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

Run-Ze Liu; Yu-Kun Qiao; Han-Sen Zhong; Zhen-Xuan Ge; Hui Wang; Tung-Hsun Chung; Chao-Yang Lu; Yong-Heng Huo; Jian-Wei Pan

doi:10.1016/j.scib.2023.03.022

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

Sci Bull (Beijing). 2023 Apr 30;68(8):807-812. doi: 10.1016/j.scib.2023.03.022. Epub 2023 Mar 16.

Authors

Run-Ze Liu¹, Yu-Kun Qiao¹, Han-Sen Zhong¹, Zhen-Xuan Ge¹, Hui Wang¹, Tung-Hsun Chung², Chao-Yang Lu³, Yong-Heng Huo⁴, Jian-Wei Pan³

Affiliations

¹ Hefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China; Shanghai Research Center for Quantum Science and CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315, China.
² Hefei National Laboratory, University of Science and Technology of China, Hefei 230088, China.
³ Hefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China; Shanghai Research Center for Quantum Science and CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315, China; Hefei National Laboratory, University of Science and Technology of China, Hefei 230088, China.
⁴ Hefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China; Shanghai Research Center for Quantum Science and CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315, China; Hefei National Laboratory, University of Science and Technology of China, Hefei 230088, China. Electronic address: yongheng@ustc.edu.cn.

PMID: 36990872
DOI: 10.1016/j.scib.2023.03.022

Abstract

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.

Keywords: Entangled photon source; Microcavity; Quantum information; Quantum interference; Single quantum dot.