Nguyen H Chau, Gühne Otfried
Naturwissenschaftlich-Technische Fakultät, Universität Siegen, Walter-Flex-Straße 3, 57068 Siegen, Germany.
Phys Rev Lett. 2020 Dec 4;125(23):230402. doi: 10.1103/PhysRevLett.125.230402.
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.
测量作为量子世界与我们经典认知之间的中间通信层。因此，哪些测量能有效地从量子系统中提取信息的问题备受关注。利用量子导引作为一种非经典现象，我们表明存在这样的情况：所有两结果测量的结果都可以用经典方式解释，而一些三结果测量的结果却不能。这指出了结果数量在揭示量子系统中隐藏的非经典性方面的重要作用。此外，我们的方法通过提供量子导引的新判据和构建局部隐变量模型的改进方法，使我们能够更好地理解量子关联。
