuss the problem of a quantum many-body system evolving under its own Hamiltonian and subject to local weak quantum measurements. The resulting quantum many-body trajectories evolve according to a stochastic Schrodinger equation. Averaging the wave function over the realisations of the stochastic process gives rise to a mixed state evolution for the system density matrix whic leads to heating and featureless steady states. However, hidden in the random fluctuations of the measurement process there is a much richer physics - with new dynamical phases characterised by qualitatively different entanglement properties and sharp phase transitions between them - which has started to be explored only very recently. I will discuss this measurement-induced criticality in the context of a Quantum Ising Chain, which I will show to display a transition from a critical phase with logarithmic scaling of the entanglement entropy to an area-law phase corresponding to the onset of the Quantum Zeno Effect. I will interpret these results using a phenomenological quasiparticle picture for entanglement dynamics in monitored systems based on stochastic resetting. |
arXiv Preprint Number | |
Comments | Hybrid: onsite + zoom. For zoom info, please write to valentina.ros@universite-paris-saclay.fr or check http://lptms.u-psud.fr/en/activites/seminaires/ |
Attachments |
To Generate a poster for this seminar : [ Postscript | PDF ]
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[ English version ] |