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Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)

Topologically Protected Entanglement Emitters

Tianxiang Dai, Yutian Ao, Jueming Bao, Jun Mao, Yulin Chi, Zhaorong Fu, Yiling You, Xiaojiong Chen, Chonghao Zhai, Bo Tang, Yan Yang, Zhihua Li, Luqi Yuan, Fei Gao, Xiao Lin, Mark G. Thompson, Jeremy L. O’Brien, Yan Li, Xiaoyong Hu, Qihuang Gong, Jianwei Wang

Published Jul 31, 2022• 0 citations
Publisher

Abstract

We report topologically-protected entanglement emitters, that emit topological Einstein-Podolsky-Rosen state and multiphoton entangled state from a plug-and-play silicon-photonic chip emulating a photonic anomalous Floquet insulator in ambient conditions.
DOI
10.1109/cleo-pr62338.2022.10431935

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The robust generation and manipulation of entangled multiphoton states on chip has an essential role in quantum computation and communication. Lattice topology has emerged as a means of protecting photonic states from disorder, but entanglement across different topologies remains unexplored. We report biphoton entanglement between topologically distinct spatial modes in a bipartite array of silicon waveguides. The results highlight topology as an additional degree of freedom for entanglement and open avenues for investigating information teleportation between trivial and topological modes.
Topological insulators combine insulating properties in the bulk with scattering-free transport along edges, supporting dissipationless unidirectional energy and information flow even in the presence of defects and disorder. The feasibility of engineering quantum Hamiltonians with photonic tools, combined with the availability of entangled photons, raises the intriguing possibility of employing topologically protected entangled states in optical quantum computing and information processing. However, while two-photon states built as a product of two topologically protected single-photon states inherit full protection from their single-photon "parents", high degree of non-separability may lead to rapid deterioration of the two-photon states after propagation through disorder. We identify physical mechanisms which contribute to the vulnerability of entangled states in topological photonic lattices and present clear guidelines for maximizing entanglement without sacrificing topological protection.