Absolute clock synchronization with a single time-correlated photon pair source over 10km

• URL: http://arxiv.org/abs/2009.04815v1
• Date: Wed, 9 Sep 2020 08:52:49 GMT
• Title: Absolute clock synchronization with a single time-correlated photon pair source over 10km
• Authors: Jianwei Lee, Lijiong Shen, Adrian Nugraha Utama, Christian Kurtsiefer
• Abstract summary: We show a point-to-point clock synchronization protocol based on bidirectionally propagating photons generated in a single spontaneous parametric down-conversion source. Tight timing correlations between photon pairs are used to determine the single and round-trip times measured by two separate clocks.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We demonstrate a point-to-point clock synchronization protocol based on bidirectionally propagating photons generated in a single spontaneous parametric down-conversion (SPDC) source. Tight timing correlations between photon pairs are used to determine the single and round-trip times measured by two separate clocks, providing sufficient information for distance-independent absolute synchronization secure against symmetric delay attacks. We show that the coincidence signature useful for determining the round-trip time of a synchronization channel, established using a 10\,km telecommunications fiber, can be derived from photons reflected off the end face of the fiber without additional optics. Our technique allows the synchronization of multiple clocks with a single reference clock co-located with the source, without requiring additional pair sources, in a client-server configuration suitable for synchronizing a network of clocks.

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