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Abstract <p>The results of examination of the effect of ac magnetic fields on a multi-core fiber and the induced polarization distortions of signals propagating through different fiber cores are reported. A strong cross correlation of polarization distortions in different cores of a multi-core fiber is established. An approach is proposed for compensating rapid and chaotic changes in the polarization states of single photons induced by electromagnetic fields on a multi-core fiber telecommunication cable. The proposed approach is based on measuring polarization distortions of a classical communication channel in one of the multi-core fiber cores and compensating for these distortions in a quantum channel within the time interval established using a delay line through which the multi-core fiber cores with implemented quantum communication channels are connected. The need for careful stabilization of the characteristics of a polarization distortion compensation system, which will be connected immediately after mating the multi-core fiber with a conventional single-mode fiber (at constant temperature and without strong external fields) is demonstrated.</p>

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Possibility of Reducing the Destructive Effect of External Electromagnetic Fields on the Quantum Key Distribution in an Optical Fiber

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • S. Yu. Kazantsev,
  • A. K. Nanidzhanyan,
  • A. V. Bakhus,
  • M. A. Yarygin

摘要

Abstract

The results of examination of the effect of ac magnetic fields on a multi-core fiber and the induced polarization distortions of signals propagating through different fiber cores are reported. A strong cross correlation of polarization distortions in different cores of a multi-core fiber is established. An approach is proposed for compensating rapid and chaotic changes in the polarization states of single photons induced by electromagnetic fields on a multi-core fiber telecommunication cable. The proposed approach is based on measuring polarization distortions of a classical communication channel in one of the multi-core fiber cores and compensating for these distortions in a quantum channel within the time interval established using a delay line through which the multi-core fiber cores with implemented quantum communication channels are connected. The need for careful stabilization of the characteristics of a polarization distortion compensation system, which will be connected immediately after mating the multi-core fiber with a conventional single-mode fiber (at constant temperature and without strong external fields) is demonstrated.