The power of microscopic nonclassical states to amplify the precision of macroscopic optical metrology
The power of microscopic nonclassical states to amplify the precision of macroscopic optical metrology
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DOI：
10.1038/s41534-022-00670-9
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发表时间：
2021-03
影响因子：
7.6
通讯作者：
Wenchao Ge;K. Jacobs;M. Zubairy
中科院分区：
文献类型：
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作者：
Wenchao Ge;K. Jacobs;M. Zubairy
众所周知，使用强经典光的马赫曾德干涉仪进行相位测量的精度可以通过添加弱非经典光而大大提高。在量化非经典性的背景下，非经典态以这种方式提高精度的程度被称为其“计量能力”。迄今为止，弱非经典态提供的增强仅针对特定的测量配置进行了计算。在这里，我们能够优化所有测量配置，以获得任何单模或多模非经典态与强经典态一起可以实现的最大增强，适用于采用任何线性或非线性单模酉变换的局域和分布式量子计量。我们的分析表明，正交位移传感的量子费希尔信息是决定所有这些不同场景中可实现的最大增强的唯一属性，从而提供计量功率的统一量化。
It is well-known that the precision of a phase measurement with a Mach-Zehnder interferometer employing strong classic light can be greatly enhanced with the addition of weak nonclassical light. In the context of quantifying nonclassicality, the amount by which a nonclassical state can enhance precision in this way has been termed its ’metrological power’. To-date, the enhancement provided by weak nonclassical states has been calculated only for specific measurement configurations. Here we are able to optimize over all measurement configurations to obtain the maximum enhancement that can be achieved by any single or multi-mode nonclassical state together with strong classical states, for local and distributed quantum metrology employing any linear or nonlinear single-mode unitary transformation. Our analysis reveals that the quantum Fisher information for quadrature-displacement sensing is the sole property that determines the maximum achievable enhancement in all of these different scenarios, providing a unified quantification of the metrological power.