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research article

Almost synchronous quantum correlations

Vidick, Thomas  orcid-logo
February 1, 2022
Journal of Mathematical Physics

The study of quantum correlation sets initiated by Tsirelson in the 1980s and originally motivated by questions in the foundations of quantum mechanics has more recently been tied to questions in quantum cryptography, complexity theory, operator space theory, group theory, and more. Synchronous correlation sets introduced by Paulsen et al. [J. Funct. Anal. 270, 2188-2222 (2016)] are a subclass of correlations that has proven particularly useful to study and arises naturally in applications. We show that any correlation that is almost synchronous, in a natural ℓ1 sense, arises from a state and measurement operators that are well-approximated by a convex combination of projective measurements on a maximally entangled state. This extends a result of Paulsen et al. [J. Funct. Anal. 270, 2188-2222 (2016)] that applies to exactly synchronous correlations. Crucially, the quality of approximation is independent of the dimension of the Hilbert spaces or of the size of the correlation. Our result allows one to reduce the analysis of many classes of nonlocal games, including rigidity properties, to the case of strategies using maximally entangled states that are generally easier to manipulate.

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Type
research article
DOI
10.1063/5.0056512
Scopus ID

2-s2.0-85124379221

Author(s)
Vidick, Thomas  orcid-logo

California Institute of Technology

Date Issued

2022-02-01

Published in
Journal of Mathematical Physics
Volume

63

Issue

2

Article Number

022201

Editorial or Peer reviewed

REVIEWED

Written at

OTHER

EPFL units
Non-EPFL  
FunderFunding(s)Grant NumberGrant URL

NSF Physics Frontiers Center

PHY-1125565

NSF

1125565,CCF-1553477

AFOSR

FA9550-16-1-0495

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Available on Infoscience
November 13, 2025
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/255834
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