The present embodiment relates to a system, an apparatus, and a method of quantum frequency synchronization, and a method of quantum frequency synchronization for a clock. The method of quantum frequency synchronization, which is a method of quantum frequency synchronization within a network including a first device and a second device sharing a singlet state, comprises the following steps: determining whether desynchronization is performed according to a frequency drift based on the singlet state; and performing resynchronization based on a determination result of the desynchronization.;COPYRIGHT KIPO 2019
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