Robust Self-Testing of Multiparticle Entanglement

• URL: http://arxiv.org/abs/2105.10298v3
• Date: Tue, 7 Dec 2021 15:39:41 GMT
• Title: Robust Self-Testing of Multiparticle Entanglement
• Authors: Dian Wu, Qi Zhao, Xue-Mei Gu, Han-Sen Zhong, You Zhou, Li-Chao Peng, Jian Qin, Yi-Han Luo, Kai Chen, Li Li, Nai-Le Liu, Chao-Yang Lu, Jian-Wei Pan
• Abstract summary: We demonstrate the first robust self-testing for multi-photon genuinely entangled quantum states. Based on the observed input-output statistics, we certify the genuine four-photon entanglement.
• Score: 17.83499282780475
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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. Because of 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-photon genuinely entangled quantum states. 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.

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