  We introduce plaquette projected entangled-pair states, a class of states in
a lattice that can be generated by applying sequential unitaries acting on
plaquettes of overlapping regions. They satisfy area-law entanglement, possess
long-range correlations, and naturally generalize other relevant classes of
tensor network states. We identify a subclass that can be more efficiently
prepared in a radial fashion and that contains the family of isometric tensor
network states [M. P. Zaletel and F. Pollmann, Phys. Rev. Lett. 124, 037201
(2020)]. We also show how this subclass can be efficiently prepared using an
array of photon sources.
