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Related Concept Videos

Impulse Response01:17

Impulse Response

The impulse response is the system's reaction to an input impulse. In an RC circuit, the voltage source is the input, and the capacitor's voltage is the output. The system's state and output response before and after input excitation are distinctly defined.
Kirchhoff's law forms an input signal equation, with the capacitor's current and voltage providing the output. Substituting the current and dividing by RC yields a differential equation. The output for an impulse input is the impulse...
Frequency Response of a Circuit01:20

Frequency Response of a Circuit

Inductive circuits present intriguing challenges in electrical engineering, particularly during the transition from the time domain to the frequency domain. This transformation involves converting inductors into impedances and utilizing phasor representation.
The transfer function is pivotal in characterizing how these circuits react to various frequencies, facilitating a profound understanding of their behavior. An essential parameter is the time constant, signifying the...
First Order Systems01:21

First Order Systems

First-order systems, such as RC circuits, are foundational in understanding dynamic systems due to their straightforward input-output relationship. Analyzing their responses to different input functions under zero initial conditions reveals significant insights into system behavior.
When a first-order system is subjected to a unit-step input, its response is characterized by its transfer function. By applying the Laplace transform of the unit-step input to the transfer function, expanding the...
Transient and Steady-state Response01:24

Transient and Steady-state Response

In control systems, test signals are essential for evaluating performance under various conditions. The ramp function is effective for systems undergoing gradual changes, while the step function is suitable for assessing systems facing sudden disturbances. For systems subjected to shock inputs, the impulse function is the most appropriate test signal.
These test signals are integral in designing control systems to exhibit two key performance aspects: transient response and steady-state response.
Frequency Response of Op Amp Circuits01:20

Frequency Response of Op Amp Circuits

Operational amplifiers (op-amp) are used in signal conditioning, filtering, or for performing mathematical operations such as addition, subtraction, integration, and differentiation. The frequency response of an op-amp is an important aspect that describes how the gain of the amplifier varies with frequency.
Frequency Response and Gain:
The gain of the op-amp, A(ω), is not a constant but a function of the input signal frequency. An op-amp can maintain a constant gain at low frequencies, known...
NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

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.

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Related Experiment Video

Updated: Jun 12, 2026

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

Impulse response characterization of a quantum frequency converter.

K Alexander, M J Olszewski, M T M Woodley

    Optics Express
    |June 11, 2026
    PubMed
    Summary

    We developed a new method to measure quantum frequency conversion (QFC) system performance using classical light. This technique accurately characterizes complex QFC systems, improving quantum technology development.

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    09:23

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

    Published on: May 30, 2014

    Area of Science:

    • Quantum optics
    • Quantum information science
    • Nonlinear optics

    Background:

    • Quantum frequency conversion (QFC) is crucial for interfacing quantum systems.
    • Accurate characterization of QFC systems is essential for optimizing quantum applications.
    • Existing methods often require quantum probes, limiting practical implementation.

    Purpose of the Study:

    • To present a novel experimental method for characterizing quantum frequency conversion (QFC) systems.
    • To demonstrate a practical approach using classical probes for spectral characterization.
    • To validate the method on a fiber-based Bragg scattering four-wave mixing (BS-FWM) system.

    Main Methods:

    • Utilized classical probe measurements to retrieve cross-transfer functions of a QFC system.
    • Employed a kilometer-scale fiber Bragg-scattering four-wave-mixing (BS-FWM) converter for demonstration.
    • Incorporated longitudinal dispersion variations into a numerical model for comparison.

    Main Results:

    • Successfully retrieved the spectral transfer functions of the BS-FWM converter.
    • Observed significant departures from theoretical predictions, attributed to dispersion variations.
    • Achieved quantitative agreement between the model including dispersion and experimental data.

    Conclusions:

    • The developed method provides a practical route for characterizing complex QFC systems using classical probes.
    • Accounting for longitudinal dispersion variations is critical for accurate modeling and prediction.
    • This approach offers predictive insight for optimizing QFC systems in quantum applications.