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<p>Two-dimensional (2D) materials have been demonstrated as promising candidates for ultracompact entangled photon sources and on-chip integrated quantum photonic devices. Ferroelectric van der Waals materials have recently emerged as promising ultrathin sources of entangled photons via nonlinear optical processes. Here, the authors compare spontaneous parametric down conversion in NbOBr<sub>2</sub> and NbOI<sub>2</sub>, demonstrating near infrared polarization entangled photon generation and linking performance to crystal structure and optical properties. Our results extend the wavelength range of NbOX<sub>2</sub>-based SPDC sources and demonstrate NbOI<sub>2</sub> is especially suitable for near-infrared SPDC. Polarization entangled state (concurrence of 0.90 ± 0.05) can also be directly generated from NbOI<sub>2</sub>. Besides adding new candidates to the SPDC material library, our work provides new insight for the future generation of integrated quantum materials.</p>

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Nonlinear quantum light source with van der Waals ferroelectric NbOX2 (X = Br, I)

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月30日

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  • Yanru Wang,
  • Yunkun Wu,
  • Yong Liu,
  • Wanfu Shen,
  • Ya Feng,
  • Yue Liu,
  • Chen Yi,
  • Kun He,
  • Miaomiao Liu,
  • Ping Lu,
  • Shaojun Liu,
  • Yingying Liu,
  • Jingmei Tang,
  • Liqiang Zhang,
  • Chunguang Hu,
  • Shula Chen,
  • Guangcan Guo,
  • Xifeng Ren,
  • Xidong Duan

摘要

Two-dimensional (2D) materials have been demonstrated as promising candidates for ultracompact entangled photon sources and on-chip integrated quantum photonic devices. Ferroelectric van der Waals materials have recently emerged as promising ultrathin sources of entangled photons via nonlinear optical processes. Here, the authors compare spontaneous parametric down conversion in NbOBr2 and NbOI2, demonstrating near infrared polarization entangled photon generation and linking performance to crystal structure and optical properties. Our results extend the wavelength range of NbOX2-based SPDC sources and demonstrate NbOI2 is especially suitable for near-infrared SPDC. Polarization entangled state (concurrence of 0.90 ± 0.05) can also be directly generated from NbOI2. Besides adding new candidates to the SPDC material library, our work provides new insight for the future generation of integrated quantum materials.