Observation of eight-photon entanglement
Xing-Can Yao, Tian-Xiong Wang, Ping Xu, He Lu, Ge-Sheng Pan, Xiao-Hui, Bao, Cheng-Zhi Peng, Chao-Yang Lu, Yu-Ao Chen, Jian-Wei Pan

TL;DR
This paper reports the experimental creation of an eight-photon Schrödinger cat state using ultra-bright entangled photon sources, an eight-photon interferometer, and post-selection, demonstrating advanced multi-photon quantum state manipulation.
Contribution
It is the first experimental demonstration of an eight-photon entangled Schrödinger cat state with high fidelity.
Findings
Achieved an eight-photon Schrödinger cat state with fidelity of 0.708
Demonstrated manipulation of eight individual photons
Used ultra-bright sources and post-selection techniques
Abstract
Using ultra-bright sources of pure-state entangled photons from parametric down conversion, an eight-photon interferometer and post-selection detection, we demonstrate the ability to experimentally manipulate eight individual photons and report the creation of an eight-photon Schr\"odinger cat state with an observed fidelity of .
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