Experimental self-testing for photonic graph states
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Jia-Min Xu, Qing Zhou, Yu-Xiang Yang, Zi-Mo Cheng, Xin-Yu Xu, Zhi-Cheng Ren, Xi-Lin Wang, Hui-Tian Wang
2021
Abstract
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.
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