ELFT HÍRADÓ

[Szeminárium koordinátor <sem-admin AT szfki.hu>]

SZFI SeminarKriváchy TamásUniversity of GenevaA neural network oracle for 
quantum nonlocality problems in networksTuesday, 22 September 2020, 10:00, 
video conference, https://letsmeet.wigner.hu/szeminariumCharacterizing 
quantum nonlocality in networks is a challenging, but important problem. 
Using quantum sources one can achieve distributions which are unattainable 
classically. A key point in investigations is to decide whether an observed 
probability distribution can be reproduced using only classical resources. 
This causal inference task is challenging even for simple networks, both 
analytically and using standard numerical techniques. We propose to use 
neural networks as numerical tools to overcome these challenges, by learning 
the classical strategies required to reproduce a distribution. As such, a 
neural network acts as an oracle for an observed behavior, demonstrating that 
it is classical if it can be learned. We apply our method to several examples 
in the triangle configuration. After demonstrating that the method is 
consistent with previously known results, we give solid evidence that a 
quantum distribution recently proposed by Gisin is indeed nonlocal as 
conjectured. Finally we examine the genuinely nonlocal distribution recently 
presented by Renou et al., and, guided by the findings of the neural network, 
conjecture nonlocality in a new range of parameters in these distributions. 
The method allows us to get an estimate on the noise robustness of all 
examined distributions. Minden érdeklődőt szívesen látunk! - Everyone is 
welcome to attend.Róbert Juhászsem-admin AT szfki.hu