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<p>Quantum key distribution offers a high security process to guarantee secret exchange of cryptographic key between two distant partners. In order to ensure that the exchanged key is secure, a quantum bit error rate is calculated and monitored as to remain within certain limit. In this work, an experimental examination is performed to evaluate the performance of BB84 protocol. Two quantum channels were tested, free space and simulated sea water for different salts concentrations. The work is carried out through two stages, first stage is to check the polarization preservation of the simulated sea water, the second stage involves evaluating the system’s performance by calculating the QBER for the two quantum channels. The results indicated that polarization is preserved in the simulated seawater channel. The calculated QBER for the free space channel was 3%, while the highest QBER for the simulated seawater channel was 14.3%.</p>

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Performance evaluation of underwater BB84 protocol using various single photon counting modules

  • 期刊论文

  • 发表日期：

    2025年6月11日

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  • Ghada Qusai Ramzi,
  • Ahmed Ismael Khaleel

摘要

Quantum key distribution offers a high security process to guarantee secret exchange of cryptographic key between two distant partners. In order to ensure that the exchanged key is secure, a quantum bit error rate is calculated and monitored as to remain within certain limit. In this work, an experimental examination is performed to evaluate the performance of BB84 protocol. Two quantum channels were tested, free space and simulated sea water for different salts concentrations. The work is carried out through two stages, first stage is to check the polarization preservation of the simulated sea water, the second stage involves evaluating the system’s performance by calculating the QBER for the two quantum channels. The results indicated that polarization is preserved in the simulated seawater channel. The calculated QBER for the free space channel was 3%, while the highest QBER for the simulated seawater channel was 14.3%.