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The two-way quantum time transfer method has been proposed and experimentallydemonstrated for its potential enhancements in precision and better guaranteeof security. To further testify its advantage in practical applications, theapplicable direct transmission distance as well as the achievablesynchronization precision between independent time scales is of great interest.In this paper, an experiment on two-way quantum time transfer has been carriedout over a 50 km long fiber link. With the common clock reference, a short-termstability of 2.6 ps at an averaging time of 7 s and a long-term stability of54.6 fs at 57300 s were obtained. With independent clock references, assistedby microwave frequency transfer technology, the achieved synchronization showedalmost equal performance and reached a stability of 89.5 fs at 57300 s.Furthermore, the spectral consistency of the utilized entangled photon pairsources has been studied concerning its effect on the transfer accuracy andlong-term stability. The results obtained have promised a bright future of thetwo-way quantum time transfer for realizing high-precision time synchronizationon metropolitan area fiber links.

Demonstration of 50 km Fiber-optic two-way quantum time transfer at femtosecond-scale precision