21 May 2015 Provably secure time distribution for the electric grid
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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.
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A. M. Smith, A. M. Smith, P. G. Evans, P. G. Evans, B. P. Williams, B. P. Williams, W. P. Grice, W. P. Grice, "Provably secure time distribution for the electric grid", Proc. SPIE 9500, Quantum Information and Computation XIII, 950007 (21 May 2015); doi: 10.1117/12.2178917; https://doi.org/10.1117/12.2178917

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