期刊
PHYSICAL REVIEW LETTERS
卷 126, 期 23, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.126.230503
关键词
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资金
- National Natural Science Foundation of China (NSFC) [61590932, 62035016, 61775243, 11774333, 11904421, 62061160487, 11761161002]
- Anhui Initiative in Quantum Information Technologies [AHY130300]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB24030601]
- National Key RD Program [2016YFA0301700, 2019YFB2203502]
- Natural Science Foundation of Guangdong Province [2018B030308005]
- Guangzhou Science and Technology Program [202002030322]
- Fundamental Research Funds for the Central Universities
The researchers designed and fabricated nanophotonic topological harpoon-shaped beam splitters based on 120-deg-bending interfaces, demonstrating the first on-chip valley-dependent quantum information process. They achieved two-photon quantum interference with high visibility, showcasing a novel approach to on-chip quantum information processing through utilizing photonic valley states.
Topological photonics has been introduced as a powerful platform for integrated optics, since it can deal with robust light transport, and be further extended to the quantum world. Strikingly, valley-contrasting physics in topological photonic structures contributes to valley-related edge states, their unidirectional coupling, and even valley-dependent wave division in topological junctions. Here, we design and fabricate nanophotonic topological harpoon-shaped beam splitters (HSBSs) based on 120-deg-bending interfaces and demonstrate the first on-chip valley-dependent quantum information process. Two-photon quantum interference, namely, Hong-Ou-Mandel interference with a high visibility of 0.956 +/- 0.006, is realized with our 50/50 HSBS, which is constructed by two topologically distinct domain walls. Cascading this kind of HSBS together, we also demonstrate a simple quantum photonic circuit and generation of a path-entangled state. Our work shows that the photonic valley state can be used in quantum information processing, and it is possible to realize more complex quantum circuits with valley-dependent photonic topological insulators, which provides a novel method for on-chip quantum information processing.
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