通过非厄米拓扑增强灵敏度

IF 23.4 Q1 OPTICS
Midya Parto, Christian Leefmans, James Williams, Robert M. Gray, Alireza Marandi
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引用次数: 0

摘要

传感器是现代生活中不可或缺的工具,从智能手机、自动驾驶汽车到医疗保健行业和太空技术,传感器在各种环境中无处不在。通过连接多个传感器,这些传感器共同与待测信号相互作用,可以超越单个构成元件所能达到的信噪比(SNR)。这种技术也已经在量子体系中实现,其中通过使用纠缠态实现了信噪比的线性增加。沿着类似的路线,耦合的非厄米系统提供了额外的自由度,通过高阶异常点获得更好的传感器。最近,从理论上提出了一类新的非厄米系统,称为非厄米拓扑传感器(NTOS)。值得注意的是,非厄米性和拓扑之间的协同相互作用有望使这种传感器具有随传感器网络规模呈指数增长的增强灵敏度。在这里,我们实验证明了NTOS使用一个网络的光子时间复用谐振器在合成维度表示的光脉冲。通过合理地规划网络中的延迟线,我们实现了非厄米拓扑感知方案的原型Hatano-Nelson模型。我们实验测量了不同晶格尺寸的灵敏度,证实了NTOS的特征指数增强。我们证明了这种特殊的响应是由于非厄米性和拓扑之间的联合协同作用而产生的,这在厄米拓扑晶格中是不存在的。我们的NTOS演示为实现具有前所未有灵敏度的传感器铺平了道路。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Enhanced sensitivity via non-Hermitian topology

Enhanced sensitivity via non-Hermitian topology

Sensors are indispensable tools of modern life that are ubiquitously used in diverse settings ranging from smartphones and autonomous vehicles to the healthcare industry and space technology. By interfacing multiple sensors that collectively interact with the signal to be measured, one can go beyond the signal-to-noise ratios (SNR) attainable by the individual constituting elements. Such techniques have also been implemented in the quantum regime, where a linear increase in the SNR has been achieved via using entangled states. Along similar lines, coupled non-Hermitian systems have provided yet additional degrees of freedom to obtain better sensors via higher-order exceptional points. Quite recently, a new class of non-Hermitian systems, known as non-Hermitian topological sensors (NTOS) has been theoretically proposed. Remarkably, the synergistic interplay between non-Hermiticity and topology is expected to bestow such sensors with an enhanced sensitivity that grows exponentially with the size of the sensor network. Here, we experimentally demonstrate NTOS using a network of photonic time-multiplexed resonators in the synthetic dimension represented by optical pulses. By judiciously programming the delay lines in such a network, we realize the archetypal Hatano-Nelson model for our non-Hermitian topological sensing scheme. Our experimentally measured sensitivities for different lattice sizes confirm the characteristic exponential enhancement of NTOS. We show that this peculiar response arises due to the combined synergy between non-Hermiticity and topology, something that is absent in Hermitian topological lattices. Our demonstration of NTOS paves the way for realizing sensors with unprecedented sensitivities.

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来源期刊
Light-Science & Applications
Light-Science & Applications 数理科学, 物理学I, 光学, 凝聚态物性 II :电子结构、电学、磁学和光学性质, 无机非金属材料, 无机非金属类光电信息与功能材料, 工程与材料, 信息科学, 光学和光电子学, 光学和光电子材料, 非线性光学与量子光学
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803
审稿时长
2.1 months
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