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Proceedings Paper

Remote clock synchronization with entangled photon pairs (Conference Presentation)
Author(s): Christian Kurtsiefer; Jianwei Lee

Paper Abstract

Photon pairs generated in spontaneous parametric downconversion exhibit a strong correlation in time, which has been used to synchronize spatially separated clocks in the past in quantum key distribution implementations to a high accuracy. A symmetric version of this scheme can be used to allow for an absolute clock synchronization, and the entanglement properties of photons generated in spontaneous down conversion allows to strengthen the authenticity of the received signals through entanglement witnesses. Aspects of this time synchronization technique with respect to use in optical fibers and remaining vulnerabilities are discussed. [1] C. Ho, A. Lamas-Linares, and C. Kurtsiefer: Clock synchronization by remote detection of correlated photon pairs, New Journal of Physics 11, 045011 (2009). [2] J. Lee, L. Shen, A. Cerè, J. Troupe, A. Lamas-Linares, C. Kurtsiefer: Symmetrical clock synchronization with time-correlated photon pairs, Appl. Phys. Lett. 114, 101102 (2019).

Paper Details

Date Published: 10 September 2019
Proc. SPIE 11091, Quantum Nanophotonic Materials, Devices, and Systems 2019, 110910X (10 September 2019); doi: 10.1117/12.2531739
Show Author Affiliations
Christian Kurtsiefer, Ctr. for Quantum Technologies (Singapore)
Jianwei Lee, Ctr. for Quantum Technologies (Singapore)

Published in SPIE Proceedings Vol. 11091:
Quantum Nanophotonic Materials, Devices, and Systems 2019
Cesare Soci; Matthew T. Sheldon; Mario Agio, Editor(s)

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