  Random tensor network states are toy models for holographic duality, which
have entanglement properties determined by graph geometry. In this paper, we
propose a generalization of the random tensor network states which describe an
ensemble of states preserving a given global symmetry. We show that Renyi
entropy for this family of states can be described by a quantum extremal
surface formula, with corrections to the area law term determined by a bulk
gauge theory wavefunction. This provides a toy model of the correspondence
between boundary global symmetry and bulk gauge symmetry in holographic
duality. We discuss the boundary physical consequences of the bulk deconfined
and confined phases.
