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arXiv 2006.16693quant-ph
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评价单模非经典性

Evaluating Single-mode Nonclassicality

Wenchao Ge, M. Suhail Zubairy

摘要:

量子玻色模的非经典性是量子光学中一个重要而又具有挑战性的课题。最近,已经提出了基于操作资源理论的概念的第一个非经典性度量[Phys. Rev. Research 2,023400(2020)],其显示了作为量子精密测量的资源的几个关键性质。在这里,我们应用的措施来评估和分类不同类别的非经典状态。我们发现了一类能在大平均激发数的渐近极限下达到最大非经典性的态。这些状态可以提供相同的灵敏度来代替感测方案中的压缩真空,LIGO实验我们还发现,某些状态的非经典性可以大大改善与单光子添加。此外,我们探讨了一些例子,如何评估分析的非经典混合状态,这是在一般情况下难以计算,由于凸屋顶性质的措施。我们的研究结果将是有用的准备和利用非经典状态的应用在精密传感任务,如正交传感和相位传感的马赫-曾德尔干涉仪。

英文摘要:

Quantifying nonclassicality of a bosonic mode is an important but challenge task in quantum optics. Recently, the first nonclassicality measure based on the concept of operational resource theory has been proposed [Phys. Rev. Research 2, 023400 (2020)], which shows several crucial properties as a resource for quantum metrology. Here we apply the measure to evaluate and categorize different classes of nonclassical states. We discover a class of states that can achieve the maximum nonclassicality in the asymptotic limit of large mean number of excitations. These states can provide the same sensitivity in place of a squeezed vacuum in a sensing scheme, e.g., the LIGO experiments. We also discover that the nonclassicality of certain states can be greatly improved with a single-photon addition. Besides, we explore some examples on how to evaluate analytically the nonclassicality of mixed states, which are in general difficult to calculate due to the convex roof nature of the measure. Our results will be useful for preparing and utilizing nonclassical states for applications in precision sensing tasks, such as quadrature sensing and phase sensing in a Mach-Zehnder interferometer.

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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