Graph states -- one of the most representative families of multipartite entangled states, are important resources for multiparty quantum communication, quantum error correction, and quantum computation. Device-independent certification of highly entangled graph states plays a prominent role in the quantum information processing tasks. Here we have experimentally demonstrated device-independent certification for multipartite graph states, by adopting the robust self-testing scheme based on scalable Bell inequalities. Specifically, the prepared multi-qubit Greenberger-Horne-Zeilinger (GHZ) states and linear cluster states achieve a high degree of Bell violation, which are beyond the nontrivial bounds of the robust self-testing scheme. Furthermore, our work paves the way to the device-independent certification of complex multipartite quantum states.
@article{arxiv.2111.07562,
title = {Experimental self-testing for photonic graph states},
author = {Jia-Min Xu and Qing Zhou and Yu-Xiang Yang and Zi-Mo Cheng and Xin-Yu Xu and Zhi-Cheng Ren and Xi-Lin Wang and Hui-Tian Wang},
journal= {arXiv preprint arXiv:2111.07562},
year = {2022}
}