Photon pairs used to generate quantum keys over 48 km of deployed fiber simultaneously kept two rubidium clocks synchronized to within 12 ps, with no extra timing hardware.
Gr \"u nenfelder , author A
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Entanglement-based clock syntonization for quantum key distribution networks. Demonstration over a 50 km-long link
Photon pairs used to generate quantum keys over 48 km of deployed fiber simultaneously kept two rubidium clocks synchronized to within 12 ps, with no extra timing hardware.