Qubit-Based Synchronization Algorithm for Measurement-Device-Independent Quantum Key Distribution

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Abstract
Measurement-device-independent quantum key distribution (MDI-QKD) is considered one of the most promising protocols due to its high performance and security. To implement the MDI-QKD system in practice, clock synchronization is a crucial step to correctly generate the secret keys. However, as practical applications advance, the complexity and cost of synchronization have become significant challenges for the implementation of MDI-QKD. In this study, we introduce a qubit-based synchronization algorithm specifically designed for MDI-QKD. By utilizing the property of Hong-Ou-Mandel interference, we achieve clock synchronization between parties of MDI-QKD without the need for additional hardware. The cost-effectiveness and simplicity of this approach are expected to significantly facilitate the practical deployment of MDI-QKD.
Funding Information
  • National Natural Science Foundation of China (62301524, 62425507, 62271463, 62105318, 61961136004, 62171424)
  • Fundamental Research Funds for the Central Universities
  • China Postdoctoral Science Foundation (2022M723064)
  • Natural Science Foundation of Anhui (2308085QF216)
  • Innovation Program for Quantum Science and Technology (2021ZD0300700)

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