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Author

Daniel Gromada

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Preprint Aug 2026

Complex Hadamard Matrices - Quantum Symmetries, Equivalence and Non-Local Games

We consider quantum group generalizations of the action of monomial matrices on complex Hadamard matrices. This gives rise to various notions of quantum symmetries and quantum equivalences of Hadamard matrices. We show that if one acts by a certain largest monomial quantum group, then all Hadamard matrices of a given s...

Michael Brannan, Daniel Gromada, Roberto Hernández Palomares et al. · 0 citations

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