High-Dimensional Bell Test without Detection Loophole

Xiao-Min Hu, Chao Zhang, Bi-Heng Liu, Yu Guo, Wen-Bo Xing, Cen-Xiao Huang, Yun-Feng Huang, Chuan-Feng Li, and Guang-Can Guo
Phys. Rev. Lett. 129, 060402 – Published 3 August 2022
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Abstract

Violation of Bell’s inequalities shows strong conflict between quantum mechanics and local realism. Loophole-free Bell tests not only deepen understanding of quantum mechanics, but are also important foundations for device-independent (DI) tasks in quantum information. High-dimensional quantum systems offer a significant advantage over qubits for closing the detection loophole. In the symmetric scenario, a detection efficiency as low as 61.8% can be tolerated using four-dimensional states and a four-setting Bell inequality [Phys. Rev. Lett. 104, 060401 (2010)]. For the first time, we show that four-dimensional entangled photons violate a Bell inequality while closing the detection loophole in experiment. The detection efficiency of the four-dimensional entangled source is about 71.7%, and the fidelity of the state is 0.995±0.001. Combining the technique of multicore fibers, the realization of loophole-free high-dimensional Bell tests and high-dimensional quantum DI technologies are promising.

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  • Received 29 July 2021
  • Revised 1 April 2022
  • Accepted 15 July 2022

DOI:https://doi.org/10.1103/PhysRevLett.129.060402

© 2022 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & TechnologyGeneral Physics

Authors & Affiliations

Xiao-Min Hu*, Chao Zhang*, Bi-Heng Liu, Yu Guo, Wen-Bo Xing, Cen-Xiao Huang, Yun-Feng Huang, Chuan-Feng Li, and Guang-Can Guo

  • CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, 230026, China; CAS Center For Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, 230026, China and Hefei National Laboratory, University of Science and Technology of China, Hefei 230088, China

  • *X.-M. H. and C. Z. contributed equally to this work.
  • bhliu@ustc.edu.cn
  • cfli@ustc.edu.cn

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Issue

Vol. 129, Iss. 6 — 5 August 2022

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