Eliminating temporal correlation in quantum-dot entangled photon source by quantum interference

[Display omitted] Semiconductor quantum dots, as promising solid-state platform, have exhibited deterministic photon pair generation with high polarization entanglement fidelity for quantum information applications. However, due to temporal correlation from inherently cascaded emission, photon indis...

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Bibliographic Details
Published in:Science bulletin (Beijing) 2023-04, Vol.68 (8), p.807-812
Main Authors: Liu, Run-Ze, Qiao, Yu-Kun, Zhong, Han-Sen, Ge, Zhen-Xuan, Wang, Hui, Chung, Tung-Hsun, Lu, Chao-Yang, Huo, Yong-Heng, Pan, Jian-Wei
Format: Article
Language:English
Subjects:
Entangled photon source
Microcavity
Quantum information
Quantum interference
Single quantum dot
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Summary:[Display omitted] Semiconductor quantum dots, as promising solid-state platform, have exhibited deterministic photon pair generation with high polarization entanglement fidelity for quantum information applications. However, due to temporal correlation from inherently cascaded emission, photon indistinguishability is limited, which restricts their potential scalability to multi-photon experiments. Here, by utilizing quantum interferences to decouple polarization entanglement from temporal correlation, we improve four-photon Greenberger–Horne–Zeilinger (GHZ) state entanglement fidelity from (58.7±2.2)% to (75.5±2.0)%. Our work paves the way to realize scalable and high-quality multi-photon states from quantum dots.
ISSN:2095-9273
DOI:10.1016/j.scib.2023.03.022