FPGA-based phase-compensation of two independent lasers in a field experiment of quantum repeater

Jiang Jinwei; Wang Bowei; Ji Wenchao; Fu Tianhong; Yan Jiarong; Hong Ye; Qin Dandan; Hu Yi; Jiang Xiao

doi:10.1587/elex.21.20240463

This article has now been updated. Please use the final version.

FPGA-based phase-compensation of two independent lasers in a field experiment of quantum repeater

Jiang Jinwei, Wang Bowei, Ji Wenchao, Fu Tianhong, Yan Jiarong, Hong Ye, Qin Dandan, Hu Yi, Jiang Xiao

Author information

Jiang Jinwei
Hefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences, University of Science and Technology of China
CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China
Hefei National Laboratory, University of Science and Technology of China
Wang Bowei
Hefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences, University of Science and Technology of China
CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China
Hefei National Laboratory, University of Science and Technology of China
Ji Wenchao
Hefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences, University of Science and Technology of China
CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China
Hefei National Laboratory, University of Science and Technology of China
Fu Tianhong
Hefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences, University of Science and Technology of China
CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China
Hefei National Laboratory, University of Science and Technology of China
Yan Jiarong
Hefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences, University of Science and Technology of China
CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China
Hefei National Laboratory, University of Science and Technology of China
Hong Ye
Hefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences, University of Science and Technology of China
CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China
Hefei National Laboratory, University of Science and Technology of China
Qin Dandan
Hefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences, University of Science and Technology of China
CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China
Hefei National Laboratory, University of Science and Technology of China
Hu Yi
Hefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences, University of Science and Technology of China
CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China
Hefei National Laboratory, University of Science and Technology of China
Jiang Xiao
Hefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences, University of Science and Technology of China
CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China
Hefei National Laboratory, University of Science and Technology of China

Keywords: Quantum repeater, Independent laser interference, Analysis of laser phase noise, Photon phase locked

JOURNAL FREE ACCESS Advance online publication

Article ID: 21.20240463

DOI https://doi.org/10.1587/elex.21.20240463

The final version of this article is now available: Vol. 21 (2024), No. 19 pp. 20240463-20240463

Details

Abstract

A phase-locking system is designed and developed to measure and compensate for the phase fluctuations in real time at an intermediate node. The performance of the compensated feedback loop is theoretically analyzed and simulated. Radio frequency generators and mixer emulate the lasers and interference plus photon counting processes to perform closed-loop verification without lasers. When the sum of the linewidths of the two emulated lasers is 1.175 kHz, the interference root-mean-square phase noise is suppressed from 1626° to 30°. A closed-loop phase noise of approximately 13° is expected for field experiments with the same laser linewidth and loop delay.

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