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相关概念视频

BIBO stability of continuous and discrete -time systems01:24

BIBO stability of continuous and discrete -time systems

386
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....
386
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...
6.9K
Power System Distribution01:25

Power System Distribution

237
Power system distribution involves delivering electrical energy from power plants to consumers through a network of transmission and distribution systems. The process begins at power plants, where energy from coal, gas, nuclear, water, and wind is converted into electrical energy. These plants use three-phase generators, typically rated between 50 to 1300 MVA, with terminal voltages ranging from a few kV to 20 kV, depending on the size and age of the units.
The transmission system is designed...
237
Control of Power Flow01:30

Control of Power Flow

265
There are several methods to control power flow in power systems:
265
Power Factor Correction01:20

Power Factor Correction

172
The power transmission to a factory involves the transfer of apparent power, a combination of active and reactive power. The power factor measures how effectively electrical power is converted into useful work output. The ratio of the real power (KW) that does the work to the apparent power (KVA) supplied to the circuit.
172
Conservation of AC Power01:15

Conservation of AC Power

334
The principle of power preservation is applicable to both ac and dc circuits. This principle, when applied to AC power, asserts that the complex, real, and reactive powers produced by the source are equal to the total complex, real, and reactive powers absorbed by the loads. When two load impedances are connected in parallel to an ac source V, the complex power provided by the source can be calculated using the relation
334

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相关实验视频

Updated: Jun 27, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs
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基于芯片的连续变量量子密钥分配系统的高度稳定的功率控制.

Yiming Bian, Yang Li, Xuesong Xu

    Optics letters
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    PubMed
    概括
    此摘要是机器生成的。

    一种新的量子信号功率控制方法提高了基于芯片的连续变量量子密钥分配系统的稳定性. 这一突破通过防止高估秘密密钥率来提高安全性,为实际的量子通信铺平了道路.

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    相关实验视频

    Last Updated: Jun 27, 2025

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    科学领域:

    • 量子信息科学 量子信息科学
    • 综合光子学 综合光子学
    • 网络安全 网络安全

    背景情况:

    • 量子密钥分布 (QKD) 提供了信息理论上安全的密钥生成.
    • 基于芯片的QKD集成,特别是连续变量QKD (CV-QKD),对于小型化和大规模生产是可取的.
    • 现有的光子集成方法在稳定的量子信号功率控制方面扎,影响CV-QKD的性能和安全性.

    研究的目的:

    • 为CV-QKD开发和验证一种高度稳定的基于芯片的量子信号功率控制方案.
    • 解决光子集成中当前功率控制方法的局限性.
    • 提高芯片内CV-QKD系统的实际安全性和可靠性.

    主要方法:

    • 理论分析和实验实施使用偏向的马赫-泽恩德干扰仪的新型功率控制方案.
    • 使用标准的光子制造技术进行芯片集成.
    • 对系统稳定性和关键率准确性的模拟和实验验证.

    主要成果:

    • 提出的偏向的马赫-泽恩德干扰仪方案显著提高了量子信号功率控制的稳定性.
    • 实验结果表明,与传统设计相比,秘密密钥速率的标准偏差在一个数量级上被抑制.
    • 该方案有效地减轻了对秘密密钥率的高估,关闭了实际的安全漏洞.

    结论:

    • 开发的基于芯片的量子信号功率控制方案是实现高度稳定的CV-QKD系统的有希望和实用的解决方案.
    • 这一进步对于安全和广泛部署集成量子通信技术至关重要.
    • 这些发现为在光子集成电路上更强大,更安全的量子密钥分配铺平了道路.