Quantum repeater without Bell measurements in double-quantum-dot systems

  • Xiao-Feng YiEmail author
  • Peng Xu
  • Qi Yao
  • Xianfu Quan


We propose a Bell measurement-free scheme to implement a quantum repeater in GaAs/AlGaAs double-quantum-dot systems. We prove that four pairs of double quantum dots compose an entanglement unit, given that the initial state is singlet states. Our scheme differs from the famous Duan–Lukin–Cirac–Zoller (DLCZ) protocol in that Bell measurements are unnecessary for the entanglement swapping, which provides great advantages and conveniences in experimental implementations. Our scheme significantly improves the success probability of quantum repeaters based on solid-state quantum devices.


Entanglement swapping DLCZ protocol Double quantum dot Quantum repeater 



X. F. Yi thanks Wenxian Zhang, Mang Feng, Yong Zhang, Zhang-qi Yin, and Chao-Biao Zhou for valuable discussions. This work was supported by the National Natural Science Foundation of China under Grant No. 11574239 and Open Research Fund Program of the State Key Laboratory of Low-Dimensional Quantum Physics under Grant No. KF201614.


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Authors and Affiliations

  1. 1.School of Physics and TechnologyWuhan UniversityWuhanPeople’s Republic of China
  2. 2.State key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and MathematicsChinese Academy of SciencesWuhanPeople’s Republic of China
  3. 3.University of Chinese Academy of SciencesBeijingPeople’s Republic of China

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