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Chinese Physics Letters

Bell Theorem without Inequality for Some Generalized GHZ and W States

任昌亮, 石名俊, 杜江峰

Published Jan 1, 2007• 0 citations
OpenAlex

Abstract

贝尔没有不平等的定理被申请一些一般 Greenberger 角 Zeilinger (GHZ ) 状态和 W 状态和大量这在本地唯实论和量子论之间的状态罐头展览 all-versus-nothing 冲突。标准 GHZ 状态的盒子在我们的建议被包含。为一些，概括 GHZ 声明本地唯实论上的更集中的违背被表明。

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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±0.006. 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.