Polarization-entangled photon-pair source with van der Waals 3R-WS2 crystal di Feng, Jiangang, Wu, Yun-Kun, Duan, Ruihuan, Wang, Jun, Chen, Weijin, Qin, Jiazhang, Liu, Zheng, Guo, Guang-Can, Ren, Xi-Feng, Qiu, Cheng-Wei

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