Entanglement-based clock syntonization for quantum key distribution networks. Demonstration over a 50 km-long link

• URL: http://arxiv.org/abs/2501.16796v1
• Date: Tue, 28 Jan 2025 08:56:13 GMT
• Title: Entanglement-based clock syntonization for quantum key distribution networks. Demonstration over a 50 km-long link
• Authors: Yoann Pelet, Grégory Sauder, Sébastien Tanzilli, Olivier Alibart, Anthony Martin,
• Abstract summary: We present the implementation of a time synchronization protocol as part of an experimentally deployed entanglement-based quantum key distribution link. The system is deployed over 48 km of optical fibers across the M'etropole Cote d'Azur. We exploit the time correlation of paired photons generated by a high-quality source of energy-time entanglement to synchronize two rubidium clocks located at the end stations.
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• Abstract: We present the implementation of a time synchronization protocol as part of an experimentally deployed entanglement-based quantum key distribution (QKD) link. The system is deployed over 48 km of optical fibers across the M\'etropole C\^ote d'Azur and enables secret cryptographic key exchange between two remote users, with an average rate of 7 kbps. We exploit the time correlation of paired photons generated by a high-quality source of energy-time entanglement implemented in the QKD link to synchronize two rubidium clocks located at the end stations. The level of stability achieved guarantees a time offset between the clocks under 12 ps at all time. We also show that this protocol requires less hardware than a typical synchronization protocol for QKD that would distribute a reference clock signal between the users.

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