中文摘要：

实验研究了Bell不等式、Mermin不等式和Svetlichny不等式在GHZ态中对定域实在论结果的破坏．采用目标态密度矩阵的方法给出了实验制备的GHZ态的保真度，得到了三个不等式在GHZ态中的测量值．实验结果表明，三个Bell型不等式在同一个状态下对定域实在论结果破坏程度不同，在量子密钥分配中可以选择合适的非定域性描述方式考察所用信道的安全性．

英文摘要：

We investigate experimentally the violation of the Bell, Mermin and Svetlichny inequalities to local realism prediction. Using the maximum-likelihood technique to construct the density matrix and calculate the fidelity of the Greenberger-Horne-Zeilinger （GHZ） state. The values of the three inequalities are measured. The experimental resuls show that the three inequalities have different violation degrees to local realism prediction. So we can choose a suitable method of nonlocality to estimate the security of quantum channel.