HQMM symmetry actions are classified by H^2(G, U(1)) 2-cocycles and reproduce SPT properties for the AKLT chain via projective hidden-layer representations.
Journal of Mathematical Physics64, 041903 (2023)
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Cocycle Actions on Hidden Quantum Markov Models: Symmetry Protection and Topological Order
HQMM symmetry actions are classified by H^2(G, U(1)) 2-cocycles and reproduce SPT properties for the AKLT chain via projective hidden-layer representations.