Constructing Local Symmetric Operator Algebras via Reflection Positivity

Abstract: We establish a framework with reflection positivity as the first principle for constructing the boundary theory of topologically ordered quantum spin systems. Assuming reflection positivity, we prove the equivalence between the non-degeneracy of the ground state on the sphere and the local-indistinguishability of local ground states of a frustration-free Hamiltonian. We apply the Osterwalder-Schrader (OS) reconstruction to construct the local symmetric operator algebras, which characterize the emergent categorical symmetry in the ground states.