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Polarization entanglement enabled by orthogonally stacked van der Waals NbOCl2 crystals

Author

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  • Qiangbing Guo

    (National University of Singapore
    National University of Singapore)

  • Yun-Kun Wu

    (University of Science and Technology of China
    University of Science and Technology of China
    University of Science and Technology of China)

  • Di Zhang

    (City University of New York
    Nankai University)

  • Qiuhong Zhang

    (University of Chinese Academy of Sciences)

  • Guang-Can Guo

    (University of Science and Technology of China
    University of Science and Technology of China
    University of Science and Technology of China)

  • Andrea Alù

    (City University of New York
    City University of New York)

  • Xi-Feng Ren

    (University of Science and Technology of China
    University of Science and Technology of China
    University of Science and Technology of China)

  • Cheng-Wei Qiu

    (National University of Singapore
    National University of Singapore)

Abstract

Polarization entanglement holds significant importance for photonic quantum technologies. Recently emerging subwavelength nonlinear quantum light sources, e.g., GaP and LiNbO3 thin films, benefiting from the relaxed phase-matching constraints and volume confinement, have shown intriguing properties, such as high-dimensional hyperentanglement and robust entanglement anti-degradation. Van der Waals (vdW) NbOCl2 crystal, with strong optical nonlinearities, has emerged as a potential candidate for ultrathin quantum light sources. However, polarization entanglement is inaccessible in the NbOCl2 crystal due to its unfavorable nonlinear susceptibility tensor. Here, by leveraging the twist-stacking degree of freedom inherently in vdW systems, we showcase the preparation of polarization entanglement and quantum Bell states.

Suggested Citation

  • Qiangbing Guo & Yun-Kun Wu & Di Zhang & Qiuhong Zhang & Guang-Can Guo & Andrea Alù & Xi-Feng Ren & Cheng-Wei Qiu, 2024. "Polarization entanglement enabled by orthogonally stacked van der Waals NbOCl2 crystals," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-54876-w
    DOI: 10.1038/s41467-024-54876-w
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