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The two-way quantum clock synchronization has been shown not only providingfemtosecond-level synchronization capability but also security againstsymmetric delay attacks, thus becoming a prospective method to compare andsynchronize distant clocks with both enhanced precision and security. In thisletter, a field test of two-way quantum synchronization between a H-maser and aRb clock linked by a 7 km-long deployed fiber was implemented. Limited by thefrequency stability of the Rb clock, the achieved time stability at 30 s wasmeasured as 32 ps. By applying a fiber-optic microwave frequency transfertechnology, the stability was improved by more than one-magnitude to 1.9 ps,even though the number of acquired photon pairs was only 1440 in 30 s due tothe low sampling rate of the utilized coincidence measurement system. Suchimplementation demonstrates the high practicability of two-way quantum clocksynchronization method for promoting the field applications.

Implementation of field two-way quantum synchronization of distant clocks across a 7 km deployed fiber link