Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Statut Confirmé
Domaines cond-mat
Date Mercredi 3 Avril 2024
Heure 12:45
Institut LPENS
Salle 3 Rue d’Ulm
Nom de l'orateur Cao
Prenom de l'orateur Xiangyu
Addresse email de l'orateur
Institution de l'orateur LPENS
Titre Phase transitions from detectors to scramblers
Résumé A quantum measurement apparatus (a detector) is an ambivalent object, existing at the quantum-classical boundary: It transforms quantum information into classical objective knowledge that is accessible to many observers. Meanwhile, generic isolated many-body systems are expected to scramble information, making it practically inaccessible. In this talk I will discuss toy models exhibiting sharp transitions between the two behaviours. The models take the general form of quantum dynamics on an expanding lattice — akin to the mutliscale entanglement renormalisation Ansatz (MERA), or field theory on de Sitter spacetime — which generates scale invariant states. We show that an “encoding-revealing" transition takes place when the dimension of the lightest (non-identity) operator crosses the threshold d/2, d being the space dimension. We argue that the transition is accompanied by the appearance of non-Gaussian statistics. Based on the publications Phys. Rev. Lett. 132, 110201 (2024) Phys. Rev. A 109, 032226 (2024) and ongoing work.
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