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Quantum Physics

arXiv:2506.12882 (quant-ph)
[Submitted on 15 Jun 2025]

Title:Cascaded quantum time transfer breaking the no-cloning barrier with entanglement relay architecture

Authors:H. Hong, X. Xiang, R. Quan, B. Shi, Y. Liu, Z. Xia, T. Liu, X. Li, M. Cao, S. Zhang, K. Guo, R. Dong
View a PDF of the paper titled Cascaded quantum time transfer breaking the no-cloning barrier with entanglement relay architecture, by H. Hong and 11 other authors
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Abstract:Quantum two-way time transfer (Q-TWTT) leveraging energy-time entangled biphotons has achieved sub-picosecond stability but faces fundamental distance limitations due to the no-cloning theorem's restriction on quantum amplification. To overcome this challenge, we propose a cascaded Q-TWTT architecture employing relay stations that generate and distribute new energy-time entangled biphotons after each transmission segment. Theoretical modeling reveals sublinear standard deviation growth (merely N increase for N equidistant segments), enabling preservation of sub-picosecond stability over extended distances. We experimentally validate this approach using a three-station cascaded configuration over 200 km fiber segments, demonstrating strong agreement with theory. Utilizing independent Rb clocks at end and relay stations with online frequency skew correction, we achieve time stabilities of 3.82 ps at 10 s and 0.39 ps at 5120 s. The consistency in long-term stability between cascaded and single-segment configurations confirms high-precision preservation across modular quantum networks. This work establishes a framework for long-distance quantum time transfer that surpasses the no-cloning barrier, providing a foundation for future quantum-network timing infrastructure.
Subjects: Quantum Physics (quant-ph); Optics (physics.optics)
Cite as: arXiv:2506.12882 [quant-ph]
  (or arXiv:2506.12882v1 [quant-ph] for this version)
  https://doi.org/10.48550/arXiv.2506.12882
arXiv-issued DOI via DataCite

Submission history

From: Huibo Hong [view email]
[v1] Sun, 15 Jun 2025 15:26:50 UTC (6,618 KB)
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