Journal
PHYSICAL REVIEW LETTERS
Volume 128, Issue 25, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.128.250401
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Funding
- National Natural Science Foundation of China
- Chinese Academy of Sciences
- National Fundamental Research Program
- Anhui Initiative in Quantum Information Technologies
- Department of Defense through the Hartree Postdoctoral Fellowship in the Joint Center for Quantum Information and Computer Science (QuICS)
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This paper reports on the closure of the locality and detection loopholes in multiparticle self-testing experiments in both photonic and superconducting systems. Three-party and four-party GHZ states have been certified with high fidelities using device-independent methods.
First proposed by Mayers and Yao, self-testing provides a certification method to infer the underlying physics of quantum experiments in a black-box scenario. Numerous demonstrations have been reported to self-test various types of entangled states. However, all the multiparticle self-testing experiments reported so far suffer from both detection and locality loopholes. Here, we report the first experimental realization of multiparticle entanglement self-testing closing the locality loophole in a photonic system, and the detection loophole in a superconducting system, respectively. We certify three-party and four-party GHZ states with at least 0.84(1) and 0.86(3) fidelities in a device-independent way. These results can be viewed as a meaningful advance in multiparticle loophole-free self-testing, and also significant progress on the foundations of quantum entanglement certification.
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