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Related Concept Videos

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

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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,...

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Related Experiment Video

Updated: Jun 16, 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

Control of photon storage time using phase locking.

Byoung S Ham1

  • 1Center for Photon Information Processing, Department of Electrical Engineering, and Graduate School of Information and Telecommunications, Inha University, Incheon, South Korea. bham@inha.ac.kr

Optics Express
|February 23, 2010
PubMed
Summary
This summary is machine-generated.

Photon echo storage time is extended using a novel phase locking technique in a backward propagation scheme. This method enhances quantum memory efficiency and reduces noise by controlling population transfer.

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Quasi-light Storage for Optical Data Packets
07:45

Quasi-light Storage for Optical Data Packets

Published on: February 6, 2014

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Last Updated: Jun 16, 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

Quasi-light Storage for Optical Data Packets
07:45

Quasi-light Storage for Optical Data Packets

Published on: February 6, 2014

Area of Science:

  • Quantum optics
  • Quantum information science
  • Atomic physics

Background:

  • Photon echo techniques are crucial for quantum memories.
  • Conventional methods face challenges with low retrieval efficiency and spontaneous emission noise.
  • Backward propagation schemes offer potential solutions.

Purpose of the Study:

  • To present a photon echo storage-time extension protocol.
  • To address limitations of existing photon echo quantum memories.
  • To improve retrieval efficiency and reduce noise.

Main Methods:

  • Utilizing a three-level backward propagation scheme.
  • Implementing a phase locking method as a conditional stopper.
  • Controlling population transfer to an auxiliary spin state.

Main Results:

  • Demonstrated extension of photon echo storage time.
  • Achieved storage time extension by the spin dephasing time.
  • Numerically validated the effectiveness of the protocol.

Conclusions:

  • The presented protocol significantly enhances photon echo storage time.
  • Phase locking in backward propagation schemes is key to improved quantum memory performance.
  • This advancement offers a promising direction for robust quantum memory development.