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Related Concept Videos

Standing Waves in a Cavity01:28

Standing Waves in a Cavity

1.6K
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
1.6K
Sound Waves: Interference00:53

Sound Waves: Interference

5.0K
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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Interference and Superposition of Waves01:07

Interference and Superposition of Waves

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When two waves of the same nature occur in the same region simultaneously, they result in interference. Interference of waves implies that the net effect of the waves is the sum of the individual waves' effects. However, it does not imply that the individual waves affect the propagation of other waves.
Interference occurs in mechanical waves, such as sound waves, waves on a string, and surface water waves. Mechanical waves correspond to the physical displacement of particles. Hence,...
7.3K
Modes of Standing Waves: II01:04

Modes of Standing Waves: II

1.9K
The starting point for expressing the modes of standing waves is understanding the boundary conditions that the waves must follow. The boundary conditions are derived from the physical understanding of how the standing waves are sustained, that is, how the vibrating particles of the medium behave at the boundaries imposed on them.
For a tube open at one end and closed at the other filled with air, the modes are such that there is always an antinode at the open end and a node at the closed end....
1.9K
Interference and Diffraction02:18

Interference and Diffraction

53.0K
Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
53.0K
Interference: Path Lengths01:10

Interference: Path Lengths

2.4K
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.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...
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Related Experiment Video

Updated: Mar 8, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
12:19

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

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Quantum interference between transverse spatial waveguide modes.

Aseema Mohanty1,2, Mian Zhang1,3, Avik Dutt1,2

  • 1School of Electrical and Computer Engineering, Cornell University, Ithaca, New York 14853, USA.

Nature Communications
|January 21, 2017
PubMed
Summary
This summary is machine-generated.

Researchers demonstrate quantum interference using spatial modes in a single multi-mode waveguide. This advancement in integrated quantum optics offers a new way to encode information, paving the way for more robust quantum computing.

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Related Experiment Videos

Last Updated: Mar 8, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Area of Science:

  • Quantum optics
  • Integrated photonics
  • Quantum information processing

Background:

  • Integrated quantum optics promises smaller, more efficient quantum information processing systems.
  • Current systems primarily use path encoding, limiting the use of optical field's degrees of freedom.
  • Classical optics successfully uses transverse spatial modes in multi-mode waveguides for dense information encoding.

Purpose of the Study:

  • To explore the potential of transverse spatial modes for quantum information encoding.
  • To demonstrate quantum interference using spatial modes within a single multi-mode waveguide.
  • To advance integrated photonic quantum systems beyond path encoding.

Main Methods:

  • Utilized quantum circuit-building blocks.
  • Experimented with transverse spatial modes within a single multi-mode waveguide.
  • Demonstrated quantum interference phenomena.

Main Results:

  • Successfully achieved quantum interference between transverse spatial modes.
  • Showcased unprecedented control over spatial modes in integrated photonics.
  • Validated the potential of spatial modes for quantum information processing.

Conclusions:

  • Transverse spatial modes are a viable and powerful resource for integrated quantum information processing.
  • This technique offers a path towards more practical and robust quantum computing systems.
  • Broader utilization of optical field degrees of freedom is key for advancing quantum technologies.