期刊
PHYSICAL REVIEW LETTERS
卷 122, 期 9, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.122.090402
关键词
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资金
- National Key Research and Development Program of China [2016YFA0302700, 2017YFA0304100]
- National Natural Science Foundation of China [11874344, 61835004, 61327901, 11774335, 91536219, 11821404]
- Key Research Program of Frontier Sciences, CAS [QYZDY-SSW-SLH003]
- Anhui Initiative in Quantum Information Technologies [AHY020100, AHY060300]
- Fundamental Research Funds for the Central Universities [WK2030020019, WK2470000026]
Bell state measurements, of which the eigenvectors are in an entangled form, are crucial resources in the construction of quantum networks. Therefore, device-independent certification of a Bell state measurement has significance in the quantum information process because it satisfies the exact demand on security. In this study, we implement a proof-of-concept experiment to certify a Bell state measurement device independently in an entanglement swapping process, namely, self-testing. Instead of preparing a tensor product of two singlets with four photons, multiplex encoding in polarization and spatial modes is utilized to produce two pairs of entangled qubits. As a result, we implement a full Bell state measurement and achieve a high degree of Bell violation on the remaining two qubits, which are required for nontrivial self-testing of a Bell state measurement. Furthermore, our results combine the correlations before and after the swapping; thus, the quality of the performed Bell state measurement can be precisely inferred.
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