论文标题
评估单模非经典性
Evaluating Single-mode Nonclassicality
论文作者
论文摘要
量化骨气模式的非经典性是量子光学中的重要但挑战任务。最近，已经提出了基于操作资源理论概念的第一个非古典性度量[Phys。 Rev. Research 2，023400（2020）]，该研究显示了几种至关重要的属性作为量子计量学的资源。在这里，我们采用该措施来评估和分类不同类别的非经典状态。我们发现一类状态可以在平均数量的激发次数的渐近极限中实现最大的非经典性。这些状态可以在感应方案（例如Ligo实验）中提供相同的灵敏度代替挤压真空。我们还发现，通过添加单光子，可以大大改善某些状态的非经典性。此外，我们探讨了一些有关如何在分析中评估混合状态的非古老性的示例，由于该度量的凸屋顶性质，通常很难计算出混合状态的非古老性。我们的结果将有助于在精确的传感任务中准备和利用非经典状态，例如在Mach-Zehnder干涉仪中的正交感测和相传感。
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.
