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Energy-time entanglement coexisting with fiber-optical communication in the telecom C band

Yun-Ru Fan1, Yue Luo1, Zi-Chang Zhang1, Yun-Bo Li2, Sheng Liu2, Dong Wang2, De-Chao Zhang2, Guang-Wei Deng1, You Wang1,3 et al.

Hai-Zhi Song1,3, Zhen Wang4, Li-Xing You4, Chen-Zhi Yuan1,*, Guang-Can Guo1,5, and Qiang Zhou1,5,†

  • 1Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, China
  • 2Department of Fundamental Network Technology, China Mobile Research Institute, Beijing 100053, China
  • 3Southwest Institute of Technical Physics, Chengdu 610041, China
  • 4Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
  • 5CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China

  • *c.z.yuan@uestc.edu.cn
  • †zhouqiang@uestc.edu.cn
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Phys. Rev. A 108, L020601 – Published 24 August, 2023

DOI: https://doi.org/10.1103/PhysRevA.108.L020601

Abstract

We study the coexistence of energy-time entanglement with fiber-optical communication in the telecom C band. The property of noise from wavelength-multiplexed classical channels is characterized with different wavelength settings. With the largest noise, i.e., the worst case, we measure the entanglement property of the distributed energy-time entangled photon pairs at different data rates of fiber-optical communication. After being distributed over 40-km spooled fiber coexisting with a bidirectional data rate of 20 Gbps, a visibility of 82.01±1.10% is obtained by measuring the Franson interference. With the Bennett-Brassard-Mermin 1992 (BBM92) protocol, a secret key rate of 343 bits per second is reached over the 40-km spooled fiber coexisting with a bidirectional data rate of 10 Gbps. Our result paves the way for developing a cost-effective quantum entanglement network compatible with fiber communication systems.

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Phys. Rev. A 108, L020601– Published 24 August, 2023
  • Received 25 May 2023
  • Accepted 11 August 2023
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