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

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, Andreas D. Wieck, Arne Ludwig, Da-Wei Wang, Chao-Yuan Jin and Feng Liu ()
Additional contact information
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
Chao-Yuan Jin: Zhejiang University
Feng Liu: Zhejiang University

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: 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.

Date: 2024
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DOI: 10.1038/s41467-024-50062-0

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