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Wavelength-tunable high-fidelity entangled photon sources enabled by dual Stark effects

Author

Listed:
  • Chen Chen

    (Zhejiang University)

  • Jun-Yong Yan

    (Zhejiang University)

  • Hans-Georg Babin

    (Ruhr-Universität Bochum)

  • Jiefei Wang

    (Zhejiang University)

  • Xingqi Xu

    (Zhejiang University)

  • Xing Lin

    (Zhejiang University)

  • Qianqian Yu

    (Zhejiang Laboratory)

  • Wei Fang

    (Zhejiang University)

  • Run-Ze Liu

    (University of Science and Technology of China)

  • Yong-Heng Huo

    (University of Science and Technology of China)

  • Han Cai

    (Zhejiang University)

  • Wei E. I. Sha

    (Zhejiang University)

  • Jiaxiang Zhang

    (Chinese Academy of Sciences)

  • Christian Heyn

    (University of Hamburg)

  • Andreas D. Wieck

    (Ruhr-Universität Bochum)

  • Arne Ludwig

    (Ruhr-Universität Bochum)

  • Da-Wei Wang

    (Zhejiang University
    University of Chinese Academy of Sciences)

  • Chao-Yuan Jin

    (Zhejiang University)

  • Feng Liu

    (Zhejiang University)

Abstract

The construction of a large-scale quantum internet requires quantum repeaters containing multiple entangled photon sources with identical wavelengths. Semiconductor quantum dots can generate entangled photon pairs deterministically with high fidelity. However, realizing wavelength-matched quantum-dot entangled photon sources faces two difficulties: the non-uniformity of emission wavelength and exciton fine-structure splitting induced fidelity reduction. Typically, these two factors are not independently tunable, making it challenging to achieve simultaneous improvement. In this work, we demonstrate wavelength-tunable entangled photon sources based on droplet-etched GaAs quantum dots through the combined use of AC and quantum-confined Stark effects. The emission wavelength can be tuned by ~1 meV while preserving an entanglement fidelity f exceeding 0.955(1) in the entire tuning range. Based on this hybrid tuning scheme, we finally demonstrate multiple wavelength-matched entangled photon sources with f > 0.919(3), paving the way towards robust and scalable on-demand entangled photon sources for quantum internet and integrated quantum optical circuits.

Suggested Citation

  • Chen Chen & Jun-Yong Yan & Hans-Georg Babin & Jiefei Wang & Xingqi Xu & Xing Lin & Qianqian Yu & Wei Fang & Run-Ze Liu & Yong-Heng Huo & Han Cai & Wei E. I. Sha & Jiaxiang Zhang & Christian Heyn & And, 2024. "Wavelength-tunable high-fidelity entangled photon sources enabled by dual Stark effects," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-50062-0
    DOI: 10.1038/s41467-024-50062-0
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