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相关概念视频

Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

115
Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...
115

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相关实验视频

Updated: Jul 16, 2025

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
00:07

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Published on: September 5, 2019

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使用基于萨格纳克的光学和兼容的电子设备的时隔阶段编码量子密钥分布.

Yan-Lin Tang, Chun Zhou, Dong-Dong Li

    Optics express
    |September 15, 2023
    PubMed
    概括
    此摘要是机器生成的。

    我们使用萨格纳克干扰仪开发了一种稳定的定时区阶段编码量子密钥分布 (QKD) 系统. 这种灵活,高性能的QKD方案实现了高达6.2 kbps的安全关键速率,并证明了长期的稳定性.

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    相关实验视频

    Last Updated: Jul 16, 2025

    A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
    00:07

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    Published on: September 5, 2019

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

    Generation and Coherent Control of Pulsed Quantum Frequency Combs

    Published on: June 8, 2018

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    Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
    09:23

    Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

    Published on: May 30, 2014

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    科学领域:

    • 量子信息科学 量子信息科学
    • 量子密码学 量子密码学
    • 光学通信系统 光学通信系统

    背景情况:

    • 量子密钥分布 (QKD) 通过利用量子力学原理提供安全的通信.
    • 现有的QKD方案经常面临环境稳定性和复杂的校准要求的挑战.
    • 时间桶编码是一个有前途的QKD协议,但其实际实施需要强大而稳定的设置.

    研究的目的:

    • 引入一种新的定时区分阶段编码量子密钥分配 (QKD) 系统.
    • 证明一个本质上稳定且对环境干扰不敏感的QKD方案.
    • 展示这种新的QKD方法的实际性能和适用性.

    主要方法:

    • 使用具有固有稳定的萨格纳克型干扰仪的发射器进行时间相位编码.
    • 采用一个紧的QKD系统进行实验验证.
    • 使用可变光学减弱器模拟通道损失,以评估不同条件下的性能.
    • 在120公里的光纤线圈上进行了为期9天的连续测试.

    主要成果:

    • 在20dB的频道损失下实现了6.2kbps的安全密钥速率,在30dB的频道损失下达到0.4kbps.
    • 在120公里的光纤线圈上,在9天的时间内,表现出稳定的量子比特错误率 (QBER) 在0.4%0.6%的时间区基础上.
    • 该系统需要与现有的极化或相位编码方案相似的电能,不需要强度校准.

    结论:

    • 本文所介绍的时间阶段编码QKD方案提供了固有的稳定性和高性能.
    • 基于萨格纳克干扰仪的方法消除了对强度校准的需求,并降低了对环境因素的敏感性.
    • 这种强大且兼容的QKD方案适用于各种应用,包括BB84和测量设备独立的QKD (MDI-QKD).