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arXiv 2209.12656quant-ph
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增强引力纠缠的调制光机械学

Enhanced Gravitational Entanglement via Modulated Optomechanics

A. Douglas K. Plato, Dennis Rätzel, Chuanqi Wan

AI总结:

本研究通过调制光机械耦合显著增强两个隔离系统间的引力介导纠缠率,尤其在低质量高频系统中提升多个数量级,但伴随等量退相干增加,并揭示量子关联观测与测量精度极限的紧密联系。

摘要:

纠缠在决定给定相互作用的非经典性中的作用在过去几年中获得了显著关注,特别是作为测试引力场量子性质的新实验方案的基础。在这里,我们展示了通过调制光机械耦合,可以显著增加两个原本隔离的光机械系统之间引力介导的纠缠率。这在低质量、高频率系统中最为明显——这些系统便于达到量子区域——并且可以带来几个数量级的改进,以及测量窗口的拓宽。尽管如此,重大障碍仍然存在。特别是,我们发现调制以与纠缠改进相同的速率增加退相干效应。这进一步证明了关于噪声(作用于位置自由度)的约束仅取决于粒子质量、分离距离和环境温度,且无法通过新颖的量子控制来改善。最后,我们强调了量子关联的观测与通过Cramér-Rao界推导的测量精度极限之间的紧密联系。一个直接后果是,探测引力场的叠加态对探测器灵敏度的要求与纠缠验证相当。

英文摘要:

The role of entanglement in determining the non-classicality of a given interaction has gained significant traction over the last few years. In particular, as the basis for new experimental proposals to test the quantum nature of the gravitational field. Here we show that the rate of gravity mediated entanglement between two otherwise isolated optomechanical systems can be significantly increased by modulating the optomechanical coupling. This is most pronounced for low mass, high frequency systems - convenient for reaching the quantum regime - and can lead to improvements of several orders of magnitude, as well as a broadening of the measurement window. Nevertheless, significant obstacles still remain. In particular, we find that modulations increase decoherence effects at the same rate as the entanglement improvements. This adds to the growing evidence that the constraint on noise (acting on the position d.o.f) depends only on the particle mass, separation, and temperature of the environment and cannot be improved by novel quantum control. Finally, we highlight the close connection between the observation of quantum correlations and the limits of measurement precision derived via the Cramér-Rao Bound. An immediate consequence is that probing superpositions of the gravitational field places similar demands on detector sensitivity as entanglement verification.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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