Experimental Greenberger-Horne-Zeilinger type six-photon quantum nonlocality

Quantum nonlocality gives us deeper insight into quantum physics. In addition, quantum nonlocality has been further recognized as an essential resource for device-independent quantum information processing in recent years. Most experiments of nonlocality are performed using a photonic system. However, until mow, photonic experiments of nonlocality have involved at most four photons. Here, for the first time, we experimentally demonstrate the six-photon quantum nonlocality in an all-versus-nothing manner based on a high-fidelity (88.4{\%}) six-photon Greenberger-Horne-Zeilinger (GHZ) state. Our experiment pushes multi-photon nonlocality studies forward to the six-photon region and might provide a larger photonic system for device-independent quantum information protocols.