论文标题
比较量子标准
Comparing quantumness criteria
论文作者
论文摘要
可以通过多种方法来测量系统的量子性。在本文中，我们比较了处于高斯州的系统，比较了不同的标准，即量子不平等，违反贝尔不平等和不可分割性。当状态纯净时，这些标准是等效的，而我们发现它们在发生变形时不一定是重合的。最后，我们证明这些标准基本上由代表状态在相空间中的状态函数的椭圆轴的半尺轴控制。
Measuring the quantumness of a system can be done with a variety of methods. In this article we compare different criteria, namely quantum discord, Bell inequality violation and non-separability, for systems placed in a Gaussian state. When the state is pure, these criteria are equivalent, while we find that they do not necessarily coincide when decoherence takes place. Finally, we prove that these criteria are essentially controlled by the semi-minor axis of the ellipse representing the state's Wigner function in phase space.
