On-Demand Semiconductor Source of Entangled Photons Which Simultaneously Has High Fidelity, Efficiency, and Indistinguishability

Hui Wang(Hefei National Center for Physical Sciences at Nanoscale), Hai Hu(National Center for Nanoscience and Technology), T.-H. Chung(University of Science and Technology of China), Jian Qin(CAS Key Laboratory of Urban Pollutant Conversion), Xiaoxia Yang(National Center for Nanoscience and Technology), Jian Li(University of Science and Technology of China), Runze Liu(CAS Key Laboratory of Urban Pollutant Conversion), Han-Sen Zhong(University of Science and Technology of China), Yu He(University of Science and Technology of China), Xing Ding(University of Science and Technology of China), Youjin Deng(Hefei National Center for Physical Sciences at Nanoscale), Qing Dai(National Center for Nanoscience and Technology), Yong-Heng Huo(CAS Key Laboratory of Urban Pollutant Conversion), Sven Höfling(University of St Andrews), Chao‐Yang Lu(Hefei National Center for Physical Sciences at Nanoscale), Jian-Wei Pan(CAS Key Laboratory of Urban Pollutant Conversion)
Physical Review Letters
March 22, 2019
10.1103/physrevlett.122.113602
Cited by 332Open Access
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Abstract

An outstanding goal in quantum optics and scalable photonic quantum technology is to develop a source that each time emits one and only one entangled photon pair with simultaneously high entanglement fidelity, extraction efficiency, and photon indistinguishability. By coherent two-photon excitation of a single InGaAs quantum dot coupled to a circular Bragg grating bull's-eye cavity with a broadband high Purcell factor of up to 11.3, we generate entangled photon pairs with a state fidelity of 0.90(1), pair generation rate of 0.59(1), pair extraction efficiency of 0.62(6), and photon indistinguishability of 0.90(1) simultaneously. Our work will open up many applications in high-efficiency multiphoton experiments and solid-state quantum repeaters.

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