Symmetrical clock synchronization with time-correlated photon pairs

Symmetrical clock synchronization with time-correlated photon pairs

We demonstrate a point-to-point clock synchronization protocol based on bidirectionally exchanging photons produced in spontaneous parametric down conversion (SPDC). The technique exploits tight timing correlations between photon pairs to achieve a precision of 51ps in 100s with count rates of order...

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Hauptverfasser: Lee, Jianwei, Shen, Lijiong, Cerè, Alessandro, Troupe, James, Lamas-Linares, Antia, Kurtsiefer, Christian
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Physics - Quantum Physics
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Shen, Lijiong
Cerè, Alessandro
Troupe, James
Lamas-Linares, Antia
Kurtsiefer, Christian
description We demonstrate a point-to-point clock synchronization protocol based on bidirectionally exchanging photons produced in spontaneous parametric down conversion (SPDC). The technique exploits tight timing correlations between photon pairs to achieve a precision of 51ps in 100s with count rates of order 200s$^{-1}$. The protocol is distance independent, secure against symmetric delay attacks and provides a natural complement to techniques based on Global Navigation Satellite Systems (GNSS). The protocol works with mobile parties and can be augmented to provide authentication of the timing signal via a Bell inequality check.
doi_str_mv 10.48550/arxiv.1812.08450
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title Symmetrical clock synchronization with time-correlated photon pairs
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