Quantum no-signalling bicorrelations

Michael Brannan, Samuel J. Harris, Ivan G. Todorov, Lyudmila Turowska

Research output: Contribution to journalArticlepeer-review

Abstract

We introduce classical and quantum no-signalling bicorrelations and characterise the different types thereof in terms of states on operator system tensor products, exhibiting connections with bistochastic operator matrices and with dilations of quantum magic squares. We define concurrent bicorrelations as a quantum input-output generalisation of bisynchronous correlations. We show that concurrent bicorrelations of quantum commuting type correspond to tracial states on the universal C*-algebra of the projective free unitary quantum group, showing that in the quantum input-output setup, quantum permutations of finite sets must be replaced by quantum automorphisms of matrix algebras. We apply our results to study the quantum graph isomorphism game, describing the game C*-algebra in this case, and make precise connections with the algebraic notions of quantum graph isomorphism, existing presently in the literature.

Original languageEnglish (US)
Article number109732
JournalAdvances in Mathematics
Volume449
DOIs
StatePublished - Jul 2024

Keywords

  • Entanglement
  • Non-local games
  • Operator system
  • Quantum graphs

ASJC Scopus subject areas

  • General Mathematics

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