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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

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,...

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Related Experiment Video

Updated: Jun 8, 2026

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

Dynamical Control of Quantum Photon-Photon Interaction with Phase Change Material.

Chaojie Wang1, Xutong Li1, Xiuyi Ma1

  • 1Xiamen University, Department of Physics, Xiamen 361005, China.

Physical Review Letters
|June 7, 2026
PubMed
Summary

Researchers harnessed vanadium dioxide

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Area of Science:

  • Quantum optics
  • Quantum information science
  • Condensed matter physics

Background:

  • Quantum interference enables advanced quantum information technologies.
  • Conventional photon-photon interactions are limited by photon nature and optical elements.
  • Loss-induced nonunitary operations offer a new control method.

Purpose of the Study:

  • To develop a novel tool for controlling quantum interference.
  • To explore photon-photon interactions beyond classical limitations.
  • To demonstrate dynamical control of quantum interference using phase change materials.

Main Methods:

  • Utilizing the insulator-metal transition of vanadium dioxide (VO2).
  • Fabricating an elaborate VO2 thin film.
  • Experimentally demonstrating the control of quantum interference.

Main Results:

  • Vanadium dioxide thin films enable tunable particle exchange phase responses.
  • Dynamical control of photon-photon interactions, including coalescence and anti-coalescence, was achieved.
  • The proposed tool effectively unravels essential features of quantum interference.

Conclusions:

  • Harnessing VO2 phase transitions offers a new approach for quantum light-matter interactions.
  • This method facilitates nonunitary quantum interference for quantum information processing.
  • The study provides a concise and powerful tool for controlling quantum interference.