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Quantum correlations of spontaneous two-photon emission from a quantum dot

Author

Listed:
  • Shunfa Liu

    (Sun Yat-sen University)

  • Yangpeng Wang

    (Sun Yat-sen University)

  • Yasser Saleem

    (TU Dortmund)

  • Xueshi Li

    (Sun Yat-sen University)

  • Hanqing Liu

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Cheng-Ao Yang

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Jiawei Yang

    (Sun Yat-sen University)

  • Haiqiao Ni

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Zhichuan Niu

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Yun Meng

    (Tianjin University
    Ministry of Education)

  • Xiaolong Hu

    (Tianjin University
    Ministry of Education)

  • Ying Yu

    (Sun Yat-sen University)

  • Xuehua Wang

    (Sun Yat-sen University
    Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area)

  • Moritz Cygorek

    (TU Dortmund)

  • Jin Liu

    (Sun Yat-sen University
    Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area)

Abstract

Spontaneous two-photon emission (STPE) is a second-order quantum radiation process with implications in astrophysics1, atomic physics2 and quantum technology3. In particular, on-demand STPE from single quantum emitters has long been predicted to revolutionize photonic quantum science and technology4,5. Here we report STPE with brightness comparable to that of competing single-photon radiation from a single semiconductor quantum dot deterministically coupled to a high-quality micropillar cavity. This is because of strong vacuum fluctuations in the microcavity, which drive a biexciton directly to the ground state. We show the quantum nature associated with STPE in the cavity quantum electrodynamics regime using photon statistics measurements. Furthermore, STPE is exploited to build unconventional entangled quantum light sources that can simultaneously achieve near-unity entanglement fidelity for spontaneous parametric down-conversion sources and on-demand photon emission for atomic quantum emitters. Our work provides insights into the two-photon process in the quantum regime, which could empower photonic quantum technology with nonlinear quantum radiation.

Suggested Citation

  • Shunfa Liu & Yangpeng Wang & Yasser Saleem & Xueshi Li & Hanqing Liu & Cheng-Ao Yang & Jiawei Yang & Haiqiao Ni & Zhichuan Niu & Yun Meng & Xiaolong Hu & Ying Yu & Xuehua Wang & Moritz Cygorek & Jin L, 2025. "Quantum correlations of spontaneous two-photon emission from a quantum dot," Nature, Nature, vol. 643(8074), pages 1234-1239, July.
    • Handle: RePEc:nat:nature:v:643:y:2025:i:8074:d:10.1038_s41586-025-09267-6
    DOI: 10.1038/s41586-025-09267-6
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