Status  Confirmed 
Seminar Series  SEMEXCEP 
Subjects  condmat 
Date  Thursday 18 January 2024 
Time  14:00 
Institute  LPTMC 
Seminar Room  LPTMC seminar room, Jussieu, towers 1213, 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 « hiddenvariable models » that Einstein had first envisioned to possibly complete the statistical predictions of quantum physics. The violation of BI by quantummechanical predictions imply that the latter are « nonlocal ». Most experiments have long focused on violating textbook BI, involving a pair of twolevel quantum systems. Yet, more recently, the investigation of BI in a manybody 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 nonclassical properties, such as quantum entanglement, in quantumtechnology hardwares. In this talk, we first explain that Bell's localhiddenvariable models are nothing more than classical statistical physics models (namely, generalizations of Ising models). We use this insight to construct new algorithms, inspired by socalled inverse statistical problems in data science, that infer previouslyunknown BI from correlation functions as measured in quantum manybody experiments. These new BI are then analized to gain insight in the manifestations of manybody entanglement, and in the certification of quantum properties. 
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