Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Status Confirmed
Seminar Series SEM-EXCEP
Subjects cond-mat
Date Thursday 18 January 2024
Time 14:00
Institute LPTMC
Seminar Room LPTMC seminar room, Jussieu, towers 12-13, 5th floor, room 523
Speaker's Last Name Frérot
Speaker's First Name Irénée
Speaker's Email Address
Speaker's Institution LKB
Title From Bell's inequalities to statistical physics models (and back)
Abstract John Bell's celebrated inequalities (BI) constrain the « hidden-variable models » that Einstein had first envisioned to possibly complete the statistical predictions of quantum physics. The violation of BI by quantum-mechanical predictions imply that the latter are « non-local ». Most experiments have long focused on violating textbook BI, involving a pair of two-level quantum systems. Yet, more recently, the investigation of BI in a many-body context has blossomed, motivated both by the fundamental understanding of the quantum / classical boundary when the complexity of the system increases ; as well as by the certification of genuine non-classical properties, such as quantum entanglement, in quantum-technology hardwares. In this talk, we first explain that Bell's local-hidden-variable models are nothing more than classical statistical physics models (namely, generalizations of Ising models). We use this insight to construct new algorithms, inspired by so-called inverse statistical problems in data science, that infer previously-unknown BI from correlation functions as measured in quantum many-body experiments. These new BI are then analized to gain insight in the manifestations of many-body entanglement, and in the certification of quantum properties.
arXiv Preprint Number

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