Distribution and Generation of Quantum Coherence for Gaussian States in de Sitter Space,Annalen Der Physik

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Distribution and Generation of Quantum Coherence for Gaussian States in de Sitter Space
Annalen Der Physik ( IF 2.2 ) Pub Date : 2021-02-12 , DOI: 10.1002/andp.202000536
Qianqian Liu ₁ , Cuihong Wen ₁ , Jieci Wang ₁ , Jiliang Jing ₁

Affiliation

The distribution and generation of quantum coherence for two‐mode and multi‐mode Gaussian states in de Sitter space are studied. It is found that the quantum coherence is redistributed among the mode in different open charts under the curvature effect of de Sitter space. In particular, the Gaussian coherence for the initially correlated state is found to survive in the limit of infinite curvature, while quantum entanglement vanishes in this limit. Unlike entanglement and steering, the coherence of a massive scalar field is more robust than a massless field under the influence of curvature of de Sitter space. In addition, it is shown that the curvature generates two‐mode Gaussian state and three‐mode Gaussian state quantum coherence among the open charts, even though the observers are localized in causally disconnected regions. It is worth noting that the gravity‐generated three‐mode coherence is extremely sensitive to the curvature effect for the conformal and massless scalar fields, which may be in principle employed to design an effective detector for the space curvature.

中文翻译：

de Sitter空间中高斯态的量子相干的分布和产生

研究了de Sitter空间中双模和多模高斯态的量子相干的分布和产生。发现在de Sitter空间的曲率效应下，量子相干性在不同的开放图中的模式之间重新分布。尤其是，发现初始关联状态的高斯相干性在无限曲率的极限中得以生存，而量子纠缠在该极限中消失了。与纠缠和转向不同，在de Sitter空间曲率的影响下，大质量标量场的相干性比无质量场强。此外，它表明，即使观察者位于因果关系断开的区域中，曲率也会在开放图之间产生二模高斯态和三模高斯态量子相干。

更新日期：2021-04-08

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