标题： 多部分量子态违反贝尔型不等式的上限 显示英文标题

标题： Upper bounds on violation of Bell-type inequalities by a multipartite quantum state

摘要： 我们给出了广义N-qubit GHZ态、N-qudit GHZ态以及一般任意N-partite量子态（可能为无限维）的最大Bell违抗的新精确上界。 我们的结果表明，对于希尔伯特空间维度任意的N-partite量子态，任何具有S个设置且每个站点有任意数量结果的Bell型不等式（无论是关于相关函数还是联合概率）的违反都不能超过(2S-1)^{N-1}。 显示英文摘要

摘要： We present the new exact upper bounds on the maximal Bell violation for the generalized N-qubit GHZ state, the N-qudit GHZ state and, in general, for an arbitrary N-partite quantum state, possibly infinite-dimensional. Our results indicate that, for an N-partite quantum state of any Hilbert space dimension, violation of any Bell-type inequality (either on correlation functions or on joint probabilities) with S settings and any number of outcomes at each site cannot exceed (2S-1)^{N-1}.