Polarization entanglement enabled by orthogonally stacked van der Waals NbOCl2 crystals

Qiangbing Guo (), Yun-Kun Wu, Di Zhang, Qiuhong Zhang, Guang-Can Guo, Andrea Alù, Xi-Feng Ren () and Cheng-Wei Qiu ()
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Qiangbing Guo: National University of Singapore
Yun-Kun Wu: University of Science and Technology of China
Di Zhang: City University of New York
Qiuhong Zhang: University of Chinese Academy of Sciences
Guang-Can Guo: University of Science and Technology of China
Andrea Alù: City University of New York
Xi-Feng Ren: University of Science and Technology of China
Cheng-Wei Qiu: National University of Singapore

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: 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.

Date: 2024
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DOI: 10.1038/s41467-024-54876-w

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