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Related Concept Videos

Frequency-Domain Interpretation of PD Control01:24

Frequency-Domain Interpretation of PD Control

Proportional-Derivative (PD) controllers are widely used in fan control systems to improve stability and performance. A fan control system can be effectively represented using a Bode plot to illustrate the impact of a PD controller through its transfer function. The Bode plot visually conveys how PD control modifies the fan's response across various frequencies, providing a frequency domain interpretation of the controller's behavior.
The proportional control gain, combined with the system's...
Propagation of Waves01:07

Propagation of Waves

When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

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 finite,...
Time-Domain Interpretation of PD Control01:07

Time-Domain Interpretation of PD Control

Proportional-Derivative (PD) control is a widely used control method in various engineering systems to enhance stability and performance. In a system with only proportional control, common issues include high maximum overshoot and oscillation, observed in both the error signal and its rate of change. This behavior can be divided into three distinct phases: initial overshoot, subsequent undershoot, and gradual stabilization.
Consider the example of control of motor torque. Initially, a positive...
Plane Electromagnetic Waves I01:30

Plane Electromagnetic Waves I

The existence of combined electric and magnetic fields that propagate through space as electromagnetic (EM) waves is the most significant prediction of Maxwell's equations. As Maxwell's equations hold in free space, the predicted electromagnetic waves do not require a medium for their propagation. An EM wave comprises an electric field, defined as the force per charge on a stationary charge, and a magnetic field, which is the force per charge on a moving charge.
The EM field is assumed to be a...
Time and frequency -Domain Interpretation of Phase-lead Control01:24

Time and frequency -Domain Interpretation of Phase-lead Control

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...

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Related Experiment Video

Updated: Jun 24, 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

Wave-packet and coherent control dynamics.

Kenji Ohmori1

  • 1Institute for Molecular Science, National Institutes of Natural Sciences, Okazaki 444-8585, Japan. ohmori@ims.ac.jp

Annual Review of Physical Chemistry
|April 2, 2009
PubMed
Summary

This review highlights wave-packet interferometry (WPI) for controlling quantum systems using precisely timed laser pulses. WPI enables retrieval of quantum information and has future applications in complex systems and ultracold atoms.

Area of Science:

  • Quantum Control
  • Physical Chemistry
  • Quantum Information Science

Background:

  • Coherent control manipulates quantum systems using tailored electromagnetic fields.
  • Wave-packet interferometry (WPI) is a key technique within coherent control.
  • Understanding quantum dynamics requires precise control over electronic and nuclear wave packets.

Purpose of the Study:

  • To review advancements in coherent control, focusing on wave-packet interferometry (WPI).
  • To discuss WPI's utility in controlling quantum systems and retrieving quantum information.
  • To explore future applications of coherent control in advanced systems.

Main Methods:

  • Utilizing sequences of short laser pulses with finely adjusted relative phases.
  • Employing wave-packet interferometry (WPI) to control quantum system evolution.

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  • Analyzing experimental and theoretical approaches for quantum information retrieval.

    • Main Results:

    • WPI effectively controls quantum systems by managing wave packet interference.
    • WPI facilitates the retrieval of quantum information, including eigenfunction amplitudes and phases.
    • Progress in experimental and theoretical methods for quantum information extraction is detailed.

    Conclusions:

    • Wave-packet interferometry is a versatile tool for quantum control and information retrieval.
    • Coherent control offers pathways for advanced information processing using atomic and molecular eigenfunctions.
    • Future research directions include ultrafast control of ultracold matter and complex quantum systems.