Van der Waals engineering for quantum-entangled photon generation

• Main Authors: Kallioniemi, Leevi, Lyu, Xiaodan, He, Ruihua, Rasmita, Abdullah, Duan, Ruihuan, Liu, Zheng, Gao, Weibo
• Other Authors: School of Physical and Mathematical Sciences
• Format: Article
• Language: English
• Published: 2025
• Subjects: Engineering; Entangled photons; Excitonics
• Online Access: https://hdl.handle.net/10356/182690
• Institution: Nanyang Technological University

Van der Waals engineering serves as a powerful tool to tailor material properties and design excitonic devices. Here we report quantum-entangled photon pair generation through van der Waals engineering with two-dimensional materials. We align two van der Waals thin layers perpendicular to each other, yielding polarization-entangled photon pairs through the interference of biphoton emission in the two flakes. The polarization-entangled state is measured with a fidelity up to 86 ± 0.7%. The compatibility of van der Waals engineering with on-chip photonics opens new possibilities for entangled photon source integration at the subwavelength scale.