TY - JOUR T1 - Robust Self-Testing of Multiparticle Entanglement JF - Phys. Rev. Lett. Y1 - 2021 A1 - Dian Wu A1 - Qi Zhao A1 - Xue-Mei Gu A1 - Han-Sen Zhong A1 - You Zhou A1 - Li-Chao Peng A1 - Jian Qin A1 - Yi-Han Luo A1 - Kai Chen A1 - Li Li A1 - Nai-Le Liu A1 - Chao-Yang Lu A1 - Jian-Wei Pan AB -

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.

VL - 127 U4 - 230503 UR - https://arxiv.org/abs/2105.10298 U5 - https://doi.org/10.1103/PhysRevLett.127.230503 ER -