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相关概念视频

Time and frequency -Domain Interpretation of Phase-lead Control01:24

Time and frequency -Domain Interpretation of Phase-lead Control

79
Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
79
Properties of Fourier Transform II01:24

Properties of Fourier Transform II

178
The Fourier Transform (FT) is an essential mathematical tool in signal processing, transforming a time-domain signal into its frequency-domain representation. This transformation elucidates the relationship between time and frequency domains through several properties, each revealing unique aspects of signal behavior.
The Frequency Shifting property of Fourier Transforms highlights that a shift in the frequency domain corresponds to a phase shift in the time domain. Mathematically, if x(t) has...
178
Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

714
In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
714
Propagation Speed of Electromagnetic Waves01:30

Propagation Speed of Electromagnetic Waves

3.3K
Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as:
3.3K
Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

87
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...
87
NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

772
A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
772

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相关实验视频

Updated: Jun 10, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs
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多重复合的量子频率转换.

Chao Tang, Zhaohui Ma, Zhan Li

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    概括
    此摘要是机器生成的。

    我们展示了使用单个周期极极酸波导的多重量子频率转换 (m-QFC). 这种高效的电信带向上转换保留了量子相关性,使量子通信和计算中的应用成为可能.

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    相关实验视频

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    Generation and Coherent Control of Pulsed Quantum Frequency Combs
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    Published on: June 8, 2018

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    科学领域:

    • 量子光学就是一个量子光学.
    • 非线性光学是一种非线性光学.
    • 综合光子学 综合光子学

    背景情况:

    • 多复合量子频率转换 (m-QFC) 能够同时处理多个量子信号.
    • 集成光子设备对于可扩展的量子技术至关重要.

    研究的目的:

    • 在电信频段使用单个波导来证明高效的m-QFC.
    • 为了评估m-QFC后量子相关性的保存.

    主要方法:

    • 使用一个三峰周期极化酸 (PPLN) 波导.
    • 采用单一的束,同时向上转换多个信号波长.
    • 使用多通道光子对源测试了系统.

    主要成果:

    • 在电信频段实现了高达73.6%的内部转换效率.
    • 证明了量子相关性的保存,其高巧合与偶然的比率为767.
    • 在单个PPLN波导上展示了m-QFC的可行性.

    结论:

    • 展示的m-QFC设备为量子信息处理提供了一个实用的方法.
    • 这项技术支持多重化量子密钥分布,量子传感和量子计算方面的进步.