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arXiv 2209.02697quant-ph
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用于多光子吸收量子增强测量的非线性干涉测量法

Nonlinear Interferometry for Quantum-Enhanced Measurements of Multiphoton Absorption

Shahram Panahiyan, Carlos Sánchez Muñoz, Maria V. Chekhova, Frank Schlawin

AI总结:

本文提出将多光子吸收体置于不平衡非线性干涉仪中,通过最优压缩态将多光子截面估计灵敏度随光子通量的功率标度提高一个数量级,并证明该方法对光子损失具有鲁棒性。

摘要:

多光子吸收在许多光谱、显微或光刻应用中至关重要。然而,由于它本质上是一个弱过程,多光子吸收信号的检测通常需要较大的场强,这限制了其在许多实际情形中的适用性。在这项工作中,我们表明,将多光子吸收体置于不平衡的非线性干涉仪中,可以相对于基于相干光甚至压缩光直接透射测量的策略,提高多光子截面估计的精度。特别是,与用相干光对样品进行透射测量相比,灵敏度随光子通量的功率标度可以提高一个数量级,这意味着可以在显著降低的激发强度下观察到信号。此外,我们表明,这种增强的测量精度对导致光子损失的实验不完美具有鲁棒性,而光子损失通常会降低检测灵敏度。我们将这种增强的起源追溯到一个必须在非线性 SU(1,1) 干涉仪中产生的最优压缩度。

英文摘要:

Multiphoton absorption is of vital importance in many spectroscopic, microscopic or lithographic applications. However, given that it is an inherently weak process, the detection of multiphoton absorption signals typically requires large field intensities, hindering its applicability in many practical situations. In this work, we show that placing a multiphoton absorbent inside an imbalanced nonlinear interferometer can enhance the precision of multiphoton cross-section estimation with respect to strategies based on direct transmission measurements by coherent or even squeezed light. In particular, the power scaling of the sensitivity with photon flux can be increased by an order of magnitude compared to transmission measurements of the sample with coherent light, meaning that a signal could be observed at substantially reduced excitation intensities. Furthermore, we show that this enhanced measurement precision is robust against experimental imperfections leading to photon losses, which usually tend to degrade the detection sensitivity. We trace the origin of this enhancement to an optimal degree of squeezing which has to be generated in a nonlinear SU(1,1)-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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