Entanglement-verified time distribution in a metropolitan network

[2504.00802] Entanglement-verified time distribution in a metropolitan network Skip to main content Search Submit Donate Log in Search arXiv Press Enter to search · Advanced search Quantum Physics arXiv:2504.00802 (quant-ph) [Submitted on 1 Apr 2025] Title: Entanglement-verified time distribution in a metropolitan network Authors: Mohammed K. Alqedra , Samuel Gyger , Katharina D. Zeuner , Thomas Lettner , Mattias Hammar , Gemma Vall Llosera , Val Zwiller View a PDF of the paper titled Entanglement-verified time distribution in a metropolitan network, by Mohammed K. Alqedra and 6 other authors View PDF HTML (experimental) Abstract: The precise synchronization of distant clocks is a fundamental requirement for a wide range of applications. Here, we experimentally demonstrate a novel approach of quantum clock synchronization utilizing entangled and correlated photon pairs generated by a quantum dot at telecom wavelength. By distributing these entangled photons through a metropolitan fiber network in the Stockholm area and measuring the remote correlations, we achieve a synchronization accuracy of tens of picoseconds by leveraging the tight time correlation between the entangled photons. We show that our synchronization scheme is secure against spoofing attacks by performing a remote quantum state tomography to verify the origin of the entangled photons. We measured a distributed maximum entanglement fidelity of $0.817 \pm 0.040$ to the $|\Phi^+\rangle$ Bell state and a concurrence of $0.660 \pm 0.086$. These results highlight the potential of quantum dot-generated entangled pairs as a shared resource for secure time synchronization and quantum key distribution in real-world quantum networks. Comments: 13 pages, 3 figures Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2504.00802 [quant-ph] (or arXiv:2504.00802v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2504.00802 Focus to learn more arXiv-issued DOI via DataCite Journal reference: Optica Quantum 4, 31-37 (2026) Related DOI : https://doi.org/10.1364/OPTICAQ.571619 Focus to learn more DOI(s) linking to related resources Submission history From: Mohammed K. Alqedra [ view email ] [v1] Tue, 1 Apr 2025 13:57:11 UTC (4,206 KB) Full-text links: Access Paper: View a PDF of the paper titled Entanglement-verified time distribution in a metropolitan network, by Mohammed K. Alqedra and 6 other authors View PDF HTML (experimental) TeX Source view license Current browse context: quant-ph < prev | next > new | recent | 2025-04 References & Citations INSPIRE HEP NASA ADS Google Scholar Semantic Scholar export BibTeX citation Loading... BibTeX formatted citation × loading... Data provided by: Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer ( What is the Explorer? ) Connected Papers Toggle Connected Papers ( What is Connected Papers? ) Litmaps Toggle Litmaps ( What is Litmaps? ) scite.ai Toggle scite Smart Citations ( What are Smart Citations? ) Code, Data, Media Code, Data and Media Associated with this Article alphaXiv Toggle alphaXiv ( What is alphaXiv? ) Links to Code Toggle CatalyzeX Code Finder for Papers ( What is CatalyzeX? ) DagsHub Toggle DagsHub ( What is DagsHub? ) GotitPub Toggle Gotit.pub ( What is GotitPub? ) Huggingface Toggle Hugging Face ( What is Huggingface? ) ScienceCast Toggle ScienceCast ( What is ScienceCast? ) Demos Demos Replicate Toggle Replicate ( What is Replicate? ) Spaces Toggle Hugging Face Spaces ( What is Spaces? ) Spaces Toggle TXYZ.AI ( What is TXYZ.AI? ) Related Papers Recommenders and Search Tools Link to Influence Flower Influence Flower ( What are Influence Flowers? ) Core recommender toggle CORE Recommender ( What is CORE? ) Author Venue Institution Topic About arXivLabs arXivLabs: experimental projects with community collaborators arXivLabs is a framework that allows collaborators to develop and share new arXiv features directly on our website. Both individuals and organizations that work with arXivLabs have embraced and accepted our values of openness, community, excellence, and user data privacy. arXiv is committed to these values and only works with partners that adhere to them. Have an idea for a project that will add value for arXiv's community? Learn more about arXivLabs . Which authors of this paper are endorsers? | Disable MathJax ( What is MathJax? ) We gratefully acknowledge support from our major funders , member institutions , , and all contributors. About · Help · Contact · Subscribe · Copyright · Privacy · Accessibility · Operational Status (opens in new tab) Major funding support from

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