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Interference: Path Lengths01:10

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Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
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Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
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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.
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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Controlling quantum interference in phase space with amplitude.

Yinghong Xue1,2, Tingyu Li3, Katsuyuki Kasai4

  • 1Department of Engineering Science, The University of Electro-Communications, 1-5-1 Chofugaoka, Chofu-shi, Tokyo, 182-8585, Japan.

Scientific Reports
|May 25, 2017
PubMed
Summary
This summary is machine-generated.

Researchers demonstrate quantum interference in phase space by controlling photon probabilities with light amplitude. This contrasts with classical optics, where interference is typically controlled by relative phase.

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Area of Science:

  • Quantum Optics
  • Quantum Information Science

Background:

  • Quantum states exhibit unique interference phenomena.
  • Controlling quantum interference is crucial for quantum technologies.

Purpose of the Study:

  • To experimentally demonstrate quantum interference in phase space.
  • To investigate the control of quantum interference using light amplitude.

Main Methods:

  • Generating a displaced squeezed state using an optical parametric amplifier.
  • Controlling the displacement of the quantum state with injected coherent light amplitude.
  • Measuring photon number probabilities (n=2, 3, 4).

Main Results:

  • Observed oscillations in photon number probabilities, indicating quantum interference.
  • Demonstrated that interference patterns are dependent on the amplitude of the controlling light field.
  • Showcased amplitude-controlled quantum interference in phase space.

Conclusions:

  • Quantum interference in phase space can be controlled by the amplitude of light.
  • This finding offers a new method for manipulating quantum states.
  • Highlights a key difference between quantum and classical interference control mechanisms.