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This study presents a noise-robust experimental method for verifying genuine multipartite nonlocality in inflated quantum networks using multi-copy entangled states. By extending Gisin's Theorem to arbitrary party counts, the work establishes a unified equivalence between nonlocality, steering, and entanglement for pure states, validated through hybrid photonic networks. These advances offer a scalable framework for probing complex quantum correlations across diverse network topologies, which is critical for developing robust quantum internet architectures.
Testing Genuine Multipartite Nonlocality via an Inflated Network with Multi-copy Entangled States
arXiv:2303.14943v2 Announce Type: replace Abstract: Understanding the nonlocality of multipartite quantum systems provides valuable insights into their behaviors and potential applications. In this Letter, assuming a quantum network inflated with multiple copies of genuine multipartite entangled states, we propose a novel noise-robust approach to test the genuine multipartite nonlocality inherent in each copy under Svetlichny's biseparable model. This extends Gisin's Theorem to an arbitrary number of parties, establishing the equivalence among genuine multipartite nonlocality, genuine multipartite steering, and genuine multipartite entanglement for all multipartite pure states under multiple copies assumption. In the experiment, we employ a hybrid photonic quantum network to verify the genuine tripartite nonlocality of generalized Greenberger-Horne-Zeilinger (GHZ) and W states beyond previously explored parameter regimes. This work not only offers a unified robust method on exploring multipartite quantum correlations, but also opens a new avenue for studying genuine multipartite nonlocality through network-distributed multi-copy quantum states and different network topologies.
Abstract:Understanding the nonlocality of multipartite quantum systems provides valuable insights into their behaviors and potential applications. In this Letter, assuming a quantum network inflated with multiple copies of genuine multipartite entangled states, we propose a novel noise-robust approach to test the genuine multipartite nonlocality inherent in each copy under Svetlichny's biseparable model. This extends Gisin's Theorem to an arbitrary number of parties, establishing the equivalence among genuine multipartite nonlocality, genuine multipartite steering, and genuine multipartite entanglement for all multipartite pure states under multiple copies assumption. In the experiment, we employ a hybrid photonic quantum network to verify the genuine tripartite nonlocality of generalized Greenberger-Horne-Zeilinger (GHZ) and W states beyond previously explored parameter regimes. This work not only offers a unified robust method on exploring multipartite quantum correlations, but also opens a new avenue for studying genuine multipartite nonlocality through network-distributed multi-copy quantum states and different network topologies.
Main results, 6 pages, 4 figures. The supplementary materials is too large, see published version online (this https URL). We have added new theoretical results and experiments
arXiv:2303.14943 [quant-ph]
(or arXiv:2303.14943v2 [quant-ph] for this version)
Phys. Rev. Lett. 136, 220201(2026)
https://doi.org/10.1103/mwxx-ln9v DOI(s) linking to related resources
Full text under the publisher's open licence · 193 words
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