标题： 对Werner态更有效的贝尔不等式 显示英文标题

标题： More efficient Bell inequalities for Werner states

摘要： 在本文中，我们研究了由可见性参数 0<p<1 参数化的两个量子比特 Wenter 状态的非局域性质。构建了一种新的贝尔不等式家族，这些不等式证明了在参数范围 0.7056<p<1 内，两个量子比特 Wenter 状态是非局域的。这比对应于 Clauser-Horne-Shimony-Holt (CHSH) 不等式违反的范围 0.7071<p<1 稍微宽一些。这正面回答了 Gisin 提出的问题，即存在比 CHSH 不等式更有效的贝尔不等式，因为它们被更广泛的两个量子比特 Wenter 状态所违反。 显示英文摘要

摘要： In this paper we study the nonlocal properties of two-qubit Werner states parameterized by the visibility parameter 0<p<1. New family of Bell inequalities are constructed which prove the two-qubit Werner states to be nonlocal for the parameter range 0.7056<p<1. This is slightly wider than the range 0.7071<p<1, corresponding to the violation of the Clauser-Horne-Shimony-Holt (CHSH) inequality. This answers a question posed by Gisin in the positive, i.e., there exist Bell inequalities which are more efficient than the CHSH inequality in the sense that they are violated by a wider range of two-qubit Werner states.