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arXiv 2603.26355quant-ph
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高可见性弗朗索特定量干涉通过电信波长的被动光子集成干涉仪实现

High-Visibility Franson Interference Enabled by Passive Photonic Integrated Interferometers at Telecom Wavelengths

CNR–INO(意大利国家研究委员会-光学研究所);Dipartimento di Fisica, Università degli Studi di Firenze(佛罗伦萨大学物理系);European Laboratory for Non-Linear Spectroscopy (LENS)(欧洲非线性光谱学实验室);QTI srl(QTI有限公司)

Ramin Emadi, Domenico Ribezzo, Giulia Guarda, Davide Bacco, Alessandro Zavatta

AI总结:

利用PPLN波导光子对源与被动路径不平衡Mach-Zehnder干涉仪实现高可见性弗朗索特定量干涉,通过热调制实现相位扫描,获得高光谱可区分性光子对及97.1%干涉可见度。

摘要:

在电信C波段波长处,通过 cascaded periodically poled lithium niobate (PPLN) 波导光子对源与完全被动的路径不平衡Mach-Zehnder干涉仪相结合,实现了高可见性弗朗索特定量干涉。干涉仪无需芯片内相位调节器或主动稳定,相位通过芯片热调制扫描。通过使用窄线宽连续波 (CW) 泵浦和密集波分复用 (DWDM) 过滤,生成具有高光谱可区分性的能量-时间纠缠光子对。我们实现了4.8%的触发效率和97.1%的双光子干涉可见度,从正弦条纹拟合(原始可见度95.2%和背景校正可见度95.6%)中获得,同时在仅1.7 mW泵浦功率下实现了超过1000的重合率与偶然率比。这些结果代表了在紧凑、光纤集成平台上基于PIC的分析器中报告的最高弗朗索特定量干涉可见度之一。

英文摘要:

High-visibility Franson interference at telecom C-band wavelengths is achieved using a cascaded periodically poled lithium niobate (PPLN) waveguide photon-pair source combined with fully passive, path-imbalanced Mach-Zehnder interferometers implemented on photonic integrated circuits (PICs). The interferometers require neither on-chip phase shifters nor active stabilization; instead, the phase is scanned via thermal tuning of the chip. By employing a narrow-linewidth continuous-wave (CW) pump and dense wavelength-division multiplexing (DWDM) filtering, energy-time entangled photon pairs with high spectral indistinguishability are generated. We achieve a 4.8% heralding efficiency and a two-photon interference visibility of 97.1% from sinusoidal fringe fitting (raw visibility 95.2% and background-corrected visibility 95.6%), alongside a coincidence-to-accidental ratio (CAR) exceeding 1000 at only 1.7 mW of pump power. These results represent one of the highest Franson-interference visibilities reported for a PIC-based analyzer within a compact, fiber-integrated platform.

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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