Measurements serve as the intermediate communication layer between the quantum world and our classical perception. So, the question of which measurements efficiently extract information from quantum systems is of central interest. Using quantum steering as a nonclassical phenomenon, we show that there are instances where the results of all two-outcome measurements can be explained in a classical manner, while the results of some three-outcome measurements cannot. This points to the important role of the number of outcomes in revealing the nonclassicality hidden in a quantum system. Moreover, our methods allow us to improve the understanding of quantum correlations by delivering novel criteria for quantum steering and improved ways to construct local hidden variable models.

中文翻译：

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具有三个结果的某些量子测量可以揭示非经典性，而所有两个结果的测量均无法做到这一点

测量是量子世界和我们的经典感知之间的中间交流层。因此，哪些测量有效地从量子系统中提取信息的问题是中心关注的问题。使用量子转向作为一种非经典现象，我们证明了在某些情况下可以用经典方式解释所有两次结果测量的结果，而某些三次结果测量的结果却不能。这指出了结果数量在揭示隐藏在量子系统中的非经典性中的重要作用。此外，我们的方法允许我们通过提供新的量子控制标准和改进的构建局部隐藏变量模型的方法来增进对量子相关性的理解。