层抛光铌酸锂纳米光子波导中的高效光子对生成

IF 20.6 Q1 OPTICS
Xiaodong Shi, Sakthi Sanjeev Mohanraj, Veerendra Dhyani, Angela Anna Baiju, Sihao Wang, Jiapeng Sun, Lin Zhou, Anna Paterova, Victor Leong, Di Zhu
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引用次数: 0

摘要

集成光子对源对于可扩展的光子量子系统至关重要。铌酸锂薄膜是通过自发参量下变频(SPDC)产生片上光子对的一个前景广阔的平台。然而,器件的实现面临着实际挑战。周期性极化铌酸锂(PPLN)虽然能实现灵活的准相位匹配,但制造可靠性和器件可重复性较差,而传统的模态相位匹配(MPM)方法由于模态重叠不足而导致效率有限。在此,我们介绍一种层极性铌酸锂(LPLN)纳米光子波导,用于高效光子对生成。它通过电极化利用层向极性反转来打破空间对称性并显著增强 MPM 的非线性相互作用,实现了 4615% W-1cm-2 的显著归一化二次谐波发生(SHG)转换效率。通过级联 SHG 和 SPDC 工艺,我们在 3.3 毫米长的 LPLN 波导中演示了归一化亮度为 3.1 × 106 Hz nm-1 mW-2 的光子对生成,超越了类似工作配置下的现有片上光源。最重要的是,与 PPLN 器件相比,我们的 LPLN 波导提高了制造可靠性,降低了对几何变化和温度波动的敏感性。我们预计 LPLN 将成为片上非线性波长转换和非经典光生成的一种前景广阔的解决方案,可立即应用于量子通信、网络和片上光子量子信息处理。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Efficient photon-pair generation in layer-poled lithium niobate nanophotonic waveguides

Efficient photon-pair generation in layer-poled lithium niobate nanophotonic waveguides

Integrated photon-pair sources are crucial for scalable photonic quantum systems. Thin-film lithium niobate is a promising platform for on-chip photon-pair generation through spontaneous parametric down-conversion (SPDC). However, the device implementation faces practical challenges. Periodically poled lithium niobate (PPLN), despite enabling flexible quasi-phase matching, suffers from poor fabrication reliability and device repeatability, while conventional modal phase matching (MPM) methods yield limited efficiencies due to inadequate mode overlaps. Here, we introduce a layer-poled lithium niobate (LPLN) nanophotonic waveguide for efficient photon-pair generation. It leverages layer-wise polarity inversion through electrical poling to break spatial symmetry and significantly enhance nonlinear interactions for MPM, achieving a notable normalized second-harmonic generation (SHG) conversion efficiency of 4615% W−1cm−2. Through a cascaded SHG and SPDC process, we demonstrate photon-pair generation with a normalized brightness of 3.1 × 106 Hz nm−1 mW−2 in a 3.3 mm long LPLN waveguide, surpassing existing on-chip sources under similar operating configurations. Crucially, our LPLN waveguides offer enhanced fabrication reliability and reduced sensitivity to geometric variations and temperature fluctuations compared to PPLN devices. We expect LPLN to become a promising solution for on-chip nonlinear wavelength conversion and non-classical light generation, with immediate applications in quantum communication, networking, and on-chip photonic quantum information processing.

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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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