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

• URL: http://arxiv.org/abs/2109.00784v2
• Date: Fri, 24 Dec 2021 07:53:01 GMT
• Title: Implementation of field two-way quantum synchronization of distant clocks across a 7 km deployed fiber link
• Authors: Runai Quan, Huibo Hong, Wenxiang Xue, Honglei Quan, Wenyu Zhao, Xiao Xiang, Yuting Liu, Mingtao Cao, Tao Liu, Shougang Zhang, Ruifang Dong
• Abstract summary: A field test of two-way quantum synchronization between a H-maser and a Rb clock linked by a 7 km-long deployed fiber was implemented. 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.
• Score: 3.6570312017753084
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The two-way quantum clock synchronization has been shown not only providing femtosecond-level synchronization capability but also security against symmetric delay attacks, thus becoming a prospective method to compare and synchronize distant clocks with both enhanced precision and security. In this letter, a field test of two-way quantum synchronization between a H-maser and a Rb clock linked by a 7 km-long deployed fiber was implemented. Limited by the frequency stability of the Rb clock, the achieved time stability at 30 s was measured as 32 ps. By applying a fiber-optic microwave frequency transfer technology, 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 to the low sampling rate of the utilized coincidence measurement system. Such implementation demonstrates the high practicability of two-way quantum clock synchronization method for promoting the field applications.

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