标题： 可分量子态的关联性不会比局域实在论更强。 关于Z. Chen的quant-ph/0611126的一篇评论 显示英文标题

标题： Separable quantum states do not have stronger correlations than local realism. A comment on quant-ph/0611126 of Z. Chen

摘要： 陈（quant-ph/0611126）最近声称“可分态的‘指数级’违背局域实在性”，意思是多部分可分量子态应该会产生违反贝尔型不等式的关联和涨落，而陈认为局域实在性满足所有贝尔型不等式。 然而，这是不可能成立的，因为可分量子态的所有预测（包括所有关联和涨落）都有局域实在论的描述，并因此满足所有的贝尔型不等式，这一点对于任意数量的参与者都成立。 由于陈通过提出一个新的不等式（声称是贝尔型的），认为可分态可以违背该不等式，因此其论证必然存在缺陷。 我将揭示这一缺陷，这不仅是为了澄清这个问题，更重要的是因为它重新教会了我们约翰·贝尔四十年前就教给我们的一个老教训。 我将论证，这个教训为我们提供了与贝尔型不等式现代研究特别相关的新的道德观。 显示英文摘要

摘要： Chen (quant-ph/0611126) has recently claimed ``exponential violation of local realism by separable states", in the sense that multi-partite separable quantum states are supposed to give rise to correlations and fluctuations that violate a Bell-type inequality that Chen takes to be satisfied by local realism. However, this can not be true since all predictions (including all correlations and fluctuations) that separable quantum states give rise to have a local realistic description and thus satisfy all Bell-type inequalities, and this holds for all number of parties. Since Chen claims otherwise by presenting a new inequality, claimed to be a Bell-type one, which separable states supposedly can violate, there must be a flaw in the argumentation. I will expose this flaw, not merely for clarification of this issue, but perhaps even more importantly since it re-teaches us an old lesson John Bell taught us over 40 years ago. I will argue that this lesson provides us with a new morale especially relevant to modern research in Bell-type inequalities.