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.
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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.