(上图为探测器夹角和量子自旋相关性的图示。对于自旋的量子相关性(假定100%侦测效率),局域隐变数理论的预测以实线显示,量子力学预测以虚线显示。) 贝尔定理意味着,阿尔伯特·爱因斯坦所主张的定域性原理,其预测不符合量子力学理论。由于很多实验的结果与量子力学理论的预测一致,显示出的量子关联远强过定域隐变数理论所能够解释,所以,物理学者拒绝接受定域实在论对于这些实验结果的解释。陷入找不到满意解答的窘境,物理学者只能无可奈何地勉强承认这是一种非因果关系的超光速效应。听大老李用几个简单的故事解释贝尔不等式: "话说大约在100年前,有一所很牛的大学,学校的物理系聘请来了阿尔伯特*爱因斯塔和尼尔斯*玻尔来做教授,这个物理系牛的不能再牛。当然两位教授也很严格,他们搞了这么个制度,每个学生在每天早上9点必须到某个教室集合,然后会领到一张试卷。试卷上只有一道题,而且是是非题,答案只有对或错两种选择......"
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