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相关概念视频

Intensity Of Electromagnetic Waves01:22

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The energy transport per unit area per unit time, or the Poynting vector, gives the energy flux of an electromagnetic wave at any specific time. For a plane electromagnetic wave with E0 and B0 as the peak electric and magnetic fields and traveling along the x-axis, the time-varying energy flux can be given by the following equation:
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In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
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James Clerk Maxwell formulated a single theory combining all the electric and magnetic effects scientists knew during that time, calling the phenomena his theory predicted “Electromagnetic waves”. He brought together all the work that had been done by brilliant physicists such as Oersted, Coulomb, Gauss, and Faraday and added his own insights to develop the overarching theory of electromagnetism. Maxwell’s equations, combined with the Lorentz force law, encompass all the laws...
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When two waves of the same nature occur in the same region simultaneously, they result in interference. Interference of waves implies that the net effect of the waves is the sum of the individual waves' effects. However, it does not imply that the individual waves affect the propagation of other waves.
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Discrete-time Fourier transform01:26

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The Discrete-Time Fourier Transform (DTFT) is an essential mathematical tool for analyzing discrete-time signals, converting them from the time domain to the frequency domain. This transformation allows for examining the frequency components of discrete signals, providing insights into their spectral characteristics. In the DTFT, the continuous integral used in the continuous-time Fourier transform is replaced by a summation to accommodate the discrete nature of the signal.
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相关实验视频

Updated: Jun 23, 2025

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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水下波长攻击离散调制的连续变量量子密钥分布.

Kangyi Feng1, Yijun Wang1, Yin Li1

  • 1School of Automation, Central South University, Changsha 410083, China.

Entropy (Basel, Switzerland)
|June 26, 2024
PubMed
概括
此摘要是机器生成的。

这项研究介绍了用于水下量子密钥分配的波长攻击方案,使窃听者能够通过操纵光束分割器来窃取更多的秘密密钥. 该攻击利用蓝绿波段的波长依赖性属性来加强安全漏洞.

关键词:
连续变量的量子密钥分布分散调制的分离调制.在水下潜水,水下潜水是什么?攻击波长的攻击波长.

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相关实验视频

Last Updated: Jun 23, 2025

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科学领域:

  • 量子信息科学 量子信息科学
  • 光学通信的安全性 光学通信的安全性
  • 水下网络 水下网络

背景情况:

  • 连续变量量子密钥分布 (CV-QKD) 对于安全通信至关重要.
  • 波长攻击利用光束分割器的波长依赖性来破坏CV-QKD.
  • 水下通道对于安全的通信至关重要,但对于QKD安全性来说却不那么被探索.

研究的目的:

  • 提出和分析离散调制 (DM) CV-QKD在水下流道中的波长攻击方案.
  • 为了研究这些攻击的有效性,并没有局部振荡器 (LO) 强度监测器.
  • 为了确定窃听者可以最大限度地窃取钥匙的条件.

主要方法:

  • 开发了两种针对水下DM-CV-QKD的新型波长攻击方案.
  • 利用了聚合双圆形圆 (FBT) 束分离器的波长依赖的传导性能.
  • 为Eve的脉冲操纵确定了特定的蓝绿波长.
  • 根据道传输率和估计的过量噪声,推导出了攻击的成功标准.

主要成果:

  • 两种拟议的波长攻击方案都有效地将爱丽丝和勃估计的过量噪声降低到零.
  • 攻击的成功取决于根据通道传输率选择适当的条件参数.
  • 数字分析证实,将估计的过量噪音降到最低,允许Eve窃取更多的秘密密钥.

结论:

  • 波长攻击对水下离散调制CV-QKD系统构成重大威胁.
  • 拟议的方案在带有和没有LO强度监测器的两个场景中都是有效的.
  • 安全的水下量子通信需要对此类波长依赖的攻击采取对策.