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Copenhagen
We meet on Wednesdays from 15:15 to 16:15. If you have any questions about the seminar or want to be added to the email list, please contact one of the organizers:
Antoine Golsborough: asg@math.ku.dk
Ian Thompson: ian@math.ku.dk
Ryo Toyota: ryo.toyota@math.ku.dk
20/10/2026, Vibenshuset
Lyudmila Turowska (Chalmers University of Technology)
This is a joint seminar with QMath. Please note: the seminar will take place on a Tuesday at 13:00-14:00 in Vibenshuset.
Title: Cantor Correlations and Isomorphism of Cantor Graphs
Abstract: Parallel repetition plays a central role in the study of asymptotic values of non-local games and in distinguishing classical and quantum models, with important applications to device-independent cryptography. Extending a game to countably many repetitions naturally leads to games over Cantor spaces, where inputs and outputs are infinite strings and successive rounds need not be independent or identical. This framework provides a flexible setting for studying non-local games with memory and infinite outcome sets.
In this talk, I will introduce no-signalling Cantor correlations as strategies for such games, with a particular focus on bisynchronous graded correlations. While finite bisynchronous correlations are characterized by traces on quantum permutation groups, their Cantor analogues are related to infinite free wreath products of quantum permutation groups. As an application, I will discuss an operational notion of isomorphism for Cantor graphs and explain its connection to the quantum isomorphism of certain locally finite level graphs in the sense of Rollier and Vaes.
25/11/2026, TBA
Antoine Goldsborough (University of Copenhagen)
Title: TBA
Abstract: TBA
02/12/2026, TBA
Kang Li (Lund University)
Title: TBA
Abstract: TBA
09/12/2026, TBA
Tobias Fritz (University of Innsbruck)
Title: TBA
Abstract: TBA
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