Experimental preparation of eight-partite linear and two-diamond shape   cluster states for photonic qumodes
  The preparation of multipartite entangled states is the prerequisite for exploring quantum information networks and quantum computation. In this letter, we present the first experimental demonstration of eight-partite spatially separated CV entangled states. The initial resource quantum states are eight squeezed states of light, through the linearly optical transformation of which two types of the eight-partite cluster entangled states are prepared, respectively. The generated eight entangled photonic qumodes are spatially separated, which provide valuable quantum resources to implement more complicated quantum information task. 
Xiaolong Su, Yaping Zhao, Shuhong Hao, Xiaojun Jia, Changde Xie, and   Kunchi Peng
quant-ph