We demonstrate a quantum time distribution (QTD) method that combines the precision of optical timing techniques with the integrity of quantum key distribution (QKD). Critical infrastructure is dependent on microprocessor- and programmable logic-based monitoring and control systems. The distribution of timing information across the electric grid is accomplished by GPS signals which are known to be vulnerable to spoofing. We demonstrate a method for synchronizing remote clocks based on the arrival time of photons in a modified QKD system. This has the advantage that the signal can be verified by examining the quantum states of the photons similar to QKD.

Date Published: 21 May 2015
PDF: 4 pages
Proc. SPIE 9500, Quantum Information and Computation XIII, 950007 (21 May 2015); doi: 10.1117/12.2178917

Published in SPIE Proceedings Vol. 9500:
Quantum Information and Computation XIII
Eric Donkor; Andrew R. Pirich; Michael Hayduk, Editor(s)