Abstract

We investigate spontaneous parametric downconversion (SPDC) in a waveguide array supporting two strongly coupled topological guided modes. We show that it is possible to generate photon pairs that are hyper-entangled in energy and path. We study the state robustness against positional disorder of the waveguides, in terms of Schmidt number (SN), fidelity, and density matrix. We show that quantum correlations are in general robust due to the peculiar interplay between structure topology and second-order nonlinear interaction.

© 2021 Optical Society of America

Generation of hyper-entangled photons in a hot atomic vapor

Chengyuan Wang, Chung-Hyun Lee, Yosep Kim, and Yoon-Ho Kim
Opt. Lett. 45(7) 1802-1805 (2020)

Broadband fiber-based entangled photon-pair source at telecom O-band

Changjia Chen, Calvin Xu, Arash Riazi, Eric Y. Zhu, Alexey V. Gladyshev, Peter G. Kazansky, and Li Qian
Opt. Lett. 46(6) 1261-1264 (2021)

Coupled cavity-waveguide based on topological corner state and edge state

Aoqian Shi, Bei Yan, Rui Ge, Jianlan Xie, Yuchen Peng, Hang Li, Wei E. I. Sha, and Jianjun Liu
Opt. Lett. 46(5) 1089-1092 (2021)

Experimental optimal generation of hybrid entangled states in photonic quantum walks

Si-Jing Tao, Qin-Qin Wang, Zhe Chen, Wei-Wei Pan, Shang Yu, Geng Chen, Xiao-Ye Xu, Yong-Jian Han, Chuan-Feng Li, and Guang-Can Guo
Opt. Lett. 46(8) 1868-1871 (2021)

Entangled photons from subwavelength nonlinear films

Tomás Santiago-Cruz, Vitaliy Sultanov, Haizhong Zhang, Leonid A. Krivitsky, and Maria V. Chekhova
Opt. Lett. 46(3) 653-656 (2021)