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.
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AKLT ground state is represented as the observable process of a causal HQMM, endowing it with hidden quantum memory consistent with its MPS description.
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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.
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AKLT State is Indeed the Observation Process of a causal Hidden quantum Markov Model
AKLT ground state is represented as the observable process of a causal HQMM, endowing it with hidden quantum memory consistent with its MPS description.