
无数据
Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117583, Singapore
CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China
CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
Hefei National Laboratory, University of Science and Technology of China, Hefei 230088, China
School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
Department of Optical Science and Engineering, and Shanghai Frontiers Science Research Base of Intelligent Optoelectronics and Perception, Fudan University, Shanghai 200433, China
*Yun-Kun Wuwuyk123@mail.ustc.edu.cn
Xi-Feng Renrenxf@ustc.edu.cn
Cheng-Wei Qiuchengwei.qiu@nus.edu.sg
Received:29 June 2024,
Revised:10 July 2024,
Accepted:2024-07-11,
Published Online:23 August 2024,
Published:2024
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Jiangang Feng, Yun-Kun Wu, Ruihuan Duan, et al. Polarization-entangled photon-pair source with van der Waals 3R-WS2 crystal[J]. Elight, 2024, 4.
Jiangang Feng, Yun-Kun Wu, Ruihuan Duan, et al. Polarization-entangled photon-pair source with van der Waals 3R-WS2 crystal[J]. Elight, 2024, 4. DOI: 10.1186/s43593-024-00074-6.
Ultracompact entangled photon sources are pivotal to miniaturized quantum photonic devices. Van der Waals (vdW) nonlinear crystals promise efficient photon-pair generation and on-chip monolithic integration with nanophotonic circuitry. However
it remains challenging to generate maximally entangled Bell states of photon pairs with high purity
generation rate
and fidelity required for practical applications. Here
we realize a polarization-entangled photon-pair source based on spontaneous parametric down conversion in an ultrathin rhombohedral tungsten disulfide (3R-WS
2
) crystal. This vdW entangled photonic source exhibits a high photon-pair purity with a coincidence-to-accidental ratio of above 800
a generation rate of 31 Hz
and two maximally polarization-entangled Bell states with fidelities exceeding 0.93 and entanglement degree over 0.97. These results stem from scalable optical nonlinearity
enhanced second-order susceptibility by electronic transitions
and a well-defined symmetry-enabled selection rule inherent in 3R-WS
2
. Our polarization entangled photon source can be integrated with photonic structures for generating more complex entangled states
thus paving an avenue for advanced quantum photonic systems toward computation and metrology.
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