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Status |
Confirmed |
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Seminar Series |
LPTMS |
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Subjects |
cond-mat.stat-mech |
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Date |
Tuesday 25 April 2023 |
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Time |
11:00 |
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Institute |
LPTMS |
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Seminar Room |
Salle des séminaires du FAST et du LPTMS, bâtiment Pascal n°530 |
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Speaker's Last Name |
Schiro' |
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Speaker's First Name |
Marco |
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Speaker's Email Address |
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Speaker's Institution |
College de France |
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Title |
Quantum Measurements, Entanglement and Stochastic Resettingv |
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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. |
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arXiv Preprint Number |
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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/ |
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Attachments |
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