Observation of quantum nonlocality in Greenberger-Horne-Zeilinger entanglement on a silicon chip

• URL: http://arxiv.org/abs/2311.16745v2
• Date: Fri, 19 Apr 2024 06:36:39 GMT
• Title: Observation of quantum nonlocality in Greenberger-Horne-Zeilinger entanglement on a silicon chip
• Authors: Leizhen Chen, Bochi Wu, Liangliang Lu, Kai Wang, Yanqing Lu, Shining Zhu, Xiao-Song Ma,
• Abstract summary: Greenberger-Horne-Zeilinger (GHZ) state allows one to observe the striking conflict of quantum physics to local realism. integrated photonic chip capable of generating and manipulating the four-photon GHZ state. Our work paves the way to perform fundamental tests of quantum physics with complex integrated quantum devices.
• Score: 4.895323415185291
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Nonlocality is the defining feature of quantum entanglement. Entangled states with multiple particles are of crucial importance in fundamental tests of quantum physics as well as in many quantum information tasks. One of the archetypal multipartite quantum states, Greenberger-Horne-Zeilinger (GHZ) state, allows one to observe the striking conflict of quantum physics to local realism in the so-called all-versus-nothing way. This is profoundly different from Bell's theorem for two particles, which relies on statistical predictions. Here, we demonstrate an integrated photonic chip capable of generating and manipulating the four-photon GHZ state. We perform a complete characterization of the four-photon GHZ state using quantum state tomography and obtain a state fidelity of 0.729(6). We further use the all-versus-nothing test and the Mermin inequalities to witness the quantum nonlocality of GHZ entanglement. Our work paves the way to perform fundamental tests of quantum physics with complex integrated quantum devices.

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