Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Statut Confirmé
Domaines quant-ph
Date Mercredi 11 Mai 2022
Heure 12:00
Institut LPENS
Salle L367
Nom de l'orateur Girolami
Prenom de l'orateur Davide
Addresse email de l'orateur
Institution de l'orateur Politecnico di Torino
Titre A tale of two bounds: quantum limits to distribution and manipulation of quantum information
Résumé Many-body quantum systems are the most powerful computers allowed by Nature. In this talk, I present two bounds to our ability to process information with them, elucidating their implications. First Part: I discuss universal, quantitative bounds on quantum correlations in many-body systems: they are bounded by the shareable classical information between parts of the system. As an important consequence, objectivity of measurement results arises only when quantum correlations between an information source and a network of recipients are selectively suppressed. That is, consensus among observers responsible for objective classical reality is an emergent attribute of Quantum Mechanics. Refs.: arXiv:2202.09328, PRL128, 010401 (2022) Second part: I introduce a geometric information measure that rigorously evaluates the difference between two complex configurations of arbitrarily large quantum systems, e.g., thousands of interacting atoms. The result is instrumental in finding the maximum conversion rate of physical resources, such as energy and time, into quantum computational power. A simple but universally valid inequality, formally similar to the Heisenberg uncertainty relations, bounds the size of a program that creates a target quantum state by its experimental cost. Ref.: PRL 126, 170502 (2021), PRL122, 010505 (2019), Editors’ Suggestion
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