Maximizing precision in saturation-limited absorption measurements
Maximizing precision in saturation-limited absorption measurements
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DOI：
10.1103/physreva.104.053717
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发表时间：
2021-11-22
影响因子：
2.9
通讯作者：
Allen, Euan J.
中科院分区：
文献类型：
--
作者：
Biele, Jake;Wollmann, Sabine;Allen, Euan J.
光探针强度的量子涨落是限制吸收光谱测量精度的噪声。增加探针功率可以提供更高的精度;然而，这种策略通常受到样品饱和度的限制。在这里，我们分析测量精度的广义吸收模型，其中我们占饱和，并探讨其对经典和量子探针性能的影响。我们提出了一个经典的探针样本优化策略，以最大限度地提高精度，并发现最佳的探针功率总是落在饱和状态。我们将我们的优化策略应用于两个例子，高精度多普勒展宽测温和叶绿素a的吸收光谱测量。我们推导出使用非经典探针获得的最大精度的限制，并找到一个能够饱和这个界限的策略。我们评估了振幅压缩光作为一个可行的实验探测状态，并发现它能够提供精度达到85%以内的最终量子极限与目前可用的技术。
Quantum fluctuations in the intensity of an optical probe is noise which limits measurement precision in absorption spectroscopy. Increased probe power can offer greater precision; however, this strategy is often constrained by sample saturation. Here, we analyze measurement precision for a generalized absorption model in which we account for saturation and explore its effect on both classical and quantum probe performance. We present a classical probe-sample optimization strategy to maximize precision and find that optimal probe powers always fall within the saturation regime. We apply our optimization strategy to two examples, high-precision Doppler broadened thermometry and an absorption spectroscopy measurement of chlorophyll a. We derive a limit on the maximum precision gained from using a nonclassical probe and find a strategy capable of saturating this bound. We evaluate amplitude-squeezed light as a viable experimental probe state and find it capable of providing precision that reaches to within > 85% of the ultimate quantum limit with currently available technology.