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相关概念视频

Propagation Speed of Electromagnetic Waves01:30

Propagation Speed of Electromagnetic Waves

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Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as:
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Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

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The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
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BIBO stability of continuous and discrete -time systems01:24

BIBO stability of continuous and discrete -time systems

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System stability is a fundamental concept in signal processing, often assessed using convolution. For a system to be considered bounded-input bounded-output (BIBO) stable, any bounded input signal must produce a bounded output signal. A bounded input signal is one where the modulus does not exceed a certain constant at any point in time.
To determine the BIBO stability, the convolution integral is utilized when a bounded continuous-time input is applied to a Linear Time-Invariant (LTI) system....
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¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

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When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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Continuous Charge Distributions01:17

Continuous Charge Distributions

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Imagine a bucket of water. It contains many molecules, of the order of 1026 molecules. Thus, although it contains discrete elements (molecules) at the microscopic level, macroscopically, it can be considered continuous. Small volume elements of water, infinitesimal compared to the bulk of the bucket's volume, still contain many molecules. Under this framework, quantized matter is approximated as continuous for practical purposes.
The electric charge can also be subjected to an analogical...
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Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

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A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
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相关实验视频

Updated: Feb 21, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

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在高速极化干扰下,用于连续变量量子密钥分布的自适应符号CMA.

Si Qiu, Yan Tian, Shaobo Ren

    Optics express
    |February 20, 2026
    PubMed
    概括

    这项研究引入了一个自适应符号恒定模量算法 (AS-CMA) 来对抗光纤中极化干扰. 这种新方法确保了量子通信的强大的极化恢复,即使在极端条件下.

    科学领域:

    • 光学和光子学 在光学和光子学.
    • 量子信息科学 量子信息科学
    • 电信工程 电信工程 电信工程

    背景情况:

    • 长途单模光纤电缆中的极化波动会破坏经典和量子通信系统.
    • 保持信号完整性对于安全的数据传输至关重要,特别是在量子密钥分布 (QKD) 中.

    研究的目的:

    • 开发一种高效且低复杂度的算法,用于光纤系统中的极化恢复.
    • 提高连续变量量子密钥分布 (CV-QKD) 系统的性能和弹性,以应对极化干扰.

    主要方法:

    • 提出一个自适应符号恒定模量算法 (AS-CMA) 与一个以错误驱动的自适应步骤大小.
    • 实施基于符号的权重更新机制,以减少与传统CMA相比的计算复杂性.
    • 在模拟的连续变量量子密钥分布 (CV-QKD) 系统中验证AS-CMA算法.

    主要成果:

    • 在模拟的极化干扰率下,AS-CMA在25公里的单模光纤上显示出高达10Mrad/s的强大的极化恢复,秘密密钥速率仅下降了12.9%.
    • 该算法即使在43Mrad/s的极端短暂干扰下也保持了正的秘密密钥速率,模拟闪电事件.
    • 与传统的CMA方法相比,计算复杂性得到了显著的减少.

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    Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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    Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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    Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

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    Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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    结论:

    • 在CV-QKD系统中,AS-CMA提供了一种高效且计算成本低廉的解决方案,用于在CV-QKD系统中恢复极化.
    • 这种算法提高了通过远距离光纤链路运行的量子通信网络的可靠性和安全性.
    • 在未来的安全通信基础设施中,AS-CMA显示出实际实施的希望.