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Test of Genuine Multipartite Nonlocality
Ya-Li Mao1,2, Zheng-Da Li1, Sixia Yu3
1Shenzhen Institute for Quantum Science and Engineering and Department of Physics, Southern University of Science and Technology, Shenzhen, 518055, China.
Physical Review Letters
|October 21, 2022
Summary
Genuine multipartite nonlocality, a complex quantum phenomenon, is confirmed experimentally. Our findings show that correlations in many-body systems cannot be explained by simpler quantum resources, highlighting nature's profound nonlocality.
Area of Science:
- Quantum Information Science
- Quantum Foundations
- Many-Body Physics
Background:
- Bell nonlocality in bipartite systems is counterintuitive.
- Multipartite nonlocality in many-body systems is even more complex.
- Previous theories suggest genuine multipartite nonlocality resists explanations by fewer-partite nonclassical resources.
Purpose of the Study:
- To provide a Bell-type inequality for testing genuine multipartite nonlocality in networks.
- To experimentally demonstrate violations of this inequality using multipartite entangled states.
- To confirm that nature exhibits boundless multipartite nonlocality.
Main Methods:
- Developed a Bell-type inequality using a matrix representation of causal structure.
- Performed experimental demonstrations with four-photon Greenberger-Horne-Zeilinger (GHZ) states.
- Utilized generalized four-photon GHZ states for further validation.
Main Results:
- The proposed Bell-type inequality was significantly violated by the experimental states.
- Observed four-partite correlations were shown to resist explanations involving three-way nonlocal resources.
- Experimental results confirm genuine multipartite nonlocality.
Conclusions:
- Nature exhibits genuine multipartite nonlocality, extending beyond bipartite scenarios.
- The findings challenge causal theories relying on limited nonclassical resources.
- This work provides a new tool for probing complex quantum correlations in multipartite systems.
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