de Sitter空间中的量子不协调
Quantum discord in de Sitter space
摘要：
研究了de Sitter空间中大质量标量场在最大纠缠态中两个自由模之间的量子不协调。我们引入两个观察者，一个在整体图中，另一个在德西特空间的开放图中，观察者确定每个检测模式之一所产生的量子不和谐。这种情况类似于平面空间中闵可夫斯基图中的一个观察者和两个林德勒图中的另一个观察者之间的关系。我们发现，随着开图的曲率变大，状态的纠缠度变小。特别地，对于无质量和共形耦合的标量场，纠缠在无限曲率的极限下消失。然而，我们发现，即使在纠缠消失的极限下，量子不协调也不会消失。
英文摘要：
We study quantum discord between two free modes of a massive scalar field in a maximally entangled state in de Sitter space. We introduce two observers, one in a global chart and the other in an open chart of de Sitter space, and the observers determine the quantum discord created by each detecting one of the modes. This situation is analogous to the relationship between an observer in a Minkowski chart and another in one of the two Rindler charts in flat space. We find that the state becomes less entangled as the curvature of the open chart gets larger. In particular, for the cases of a massless, and a conformally coupled scalar field, the entanglement vanishes in the limit of infinite curvature. However, we find that the quantum discord never disappears even in the limit that entanglement disappears.
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