Generation of quantum-dot cluster states with superconducting   transmission line resonator
  We propose an efficient method to generate cluster states in spatially separated double quantum dots with a superconducting transmission line resonator (TLR). When the detuning between the double-dot qubits transition frequency and the frequency of the full wave mode in the TLR satisfies some conditions, an Ising-like operator between arbitrary two separated qubits can be achieved. Even including the main noise sources, it's shown that the high fidelity cluster states could be generated in this solid system in just one step. 
Zhi-Rong Lin, Guo-Ping Guo, Tao Tu, Fei-Yun Zhu, and Guang-Can Guo