On-demand semiconductor source of entangled photons which simultaneously has high fidelity, efficiency, and indistinguishability
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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 bullseye cavity with broadband high Purcell factor 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 multi-photon experiments and solid-state quantum repeaters.
Wang , H , Hu , H , Chung , T -H , Qin , J , Yang , X , Li , J-P , Liu , R-Z , Zhong , H-S , He , Y-M , Ding , X , Deng , Y-H , Schneider , C , Dai , Q , Huo , Y-H , Höfling , S , Lu , C-Y & Pan , J-W 2019 , ' On-demand semiconductor source of entangled photons which simultaneously has high fidelity, efficiency, and indistinguishability ' , Physical Review Letters , vol. 122 , no. 11 , 113602 . https://doi.org/10.1103/PhysRevLett.122.113602
Physical Review Letters
Copyright © 2019 American Physical Society. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1103/PhysRevLett.122.113602
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