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We describe a quantum circuit that produces a highly entangled state of Nqubits from which one can efficiently compute expectation values of localobservables. This construction yields a variational ansatz for quantummany-body states that can be regarded as a generalization of the multi-scaleentanglement renormalization ansatz (MERA), and to which we refer as thebranching MERA. In a lattice system in D dimensions, the scaling ofentanglement of a region of size L^D in the branching MERA is not subject torestrictions such as a boundary law L^{D-1}, but can be proportional to thesize of the region, as we demonstrate numerically for D=1,2 dimensions.

A class of highly entangled many-body states that can be efficiently simulated