title: Experimental test of genuine multipartite nonlocality under the no-signalling principle.
abstract: Genuine multipartite nonlocality (GMN) has been recognized as the strongest form of multipartite quantum correlation. However, there exist states that cannot violate the Svetlichny inequality derived from the standard definition of GMN, even though they possess GMN properties. The reason is that the standard definition of GMN allows correlations that permit signalling among parties, which is inconsistent with an operational definition. Here, for the first time, we present an experimental test of GMN in the no-signalling scenario, with a three-photon pure state |ψs〉 and a noisy W state. The experimental results show that these states cannot violate the Svetlichny inequality. However, our results also demonstrate that they do violate a new inequality derived from the definition of GMN based on the no-signalling principle, i.e., these states can exhibit GMN under the requirement of no-signalling. Our results will be useful for the study and applications of GMN in quantum communications and quantum computation.
authors.affiliation: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei, 230026, China.|Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, 230026, P.R. China.
authors.forename: Chao
authors.initials: C
authors.lastname: Zhang
authors.affiliation: College of Physics, Optoelectronics and Energy, Soochow University, Suzhou, 215006, China.|Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543, Singapore.
authors.forename: Cheng-Jie
authors.initials: CJ
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei, 230026, China.|Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, 230026, P.R. China.
authors.forename: Yun-Feng
authors.initials: YF
authors.lastname: Huang
authors.affiliation: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei, 230026, China.|Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, 230026, P.R. China.
authors.forename: Zhi-Bo
authors.initials: ZB
authors.lastname: Hou
authors.affiliation: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei, 230026, China.|Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, 230026, P.R. China.
authors.forename: Bi-Heng
authors.initials: BH
authors.lastname: Liu
authors.affiliation: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei, 230026, China.|Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, 230026, P.R. China.
authors.forename: Chuan-Feng
authors.initials: CF
authors.lastname: Li
authors.affiliation: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei, 230026, China.|Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, 230026, P.R. China.
authors.forename: Guang-Can
authors.initials: GC
authors.lastname: Guo