论文标题
地球弯曲时空中量子和经典相关性的表征
Characterization of quantum and classical correlations in the Earth curved space-time
论文作者
论文摘要
量子系统的准备和遥远用户之间的量子信息任务的执行始终受到重力和相对论效应的影响。在这项工作中，我们定量分析地球的弯曲时空背景如何影响最初以两种模式挤压状态制备的光子对之间的经典和量子相关性。更具体地说，考虑到地球的旋转，地球周围的时空是由Kerr指标描述的。我们的结果表明，这些状态相关性最初在特定卫星的轨道高度上增加，它将随着卫星轨道高度的增加（当特殊的相对效应变得相关时）逐渐接近有限的价值。更重要的是，我们的分析表明，由总重力频移产生的相关变化可能达到卫星轨道上卫星高度内的<0.5 $ \％$的水平。
The preparation of quantum systems and the execution of quantum information tasks between distant users are always affected by gravitational and relativistic effects. In this work, we quantitatively analyze how the curved space-time background of the Earth affects the classical and quantum correlations between photon pairs that are initially prepared in a two-mode squeezed state. More specifically, considering the rotation of the Earth, the space-time around the Earth is described by the Kerr metric. Our results show that these state correlations, which initially increase for a specific range of satellite's orbital altitude, will gradually approach a finite value with increasing height of satellites orbit (when the special relativistic effects become relevant). More importantly, our analysis demonstrates that the changes of correlations generated by the total gravitational frequency shift could reach the level of <0.5$\%$ within the satellites height at geostationary Earth orbits.
