01478nas a2200277 4500008004100000245005400041210005300095260001400148300001100162490000800173520078100181100001300962700001300975700001600988700001901004700001401023700001801037700001401055700001601069700001401085700001101099700001701110700001801127700001801145856003701163 2021 eng d00aRobust Self-Testing of Multiparticle Entanglement0 aRobust SelfTesting of Multiparticle Entanglement c12/7/2021 a2305030 v1273 a
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.
1 aWu, Dian1 aZhao, Qi1 aGu, Xue-Mei1 aZhong, Han-Sen1 aZhou, You1 aPeng, Li-Chao1 aQin, Jian1 aLuo, Yi-Han1 aChen, Kai1 aLi, Li1 aLe Liu, Nai-1 aLu, Chao-Yang1 aPan, Jian-Wei uhttps://arxiv.org/abs/2105.10298