Entanglement-verified time distribution in a metropolitan network
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arXiv
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| Autori principali: | , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866915928121278464 |
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| author | Alqedra, Mohammed K. Gyger, Samuel Zeuner, Katharina D. Lettner, Thomas Hammar, Mattias Llosera, Gemma Vall Zwiller, Val |
| author_facet | Alqedra, Mohammed K. Gyger, Samuel Zeuner, Katharina D. Lettner, Thomas Hammar, Mattias Llosera, Gemma Vall Zwiller, Val |
| contents | 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 $|Φ^+\rangle$ 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_00802 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Entanglement-verified time distribution in a metropolitan network Alqedra, Mohammed K. Gyger, Samuel Zeuner, Katharina D. Lettner, Thomas Hammar, Mattias Llosera, Gemma Vall Zwiller, Val Quantum Physics 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 $|Φ^+\rangle$ 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. |
| title | Entanglement-verified time distribution in a metropolitan network |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2504.00802 |