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Quantum Information Processing

Bell inequalities for $$S_4$$ group: classical and quantum bounds for two-orbit case

Katarzyna Bolonek-Lasoń, Piotr Kosiński

Published Jan 2, 2020• 1 citation
Publisher
DOI
10.1007/s11128-019-2557-2

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Bell inequalities for S4S_4S4​ group: classical and quantum bounds for two-orbit case
Bell inequalities for S4S_4S4​ group: classical and quantum bounds for two orbits case
Within Guney-Hillery approach a number of examples of classical and quantum bounds on sum of probabilities resulting from two orbits of S4S_4S4​ is considered. It is shown that the violation of Bell's inequalities is rather rare and gentle.
Violation of Bell inequalities from S4S_4S4​ S 4 symmetry: the three orbits case
The recently proposed (Güney and Hillery in Phys Rev A 90:062121, 2014; Phys Rev A 91:052110, 2015) group theoretical approach to the problem of violating the Bell inequalities is applied to S4S_4S4​ group. The Bell inequalities based on the choice of three orbits in the representation space corresponding to standard representation of S4S_4S4​ are derived and their violation is described. The corresponding nonlocal games are analyzed.
Breaking of Bell inequality based on S4S_4S4​ symmetry
In two recent papers (Phys. Rev. A90 (2014), 062121 and Phys. Rev. A91 (2015), 052110) an interesting method of analyzing the breaking of Bell inequalities has been proposed which is based on the theory of finite group representations. We apply here this method to more complicated example of S4S_4S4​ symmetry. We show how the Bell inequality can be related to the symmetries of regular tetrahedron. By choosing the orbits of threedimensional representation of S4S_4S4​ determined by the geometry of tetrahedron we find that the Bell inequality under consideration is broken in quantum theory. The corresponding nonlocal game is analyzed.