Statut  Confirmé 
Série  FORUMENS 
Domaines  quantph 
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  Manybody 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 manybody 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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