  The ability to create large highly entangled `cluster' states is crucial for
measurement-based quantum computing. We show that deterministic multi-photon
entanglement can be created from coupled solid state quantum emitters without
the need for any two-qubit gates and regardless of whether the emitters are
identical. In particular, we present a general method for controlled
entanglement creation by making direct use of the always-on exchange
interaction, in combination with single-qubit operations. This is used to
provide a recipe for the generation of two-dimensional, cluster-state entangled
photons that can be carried out with existing experimental capabilities in
quantum dots.
