paper

Cluster state as a non-invertible symmetry protected topological phase

arXiv:2404.01369 · doi:10.1103/PhysRevLett.133.116601

Abstract

We show that the standard 1+1d cluster model has a non-invertible global symmetry, described by the fusion category Rep(D). Therefore, the cluster state is not only a symmetry protected topological (SPT) phase, but also a non-invertible SPT phase. We further find two new commuting Pauli Hamiltonians for the other two Rep(D) SPT phases on a tensor product Hilbert space of qubits, matching the classification in field theory and mathematics. We identify the edge modes and the local projective algebras at the interfaces between these non-invertible SPT phases. Finally, we show that there does not exist a symmetric entangler that maps between these distinct SPT states.

19 pages, 1 figure, 3 tables; v2: minor changes; v3: minor changes

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