title: Experimental violation of the local realism for four-qubit Dicke state.
abstract: Dicke state is an widely used type of multi-particle entangled state in quantum information. However, very few works have been done on its nonlocality. Here we prepare a four-photon symmetric Dicke state, whose fidelity is as high as 0.904 ± 0.004, and devise a simple Bell-type inequality to demonstrate that it violates the local realism with 12 standard deviation.
authors.forename: Yuan-Yuan
authors.initials: YY
authors.lastname: Zhao
authors.forename: Yu-Chun
authors.initials: YC
authors.lastname: Wu
authors.forename: Guo-Yong
authors.initials: GY
authors.lastname: Xiang
authors.forename: Chuan-Feng
authors.initials: CF
authors.lastname: Li
authors.forename: Guang-Can
authors.initials: GC
authors.lastname: Guo