Séminaires : Séminaire d'Algèbres d'Opérateurs

Equipe(s) : ao,
Responsables :Pierre Fima, François Le Maître, Romain Tessera
Email des responsables :
Salle : 2015
Adresse :Sophie Germain
Description

Orateur(s) Thomas Vidick - Caltech,
Titre MIP* = RE
Date26/11/2020
Horaire14:00 à 15:00
Diffusion https://bigbluebutton3.imj-prg.fr/b/fra-j6k-9fw
RésumeMIP* and RE are complexity classes, similar but larger to the more well-known P, NP, etc. The equality in the title implies that a natural optimization problem that originates in the study of nonlocality in quantum mechanics is undecidable. Due to prior work by many others this undecidability implies a negative answer to multiple conjectures in quantum information (Tsirelson's problem) and operator algebras (Connes' Embedding Problem (CEP), Kirchberg's QWEP). In the talk I will explain the characterization MIP* = RE and its connection to the study of nonlocality, Tsirelson's problem, and operator algebras. I will give an overview of the proof of MIP* = RE, which involves reducing the Halting Problem to the problem of approximating the supremum of a linear function on certain quantum correlation sets. Based on joint work with Ji, Natarajan, Wright and Yuen available as arXiv:2001.04383.
Salle2015
AdresseSophie Germain
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