%0 Journal Article %J Phys. Rev. Lett. %D 2021 %T Robust Self-Testing of Multiparticle Entanglement %A Dian Wu %A Qi Zhao %A Xue-Mei Gu %A Han-Sen Zhong %A You Zhou %A Li-Chao Peng %A Jian Qin %A Yi-Han Luo %A Kai Chen %A Li Li %A Nai-Le Liu %A Chao-Yang Lu %A Jian-Wei Pan %X

Quantum self-testing is a device-independent way to certify quantum states and measurements using only the input-output statistics, with minimal assumptions about the quantum devices. Due to the high demand on tolerable noise, however, experimental self-testing was limited to two-photon systems. Here, we demonstrate the first robust self-testing for multi-particle quantum entanglement. We prepare two examples of four-photon graph states, the Greenberger-Horne-Zeilinger (GHZ) states with a fidelity of 0.957(2) and the linear cluster states with a fidelity of 0.945(2). Based on the observed input-output statistics, we certify the genuine four-photon entanglement and further estimate their qualities with respect to realistic noise in a device-independent manner.

%B Phys. Rev. Lett. %V 127 %P 230503 %8 12/7/2021 %G eng %U https://arxiv.org/abs/2105.10298 %R https://doi.org/10.1103/PhysRevLett.127.230503