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量子密钥分布和光学通信与多核光纤上的放大器的共存
Weiwen Kong1, Yongmei Sun1, Yaoxian Gao1
1The State Key Laboratory of Information Photonics and Optical Communications, School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China.
Nanophotonics (Berlin, Germany)
|December 5, 2024
概括
本研究研究了在多核光纤上的量子密钥分布 (QKD) 中的经典信号干扰. 在模拟中,不对称发送或不发送QKD (SNS-QKD) 与贝内特-布拉萨德1984-QKD (BB84-QKD) 相比显示出更高的性能.
科学领域:
- 量子信息科学 量子信息科学
- 光学通信是指光学通信.
- 光纤光学是指光纤的使用.
背景情况:
- 量子密钥分布 (QKD) 易受光纤中经典信号干扰的影响.
- 光学放大器引入噪声,进一步使QKD性能复杂化.
- 多核光纤 (MCF) 提供了同时传输经典和量子信号的潜力.
研究的目的:
- 分析经典信号对光学放大器在MCF中的QKD性能的影响.
- 建议和评估用于同时传输古典和QKD的新型架构.
- 开发噪声源的理论模型,并确保关键率计算.
主要方法:
- 建议的同时传输架构:不对称的发送或不发送QKD (SNS-QKD) 和贝内特-布拉萨德1984-QKD (BB84-QKD).
- 开发了自发拉曼散射和四波混合噪声的理论模型.
- 导出了考虑到经典信号诱导噪声的安全密钥率计算模型.
- 进行实验以验证理论模型和模拟结果.
主要成果:
- 理论模型准确地预测了实验噪声光子水平 (最大差异<2.6dB).
- 不对称的SNS-QKD架构表现出比BB84-QKD更高的性能.
- 对光学放大器的最佳细分长度被证明是可调的.
结论:
- 经典信号在MCF中显著影响QKD性能.
- 不对称的SNS-QKD架构比BB84-QKD对经典干扰更强大.
- 精确的噪声建模对于优化混合光纤网络中的QKD系统至关重要.
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