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相关概念视频

Maximum Power Transfer01:16

Maximum Power Transfer

301
Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
By substituting the entire circuit with...
301
Discrete-time Fourier transform01:26

Discrete-time Fourier transform

395
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.
One of the notable...
395
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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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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Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

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Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short...
68
Discrete Fourier Transform01:15

Discrete Fourier Transform

340
The Discrete Fourier Transform (DFT) is a fundamental tool in signal processing, extending the discrete-time Fourier transform by evaluating discrete signals at uniformly spaced frequency intervals. This transformation converts a finite sequence of time-domain samples into frequency components, each representing complex sinusoids ordered by frequency. The DFT translates these sequences into the frequency domain, effectively indicating the magnitude and phase of each frequency component present...
340

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相关实验视频

Updated: Jul 28, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

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Published on: June 8, 2018

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高性能远程离散调制连续变量的量子密钥分布.

Yan Tian, Yu Zhang, Shuaishuai Liu

    Optics letters
    |June 1, 2023
    PubMed
    概括

    这项研究证明了使用一个小星座在80公里光纤上的高速连续变量量子密钥分布. 数字信号处理有效地抑制了噪声,从而实现了实用的远距离量子通信.

    科学领域:

    • 量子信息科学 量子信息科学
    • 光学通讯是指光学通讯.

    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.
    • 在长距离的标准光纤上实现高度机密的密钥速率仍然是一个挑战.

    研究的目的:

    • 为了证明一个高速率,离散调制的CV-QKD系统.
    • 为了研究使用小星座大小来提高性能的可行性.

    主要方法:

    • 使用2.5Gbaud,16符号,两环星座的CV-QKD的实验演示.
    • 实施先进的数字信号处理算法以减轻系统噪声.

    主要成果:

    • 实现了 49.02 Mbits/s (25 公里),11.86 Mbits/s (50 公里) 和 2.11 Mbits/s (80 公里) 的秘密密钥速率.
    • 高斯调制协议的性能达到66.570.0%,证明了效率.
    • 通过数字信号处理成功抑制过量噪音.

    结论:

    • 一个高性能,长距离的CV-QKD系统是可行的一个小的星座大小.
    • 离散调制的CV-QKD为安全的光通信网络提供了一种实用方法.

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