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

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

doi:10.1587/elex.21.20240463

LETTER

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

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

Author information

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

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2024 Volume 21 Issue 19 Pages 20240463

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

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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 1.175kHz, 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 8µs loop delay.

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