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<p>A multicarrier continuous-variable quantum key distribution (CVQKD) protocol uses subcarrier quantum states and subchannels for the transmission. Here, a subchannel estimation and subcarrier detection method is defined for multiuser multicarrier continuous-variable quantum key distribution. The subcarrier spreading technique estimates the transmittance conditions of the subchannels with a theoretical error-minimum in the presence of a Gaussian noise. We study the performance of the method and address the implementation framework.</p>

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Channel Estimation and Carrier Detection for Multiuser Multicarrier Continuous-Variable Quantum Key Distribution

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月9日

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  • Laszlo Gyongyosi,
  • Sandor Imre

摘要

A multicarrier continuous-variable quantum key distribution (CVQKD) protocol uses subcarrier quantum states and subchannels for the transmission. Here, a subchannel estimation and subcarrier detection method is defined for multiuser multicarrier continuous-variable quantum key distribution. The subcarrier spreading technique estimates the transmittance conditions of the subchannels with a theoretical error-minimum in the presence of a Gaussian noise. We study the performance of the method and address the implementation framework.