arXiv 2302.115352023-02-22physics.opticsquant-ph

有耗马赫-曾德尔干涉仪中的最佳相位测量

Optimal phase measurements in a lossy Mach-Zehnder interferometer

Wenfeng Huang, Xinyun Liang, Chun-Hua Yuan, Weiping Zhang, Liqing Chen

备注：: 8 pages, 6 figures

摘要：

本文讨论了马赫-曾德尔干涉仪（MZI）在有内损耗时的两种相位测量方法，并给出了相应的最佳条件。理论上我们发现，当芯参数（反射率，相位差）进行优化，相位灵敏度的两种方法可以达到一个广义的精度上的界限：标准干涉极限（SIL）。在实验中，我们设计了一个分束比和损耗可调的MZI来验证相位灵敏度优化。基于差分强度检测，在损失率从0.4到0.998处的灵敏度提高被证明，与理论结果很好地匹配。在一个臂中的损失高达0.998，我们通过优化反射率实现了2.5 dB的灵敏度提高，这相当于在单强度检测中提高了5.5 dB的灵敏度。这种最佳相位测量方法为有损干涉测量中正确使用资源提供了实用的解决方案。

英文摘要：

In this work, we discuss two phase-measurement methods for the Mach-Zehnder interferometer (MZI) in the presence of internal losses and give the corresponding optimum conditions. We find theoretically that when the core parameters (reflectivities, phase difference) are optimized, the phase sensitivity of the two methods can reach a generalized bound on precision: standard interferometric limit (SIL). In the experiment, we design an MZI with adjustable beam splitting ratios and losses to verify phase sensitivity optimization. The sensitivity improvements at loss rates from 0.4 to 0.998 are demonstrated based on difference-intensity detection, matching the theoretical results well. With a loss up to 0.998 in one arm, we achieve a sensitivity improvement of 2.5 dB by optimizing reflectivity, which equates to a 5.5 dB sensitivity improvement in single-intensity detection. Such optimal phase measurement methods provide practical solutions for the correct use of resources in lossy interferometry.

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摘要：

英文摘要：

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