Communication between spin qubits with microwave photons

We consider possibilities of quantum state transfer between spin qubits (e.g. electrons in quantum dots) utilizing a microwave transmission line and a tunable coupler. We outline the possibility for optimal quantum transfer between qubit nodes depending on qubit-resonator coupling strengths and tunability, and in the presence of imperfections. Implications of such systems to practical quantum computing in silicon and/or GaAs quantum dots are considered.